rev: 08a0786d94a50b3b229836c53a03976f10ab6bd7 scopes/lib/scopes/core.sc -rw-r--r-- 293.1 KiB View raw Log this file
08a0786d94a5Shawn Walker-Salas * drop number sections in menu due to readthedocs theme incompatibility 17 days ago
                                                                                
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836
5837
5838
5839
5840
5841
5842
5843
5844
5845
5846
5847
5848
5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
5865
5866
5867
5868
5869
5870
5871
5872
5873
5874
5875
5876
5877
5878
5879
5880
5881
5882
5883
5884
5885
5886
5887
5888
5889
5890
5891
5892
5893
5894
5895
5896
5897
5898
5899
5900
5901
5902
5903
5904
5905
5906
5907
5908
5909
5910
5911
5912
5913
5914
5915
5916
5917
5918
5919
5920
5921
5922
5923
5924
5925
5926
5927
5928
5929
5930
5931
5932
5933
5934
5935
5936
5937
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958
5959
5960
5961
5962
5963
5964
5965
5966
5967
5968
5969
5970
5971
5972
5973
5974
5975
5976
5977
5978
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988
5989
5990
5991
5992
5993
5994
5995
5996
5997
5998
5999
6000
6001
6002
6003
6004
6005
6006
6007
6008
6009
6010
6011
6012
6013
6014
6015
6016
6017
6018
6019
6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
6043
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057
6058
6059
6060
6061
6062
6063
6064
6065
6066
6067
6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
6089
6090
6091
6092
6093
6094
6095
6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
6128
6129
6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
6143
6144
6145
6146
6147
6148
6149
6150
6151
6152
6153
6154
6155
6156
6157
6158
6159
6160
6161
6162
6163
6164
6165
6166
6167
6168
6169
6170
6171
6172
6173
6174
6175
6176
6177
6178
6179
6180
6181
6182
6183
6184
6185
6186
6187
6188
6189
6190
6191
6192
6193
6194
6195
6196
6197
6198
6199
6200
6201
6202
6203
6204
6205
6206
6207
6208
6209
6210
6211
6212
6213
6214
6215
6216
6217
6218
6219
6220
6221
6222
6223
6224
6225
6226
6227
6228
6229
6230
6231
6232
6233
6234
6235
6236
6237
6238
6239
6240
6241
6242
6243
6244
6245
6246
6247
6248
6249
6250
6251
6252
6253
6254
6255
6256
6257
6258
6259
6260
6261
6262
6263
6264
6265
6266
6267
6268
6269
6270
6271
6272
6273
6274
6275
6276
6277
6278
6279
6280
6281
6282
6283
6284
6285
6286
6287
6288
6289
6290
6291
6292
6293
6294
6295
6296
6297
6298
6299
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312
6313
6314
6315
6316
6317
6318
6319
6320
6321
6322
6323
6324
6325
6326
6327
6328
6329
6330
6331
6332
6333
6334
6335
6336
6337
6338
6339
6340
6341
6342
6343
6344
6345
6346
6347
6348
6349
6350
6351
6352
6353
6354
6355
6356
6357
6358
6359
6360
6361
6362
6363
6364
6365
6366
6367
6368
6369
6370
6371
6372
6373
6374
6375
6376
6377
6378
6379
6380
6381
6382
6383
6384
6385
6386
6387
6388
6389
6390
6391
6392
6393
6394
6395
6396
6397
6398
6399
6400
6401
6402
6403
6404
6405
6406
6407
6408
6409
6410
6411
6412
6413
6414
6415
6416
6417
6418
6419
6420
6421
6422
6423
6424
6425
6426
6427
6428
6429
6430
6431
6432
6433
6434
6435
6436
6437
6438
6439
6440
6441
6442
6443
6444
6445
6446
6447
6448
6449
6450
6451
6452
6453
6454
6455
6456
6457
6458
6459
6460
6461
6462
6463
6464
6465
6466
6467
6468
6469
6470
6471
6472
6473
6474
6475
6476
6477
6478
6479
6480
6481
6482
6483
6484
6485
6486
6487
6488
6489
6490
6491
6492
6493
6494
6495
6496
6497
6498
6499
6500
6501
6502
6503
6504
6505
6506
6507
6508
6509
6510
6511
6512
6513
6514
6515
6516
6517
6518
6519
6520
6521
6522
6523
6524
6525
6526
6527
6528
6529
6530
6531
6532
6533
6534
6535
6536
6537
6538
6539
6540
6541
6542
6543
6544
6545
6546
6547
6548
6549
6550
6551
6552
6553
6554
6555
6556
6557
6558
6559
6560
6561
6562
6563
6564
6565
6566
6567
6568
6569
6570
6571
6572
6573
6574
6575
6576
6577
6578
6579
6580
6581
6582
6583
6584
6585
6586
6587
6588
6589
6590
6591
6592
6593
6594
6595
6596
6597
6598
6599
6600
6601
6602
6603
6604
6605
6606
6607
6608
6609
6610
6611
6612
6613
6614
6615
6616
6617
6618
6619
6620
6621
6622
6623
6624
6625
6626
6627
6628
6629
6630
6631
6632
6633
6634
6635
6636
6637
6638
6639
6640
6641
6642
6643
6644
6645
6646
6647
6648
6649
6650
6651
6652
6653
6654
6655
6656
6657
6658
6659
6660
6661
6662
6663
6664
6665
6666
6667
6668
6669
6670
6671
6672
6673
6674
6675
6676
6677
6678
6679
6680
6681
6682
6683
6684
6685
6686
6687
6688
6689
6690
6691
6692
6693
6694
6695
6696
6697
6698
6699
6700
6701
6702
6703
6704
6705
6706
6707
6708
6709
6710
6711
6712
6713
6714
6715
6716
6717
6718
6719
6720
6721
6722
6723
6724
6725
6726
6727
6728
6729
6730
6731
6732
6733
6734
6735
6736
6737
6738
6739
6740
6741
6742
6743
6744
6745
6746
6747
6748
6749
6750
6751
6752
6753
6754
6755
6756
6757
6758
6759
6760
6761
6762
6763
6764
6765
6766
6767
6768
6769
6770
6771
6772
6773
6774
6775
6776
6777
6778
6779
6780
6781
6782
6783
6784
6785
6786
6787
6788
6789
6790
6791
6792
6793
6794
6795
6796
6797
6798
6799
6800
6801
6802
6803
6804
6805
6806
6807
6808
6809
6810
6811
6812
6813
6814
6815
6816
6817
6818
6819
6820
6821
6822
6823
6824
6825
6826
6827
6828
6829
6830
6831
6832
6833
6834
6835
6836
6837
6838
6839
6840
6841
6842
6843
6844
6845
6846
6847
6848
6849
6850
6851
6852
6853
6854
6855
6856
6857
6858
6859
6860
6861
6862
6863
6864
6865
6866
6867
6868
6869
6870
6871
6872
6873
6874
6875
6876
6877
6878
6879
6880
6881
6882
6883
6884
6885
6886
6887
6888
6889
6890
6891
6892
6893
6894
6895
6896
6897
6898
6899
6900
6901
6902
6903
6904
6905
6906
6907
6908
6909
6910
6911
6912
6913
6914
6915
6916
6917
6918
6919
6920
6921
6922
6923
6924
6925
6926
6927
6928
6929
6930
6931
6932
6933
6934
6935
6936
6937
6938
6939
6940
6941
6942
6943
6944
6945
6946
6947
6948
6949
6950
6951
6952
6953
6954
6955
6956
6957
6958
6959
6960
6961
6962
6963
6964
6965
6966
6967
6968
6969
6970
6971
6972
6973
6974
6975
6976
6977
6978
6979
6980
6981
6982
6983
6984
6985
6986
6987
6988
6989
6990
6991
6992
6993
6994
6995
6996
6997
6998
6999
7000
7001
7002
7003
7004
7005
7006
7007
7008
7009
7010
7011
7012
7013
7014
7015
7016
7017
7018
7019
7020
7021
7022
7023
7024
7025
7026
7027
7028
7029
7030
7031
7032
7033
7034
7035
7036
7037
7038
7039
7040
7041
7042
7043
7044
7045
7046
7047
7048
7049
7050
7051
7052
7053
7054
7055
7056
7057
7058
7059
7060
7061
7062
7063
7064
7065
7066
7067
7068
7069
7070
7071
7072
7073
7074
7075
7076
7077
7078
7079
7080
7081
7082
7083
7084
7085
7086
7087
7088
7089
7090
7091
7092
7093
7094
7095
7096
7097
7098
7099
7100
7101
7102
7103
7104
7105
7106
7107
7108
7109
7110
7111
7112
7113
7114
7115
7116
7117
7118
7119
7120
7121
7122
7123
7124
7125
7126
7127
7128
7129
7130
7131
7132
7133
7134
7135
7136
7137
7138
7139
7140
7141
7142
7143
7144
7145
7146
7147
7148
7149
7150
7151
7152
7153
7154
7155
7156
7157
7158
7159
7160
7161
7162
7163
7164
7165
7166
7167
7168
7169
7170
7171
7172
7173
7174
7175
7176
7177
7178
7179
7180
7181
7182
7183
7184
7185
7186
7187
7188
7189
7190
7191
7192
7193
7194
7195
7196
7197
7198
7199
7200
7201
7202
7203
7204
7205
7206
7207
7208
7209
7210
7211
7212
7213
7214
7215
7216
7217
7218
7219
7220
7221
7222
7223
7224
7225
7226
7227
7228
7229
7230
7231
7232
7233
7234
7235
7236
7237
7238
7239
7240
7241
7242
7243
7244
7245
7246
7247
7248
7249
7250
7251
7252
7253
7254
7255
7256
7257
7258
7259
7260
7261
7262
7263
7264
7265
7266
7267
7268
7269
7270
7271
7272
7273
7274
7275
7276
7277
7278
7279
7280
7281
7282
7283
7284
7285
7286
7287
7288
7289
7290
7291
7292
7293
7294
7295
7296
7297
7298
7299
7300
7301
7302
7303
7304
7305
7306
7307
7308
7309
7310
7311
7312
7313
7314
7315
7316
7317
7318
7319
7320
7321
7322
7323
7324
7325
7326
7327
7328
7329
7330
7331
7332
7333
7334
7335
7336
7337
7338
7339
7340
7341
7342
7343
7344
7345
7346
7347
7348
7349
7350
7351
7352
7353
7354
7355
7356
7357
7358
7359
7360
7361
7362
7363
7364
7365
7366
7367
7368
7369
7370
7371
7372
7373
7374
7375
7376
7377
7378
7379
7380
7381
7382
7383
7384
7385
7386
7387
7388
7389
7390
7391
7392
7393
7394
7395
7396
7397
7398
7399
7400
7401
7402
7403
7404
7405
7406
7407
7408
7409
7410
7411
7412
7413
7414
7415
7416
7417
7418
7419
7420
7421
7422
7423
7424
7425
7426
7427
7428
7429
7430
7431
7432
7433
7434
7435
7436
7437
7438
7439
7440
7441
7442
7443
7444
7445
7446
7447
7448
7449
7450
7451
7452
7453
7454
7455
7456
7457
7458
7459
7460
7461
7462
7463
7464
7465
7466
7467
7468
7469
7470
7471
7472
7473
7474
7475
7476
7477
7478
7479
7480
7481
7482
7483
7484
7485
7486
7487
7488
7489
7490
7491
7492
7493
7494
7495
7496
7497
7498
7499
7500
7501
7502
7503
7504
7505
7506
7507
7508
7509
7510
7511
7512
7513
7514
7515
7516
7517
7518
7519
7520
7521
7522
7523
7524
7525
7526
7527
7528
7529
7530
7531
7532
7533
7534
7535
7536
7537
7538
7539
7540
7541
7542
7543
7544
7545
7546
7547
7548
7549
7550
7551
7552
7553
7554
7555
7556
7557
7558
7559
7560
7561
7562
7563
7564
7565
7566
7567
7568
7569
7570
7571
7572
7573
7574
7575
7576
7577
7578
7579
7580
7581
7582
7583
7584
7585
7586
7587
7588
7589
7590
7591
7592
7593
7594
7595
7596
7597
7598
7599
7600
7601
7602
7603
7604
7605
7606
7607
7608
7609
7610
7611
7612
7613
7614
7615
7616
7617
7618
7619
7620
7621
7622
7623
7624
7625
7626
7627
7628
7629
7630
7631
7632
7633
7634
7635
7636
7637
7638
7639
7640
7641
7642
7643
7644
7645
7646
7647
7648
7649
7650
7651
7652
7653
7654
7655
7656
7657
7658
7659
7660
7661
7662
7663
7664
7665
7666
7667
7668
7669
7670
7671
7672
7673
7674
7675
7676
7677
7678
7679
7680
7681
7682
7683
7684
7685
7686
7687
7688
7689
7690
7691
7692
7693
7694
7695
7696
7697
7698
7699
7700
7701
7702
7703
7704
7705
7706
7707
7708
7709
7710
7711
7712
7713
7714
7715
7716
7717
7718
7719
7720
7721
7722
7723
7724
7725
7726
7727
7728
7729
7730
7731
7732
7733
7734
7735
7736
7737
7738
7739
7740
7741
7742
7743
7744
7745
7746
7747
7748
7749
7750
7751
7752
7753
7754
7755
7756
7757
7758
7759
7760
7761
7762
7763
7764
7765
7766
7767
7768
7769
7770
7771
7772
7773
7774
7775
7776
7777
7778
7779
7780
7781
7782
7783
7784
7785
7786
7787
7788
7789
7790
7791
7792
7793
7794
7795
7796
7797
7798
7799
7800
7801
7802
7803
7804
7805
7806
7807
7808
7809
7810
7811
7812
7813
7814
7815
7816
7817
7818
7819
7820
7821
7822
7823
7824
7825
7826
7827
7828
7829
7830
7831
7832
7833
7834
7835
7836
7837
7838
7839
7840
7841
7842
7843
7844
7845
7846
7847
7848
7849
7850
7851
7852
7853
7854
7855
7856
7857
7858
7859
7860
7861
7862
7863
7864
7865
7866
7867
7868
7869
7870
7871
7872
7873
7874
7875
7876
7877
7878
7879
7880
7881
7882
7883
7884
7885
7886
7887
7888
7889
7890
7891
7892
7893
7894
7895
7896
7897
7898
7899
7900
7901
7902
7903
7904
7905
7906
7907
7908
7909
7910
7911
7912
7913
7914
7915
7916
7917
7918
7919
7920
7921
7922
7923
7924
7925
7926
7927
7928
7929
7930
7931
7932
7933
7934
7935
7936
7937
7938
7939
7940
7941
7942
7943
7944
7945
7946
7947
7948
7949
7950
7951
7952
7953
7954
7955
7956
7957
7958
7959
7960
7961
7962
7963
7964
7965
7966
7967
7968
7969
7970
7971
7972
7973
7974
7975
7976
7977
7978
7979
7980
7981
7982
7983
7984
7985
7986
7987
7988
7989
7990
7991
7992
7993
7994
7995
7996
7997
7998
7999
8000
8001
8002
8003
8004
8005
8006
8007
8008
8009
8010
8011
8012
8013
8014
8015
8016
8017
8018
8019
8020
8021
8022
8023
8024
8025
8026
8027
8028
8029
8030
8031
8032
8033
8034
8035
8036
8037
8038
8039
8040
8041
8042
8043
8044
8045
8046
8047
8048
8049
8050
8051
8052
8053
8054
8055
8056
8057
8058
8059
8060
8061
8062
8063
8064
8065
8066
8067
8068
8069
8070
8071
8072
8073
8074
8075
8076
8077
8078
8079
8080
8081
8082
8083
8084
8085
8086
8087
8088
8089
8090
8091
8092
8093
8094
8095
8096
8097
8098
8099
8100
8101
8102
8103
8104
8105
8106
8107
8108
8109
8110
8111
8112
8113
8114
8115
8116
8117
8118
8119
8120
8121
8122
8123
8124
8125
8126
8127
8128
8129
8130
8131
8132
8133
8134
8135
8136
8137
8138
8139
8140
8141
8142
8143
8144
8145
8146
8147
8148
8149
8150
8151
8152
8153
8154
8155
8156
8157
8158
8159
8160
8161
8162
8163
8164
8165
8166
8167
8168
8169
8170
8171
#
    The Scopes Compiler Infrastructure
    This file is distributed under the MIT License.
    See LICENSE.md for details.

""""globals
    =======

    These names are bound in every fresh module and main program by default.
    Essential symbols are created by the compiler, and subsequent utility
    functions, macros and types are defined and documented in `core.sc`.

    The core module implements the remaining standard functions and macros,
    parses the command-line and optionally enters the REPL.

""""A string containing the folder path to the compiler environment. Typically
    the compiler environment is the folder that contains the `bin` folder
    containing the compiler executable.
let compiler-dir
""""A string constant containing the file path to the compiler executable.
let compiler-path
""""A string constant indicating the time and date the compiler was built.
let compiler-timestamp
""""A boolean constant indicating if the compiler was built in debug mode.
let debug-build?
""""A string constant indicating the operating system the compiler was built
    for. It is equal to `"linux"` for Linux builds, `"windows"` for Windows
    builds, `"macos"` for macOS builds and `"unknown"` otherwise.
let operating-system
""""A constant of type `i32` indicating the maximum number of recursions
    permitted for an inline. When this number is exceeded, an error is raised
    during typechecking. Currently, the limit is set at 64 recursions. This
    restriction has been put in place to prevent the compiler from overflowing
    its stack memory.
let unroll-limit

let default-target-triple = (sc_default_target_triple)

# square list expressions are ast unquotes by default
let square-list = spice-unquote-arguments

# first we alias u64 to the integer type that can hold a pointer
let intptr = u64

inline swap (a b)
    """"Safely exchanges the contents of two references.
    let tmp = (deref (dupe b))
    assign (dupe a) b
    assign tmp a
    ;

# pointer comparison as a template function, because we'll compare pointers of many types
fn ptrcmp!= (t1 t2)
    icmp!= (ptrtoint t1 intptr) (ptrtoint t2 intptr)

fn ptrcmp== (t1 t2)
    icmp== (ptrtoint t1 intptr) (ptrtoint t2 intptr)

fn box-integer (value)
    let T = (typeof value)
    sc_const_int_new T
        if (sc_integer_type_is_signed T)
            sext value u64
        else
            zext value u64

# turn a symbol-like value (storage type u64) to an Any
fn box-symbol (value)
    sc_const_int_new (typeof value)
        bitcast value u64

# turn a pointer value into an Any
fn box-pointer (value)
    sc_const_pointer_new (typeof value)
        bitcast value voidstar

fn error (msg)
    hide-traceback;
    raise (sc_error_new msg)

fn error@ (anchor traceback-msg error-msg)
    """"Usage example:

            :::scopes
            error@ ('anchor value) "while checking parameter" "error in value"
    hide-traceback;
    let err = (sc_error_new error-msg)
    sc_error_append_calltrace err (sc_valueref_tag anchor `traceback-msg)
    raise err

fn error@+ (error anchor traceback-msg)
    """"Usage example:

            :::scopes
            except (err)
                error@+ err ('anchor value) "while processing stream"
    hide-traceback;
    sc_error_append_calltrace error (sc_valueref_tag anchor `traceback-msg)
    raise error

# print an unboxing error given two types
fn unbox-verify (value wantT)
    let haveT = (sc_value_type value)
    if (ptrcmp!= haveT wantT)
        hide-traceback;
        error@
            sc_value_anchor value
            "while trying to unbox value"
            sc_string_join "can't unbox value of type "
                sc_string_join
                    sc_value_repr (box-pointer haveT)
                    sc_string_join " as value of type "
                        sc_value_repr (box-pointer wantT)
    if (sc_value_is_constant value)
    else
        hide-traceback;
        error@
            sc_value_anchor value
            "while trying to unbox value"
            sc_string_join "constant of type "
                sc_string_join
                    sc_value_repr (box-pointer haveT)
                    sc_string_join " expected, got expression of type "
                        sc_value_repr (box-pointer wantT)

inline unbox-integer (value T)
    unbox-verify value T
    itrunc (sc_const_int_extract value) T

inline unbox-symbol (value T)
    unbox-verify value T
    bitcast (sc_const_int_extract value) T

inline unbox-pointer (value T)
    unbox-verify value T
    bitcast (sc_const_pointer_extract value) T

fn verify-count (count mincount maxcount)
    if (icmp>=s mincount 0)
        if (icmp<s count mincount)
            error
                sc_string_join "at least "
                    sc_string_join (sc_value_repr (box-integer mincount))
                        sc_string_join " argument(s) expected, got "
                            sc_value_repr (box-integer count)
    if (icmp>=s maxcount 0)
        if (icmp>s count maxcount)
            error
                sc_string_join "at most "
                    sc_string_join (sc_value_repr (box-integer maxcount))
                        sc_string_join " argument(s) expected, got "
                            sc_value_repr (box-integer count)

fn Value-none? (value)
    ptrcmp== (sc_value_type value) Nothing

# declare new pointer types at runtime
let TypeArrayPointer =
    sc_pointer_type type pointer-flag-non-writable unnamed
let ValueArrayPointer =
    sc_pointer_type Value pointer-flag-non-writable unnamed
let SpiceMacroFunction = (sc_type_storage SpiceMacro)
# dynamically construct a new symbol
let
    ellipsis-symbol = (sc_symbol_new "...")
    list-handler-symbol = (sc_symbol_new "#list")
    symbol-handler-symbol = (sc_symbol_new "#symbol")
    typed-symbol-handler-symbol = (sc_symbol_new "#typed-symbol")

# execute until here and treat the remainder as a new translation unit
run-stage; # 1

# we can now access TypeArrayPointer as a compile time value
let void =
    sc_arguments_type 0 (nullof TypeArrayPointer)

fn build-typify-function (f)
    let types = (alloca-array type 1:usize)
    store Value (getelementptr types 0)
    let types = (bitcast types TypeArrayPointer)
    let result = (sc_compile (sc_typify f 1 types) compile-flag-cache)
    let result-type = (sc_value_type result)
    if (ptrcmp!= result-type SpiceMacroFunction)
        error
            sc_string_join "spice macro must have type "
                sc_string_join
                    sc_value_repr (box-pointer SpiceMacroFunction)
                    sc_string_join " but has type "
                        sc_value_repr (box-pointer result-type)
    let ptr = (sc_const_pointer_extract result)
    bitcast ptr SpiceMacro

let typify =
    do
        fn typify (args)
            let argcount = (sc_argcount args)
            verify-count argcount 1 -1
            let src_fn = (sc_getarg args 0)
            let typecount = (sub argcount 1)
            spice-quote
                let types = (alloca-array type typecount)
                spice-unquote
                    let body = (sc_expression_new)
                    loop (i j = 1 0)
                        if (icmp== i argcount)
                            break;
                        let ty = (sc_getarg args i)
                        if (ptrcmp!= (sc_value_type ty) type)
                            error "type expected"
                        sc_expression_append body
                            `(store ty (getelementptr types j))
                        _ (add i 1) (add j 1)
                    body
                sc_typify src_fn typecount (bitcast types TypeArrayPointer)

        build-typify-function typify

let static-typify =
    do
        fn static-typify (args)
            let argcount = (sc_argcount args)
            verify-count argcount 1 -1
            let src_fn = (sc_getarg args 0)
            let src_fn = (unbox-pointer src_fn Closure)
            let typecount = (sub argcount 1)
            let types = (alloca-array type typecount)
            loop (i j = 1 0)
                if (icmp== i argcount)
                    break;
                let ty = (sc_getarg args i)
                store (unbox-pointer ty type) (getelementptr types j)
                _ (add i 1) (add j 1)
            sc_typify src_fn typecount (bitcast types TypeArrayPointer)

        build-typify-function static-typify

run-stage; # 2

let spice-macro-verify-signature =
    static-typify (fn "spice-macro-verify-signature" (f)) SpiceMacroFunction

inline function->SpiceMacro (f)
    spice-macro-verify-signature f
    bitcast f SpiceMacro

# take closure l, typify and compile it and return a function of SpiceMacro type
inline spice-macro (l)
    function->SpiceMacro (static-typify l Value)

inline box-spice-macro (l)
    sc_valueref_tag
        sc_value_anchor `l
        box-pointer (spice-macro l)

let va-lfold va-lifold =
    do
        fn va-lfold (args use-indices)
            let argcount = (sc_argcount args)
            verify-count argcount 2 -1
            let init = (sc_getarg args 0)
            let f = (sc_getarg args 1)
            if (icmp== argcount 2)
                return init
            let ofs = (? use-indices 1 0)
            let anchor = (sc_value_anchor args)
            loop (i ret = 2 init)
                if (icmp== i argcount)
                    break ret
                let arg =
                    sc_getarg args i
                let k = (sc_type_key (sc_value_qualified_type arg))
                let v = (sc_keyed_new unnamed arg)
                _ (add i 1)
                    if use-indices
                        sc_valueref_tag anchor `(f [(sub i 2)] k v ret)
                    else
                        sc_valueref_tag anchor `(f k v ret)
        _
            spice-macro (fn "va-lfold" (args) (va-lfold args false))
            spice-macro (fn "va-lifold" (args) (va-lfold args true))

let va-rfold va-rifold =
    do
        fn va-rfold (args use-indices)
            let argcount = (sc_argcount args)
            verify-count argcount 2 -1
            let init = (sc_getarg args 0)
            let f = (sc_getarg args 1)
            if (icmp== argcount 2)
                return init
            let ofs = (? use-indices 1 0)
            loop (i ret = argcount init)
                if (icmp<=s i 2)
                    break ret
                let oi = i
                let i = (sub i 1)
                let arg =
                    sc_getarg args i
                let k = (sc_type_key (sc_value_qualified_type arg))
                let v = (sc_valueref_tag
                    (sc_value_anchor arg) (sc_keyed_new unnamed arg))
                _ i
                    sc_valueref_tag
                        sc_value_anchor arg
                        if use-indices
                            `(f [(sub i 2)] k v ret)
                        else
                            `(f k v ret)
        _
            spice-macro (fn "va-rfold" (args) (va-rfold args false))
            spice-macro (fn "va-rifold" (args) (va-rfold args true))

fn type< (T superT)
    sc_type_is_superof superT T

fn type> (superT T)
    sc_type_is_superof superT T

fn type<= (T superT)
    bor (type< T superT) (ptrcmp== T superT)

fn type>= (superT T)
    bor (type< T superT) (ptrcmp== T superT)

fn compare-type (args f)
    let argcount = (sc_argcount args)
    verify-count argcount 2 2
    let a = (sc_getarg args 0)
    let b = (sc_getarg args 1)
    if (sc_value_is_constant a)
        if (sc_value_is_constant b)
            return
                box-integer
                    f (unbox-pointer a type) (unbox-pointer b type)
    `(f args)

inline type-comparison-func (f)
    fn (args) (compare-type args (static-typify f type type))

let static-error =
    box-spice-macro
        fn "static-error" (args)
            returning Value
            let argcount = (sc_argcount args)
            verify-count argcount 1 1
            let msg = (sc_getarg args 0)
            let msg = (unbox-pointer msg string)
            hide-traceback;
            raise (sc_error_new msg)

let elementof =
    box-spice-macro
        fn "elementof" (args)
            let argcount = (sc_argcount args)
            verify-count argcount 1 2
            let self = (unbox-pointer (sc_getarg args 0) type)
            let index =
                if (icmp== argcount 2)
                    let arg = (sc_getarg args 1)
                    if (ptrcmp== (sc_value_type arg) Symbol)
                        let sym = (unbox-integer arg Symbol)
                        sc_type_field_index self sym
                    else
                        unbox-integer arg i32
                else 0
            hide-traceback;
            `[(sc_type_element_at self index)]

inline sc_argument_list_map_new (N mapf)
    let values = (alloca-array Value N)
    loop (i = 0)
        if (icmp== i N)
            break;
        store (sc_identity (mapf i)) (getelementptr values i)
        add i 1
    sc_argument_list_new N values

inline sc_argument_list_map_filter_new (maxN mapf)
    let values = (alloca-array Value maxN)
    loop (i k = 0 0)
        if (icmp== i maxN)
            break
                sc_argument_list_new k values
        let ok value = (mapf i)
        if ok
            store (sc_identity value) (getelementptr values k)
            repeat (add i 1) (add k 1)
        else
            repeat (add i 1) k

fn sc_argument_list_join (a b)
    let A = (sc_argcount a)
    let B = (sc_argcount b)
    let N = (add A B)
    let values = (alloca-array Value N)
    loop (i = 0)
        if (icmp== i A)
            break;
        store (sc_getarg a i) (getelementptr values i)
        add i 1
    loop (i = A)
        if (icmp== i N)
            break;
        store (sc_getarg b (sub i A)) (getelementptr values i)
        add i 1
    sc_argument_list_new N values

let argumentsof =
    box-spice-macro
        fn "argumentsof" (args)
            let argcount = (sc_argcount args)
            verify-count argcount 1 1
            let self = (unbox-pointer (sc_getarg args 0) type)
            hide-traceback;
            let count = (sc_arguments_type_argcount self)
            sc_argument_list_map_new count
                inline (i)
                    `[(sc_arguments_type_getarg self i)]

let elementsof =
    box-spice-macro
        fn "elementsof" (args)
            let argcount = (sc_argcount args)
            verify-count argcount 1 1
            let self = (unbox-pointer (sc_getarg args 0) type)
            hide-traceback;
            let count = (sc_type_countof self)
            sc_argument_list_map_new count
                inline (i)
                    `[(sc_type_element_at self i)]

let locationof =
    box-spice-macro
        fn "locationof" (args)
            let argcount = (sc_argcount args)
            verify-count argcount 1 1
            let self = (sc_getarg args 0)
            `[(sc_global_location self)]

let bindingof =
    box-spice-macro
        fn "locationof" (args)
            let argcount = (sc_argcount args)
            verify-count argcount 1 1
            let self = (sc_getarg args 0)
            `[(sc_global_binding self)]

let storagecast =
    box-spice-macro
        fn "storagecast" (args)
            let argcount = (sc_argcount args)
            verify-count argcount 1 1
            let self = (sc_getarg args 0)
            let T = (sc_type_storage (sc_value_type self))
            return (sc_valueref_tag (sc_value_anchor args) `(bitcast self T))

""""*spice*{.property} `&?`{.descname} (*&ensp;value&ensp;*)[](#scopes.spice.&? "Permalink to this definition"){.headerlink} {#scopes.Generator.spice.&?}

    :   Returns `true` if `value` is a reference, otherwise `false`.
let &? =
    box-spice-macro
        fn "&?" (args)
            let argcount = (sc_argcount args)
            verify-count argcount 1 1
            let self = (sc_getarg args 0)
            let selfT =
                if (band
                        (ptrcmp== (sc_value_type self) type)
                        (sc_value_is_constant self))
                    unbox-pointer self type
                else (sc_value_qualified_type self)
            let isref = (sc_type_is_refer selfT)
            `isref

# typecall
sc_type_set_symbol type '__call
    box-spice-macro
        fn "type-call" (args)
            let argcount = (sc_argcount args)
            verify-count argcount 1 -1
            let self = (sc_getarg args 0)
            let T = (unbox-pointer self type)
            let f = (sc_type_at T '__typecall)
            return (sc_valueref_tag (sc_value_anchor args) `(f args))

# methodcall
sc_type_set_symbol Symbol '__call
    box-spice-macro
        fn "symbol-call" (args)
            hide-traceback;
            let argcount = (sc_argcount args)
            verify-count argcount 2 -1
            let self = (sc_getarg args 1)
            let T = (sc_value_type self)
            let f = (sc_type_at T '__methodcall)
            sc_valueref_tag (sc_value_anchor args) `(f args)

# methodcall for any type
sc_type_set_symbol typename '__methodcall
    box-spice-macro
        fn "typename-methodcall" (args)
            hide-traceback;

            fn resolve-method (self symval)
                hide-traceback;
                let sym = (unbox-symbol symval Symbol)
                let T = (sc_value_type self)
                try (return (sc_type_at T sym))
                except (err)
                    # if calling method of type, try typemethod
                    if (ptrcmp== T type)
                        if (sc_value_is_constant self)
                            let self = (unbox-pointer self type)
                            return (sc_type_at self sym)
                    raise err

            let argcount = (sc_argcount args)
            verify-count argcount 2 -1
            let symval = (sc_getarg args 0)
            let self = (sc_getarg args 1)
            let method = (resolve-method self symval)
            let arglist = (sc_extract_argument_list_new args 1)
            sc_valueref_tag (sc_value_anchor args) `(method arglist)

do
    fn get-key-value-args (args)
        let argcount = (sc_argcount args)
        verify-count argcount 2 3
        let self = (sc_getarg args 0)
        if (icmp== argcount 3)
            let key = (sc_getarg args 1)
            if (sc_value_is_constant key)
                if (icmp== (unbox-symbol key Symbol) unnamed)
                    hide-traceback;
                    error "value is missing key"
            let value = (sc_getarg args 2)
            return self key value
        else
            let arg = (sc_getarg args 1)
            let key = (sc_type_key (sc_value_qualified_type arg))
            if (icmp== key unnamed)
                hide-traceback;
                error "value is missing key"
            let arg = (sc_keyed_new unnamed arg)
            return self (box-symbol key) arg

    inline gen-key-type-set (selftype fset)
        box-spice-macro
            fn "set-symbol" (args)
                hide-traceback;
                let self key value = (get-key-value-args args)
                `(fset self key value)

    inline gen-key-type-define (selftype fset)
        box-spice-macro
            fn "define-symbol" (args)
                let self key value = (get-key-value-args args)
                if (sc_value_is_constant self)
                    if (sc_value_is_constant key)
                        if (sc_value_is_pure value)
                            let self = (unbox-pointer self selftype)
                            let key = (unbox-symbol key Symbol)
                            fset self key value
                            return `()
                error "all arguments must be constant"

    fn get-key-value-scope-args (args)
        let argcount = (sc_argcount args)
        verify-count argcount 2 3
        let self = (sc_getarg args 0)
        if (icmp== argcount 3)
            let key = (sc_getarg args 1)
            let value = (sc_getarg args 2)
            return self key value
        else
            let arg = (sc_getarg args 1)
            let key = (sc_type_key (sc_value_qualified_type arg))
            if (icmp== key unnamed)
                hide-traceback;
                error "value is missing key"
            let arg = (sc_keyed_new unnamed arg)
            return self (box-symbol key) arg

    inline gen-key-scope-set (selftype fset)
        box-spice-macro
            fn "set-symbol" (args)
                hide-traceback;
                let self key value = (get-key-value-scope-args args)
                `(fset self `key value)

    inline gen-key-scope-define (selftype fset)
        box-spice-macro
            fn "define-symbol" (args)
                let self key value = (get-key-value-scope-args args)
                if (sc_value_is_constant self)
                    if (sc_value_is_constant key)
                        if (sc_value_is_pure value)
                            let self = (unbox-pointer self selftype)
                            let result = (fset self key value)
                            return `result
                        else
                            error "value argument must be constant"
                    else
                        error "key argument must be constant"
                else
                    error "scope must be constant"

    # quick assignment of type attributes
    sc_type_set_symbol type 'set-symbol (gen-key-type-set type sc_type_set_symbol)
    sc_type_set_symbol type 'define-symbol (gen-key-type-define type sc_type_set_symbol)
    sc_type_set_symbol Scope 'bind (gen-key-scope-set Scope sc_scope_bind)
    sc_type_set_symbol Scope 'define (gen-key-scope-define Scope sc_scope_bind)

# static pointer type constructor
sc_type_set_symbol pointer '__typecall
    box-spice-macro
        fn "pointer.__typecall" (args)
            let argcount = (sc_argcount args)
            verify-count argcount 1 2
            let cls = (sc_getarg args 0)
            if (ptrcmp== (unbox-pointer cls type) pointer)
                verify-count argcount 2 2
                let self = (sc_getarg args 1)
                let T = (unbox-pointer self type)
                `[(sc_pointer_type T pointer-flag-non-writable unnamed)]
            else
                # default constructor
                `(nullof cls)

# dynamic pointer type constructor
sc_type_set_symbol pointer 'type
    box-pointer
        inline "pointer.type" (T)
            sc_pointer_type T pointer-flag-non-writable unnamed

inline aggregate-type-constructor (start f)
    box-spice-macro
        fn "aggregate-type-constructor" (args)
            let argcount = (sc_argcount args)
            verify-count argcount start -1
            let pcount = (sub argcount start)
            let types = (alloca-array type pcount)
            loop (i = start)
                if (icmp== i argcount)
                    break;
                let arg = (sc_getarg args i)
                let k = (sc_type_key (sc_value_qualified_type arg))
                let arg = (unbox-pointer arg type)
                store (sc_key_type k arg)
                    getelementptr types (sub i start)
                add i 1
            sc_valueref_tag (sc_value_anchor args)
                `[(f pcount types)]

inline runtime-aggregate-type-constructor (f)
    box-spice-macro
        fn "runtime-aggregate-type-constructor" (args)
            let argcount = (sc_argcount args)
            verify-count argcount 0 -1
            spice-quote
                let types = (alloca-array type argcount)
                spice-unquote
                    let body = (sc_expression_new)
                    loop (i = 0)
                        if (icmp== i argcount)
                            break;
                        let arg = (sc_getarg args i)
                        let k = (sc_type_key (sc_value_qualified_type arg))
                        let arg = (sc_keyed_new unnamed arg)
                        if (ptrcmp!= (sc_value_type arg) type)
                            error "type expected"
                        sc_expression_append body
                            `(store
                                (sc_key_type k arg)
                                (getelementptr types i))
                        add i 1
                    body
                f argcount types

# static tuple type constructor
sc_type_set_symbol tuple '__typecall (aggregate-type-constructor 1 sc_tuple_type)
sc_type_set_symbol tuple 'packed (aggregate-type-constructor 1 sc_packed_tuple_type)
let union-storageof = (aggregate-type-constructor 0 sc_union_storage_type)

# dynamic tuple type constructor
sc_type_set_symbol tuple 'type (runtime-aggregate-type-constructor sc_tuple_type)
sc_type_set_symbol tuple 'packed-type (runtime-aggregate-type-constructor sc_packed_tuple_type)
let union-storage-type = (runtime-aggregate-type-constructor sc_union_storage_type)

# arguments type constructor
sc_type_set_symbol Arguments '__typecall
    box-spice-macro
        fn "Arguments" (args)
            let argcount = (sc_argcount args)
            verify-count argcount 1 -1
            let pcount = (sub argcount 1)
            let types = (alloca-array type pcount)
            loop (i = 1)
                if (icmp== i argcount)
                    break;
                let arg = (sc_getarg args i)
                let T = (unbox-pointer arg type)
                store T (getelementptr types (sub i 1))
                add i 1
            box-pointer (sc_arguments_type pcount types)

# shorter type constructor
let _: = Arguments

# static function type constructor
sc_type_set_symbol function '__typecall
    box-spice-macro
        fn "function.__typecall" (args)
            let argcount = (sc_argcount args)
            verify-count argcount 2 -1
            let pcount = (sub argcount 2)
            let rtype = (sc_getarg args 1)
            let rtype = (unbox-pointer rtype type)
            let types = (alloca-array type pcount)
            loop (i = 2)
                if (icmp== i argcount)
                    break;
                let arg = (sc_getarg args i)
                let T = (unbox-pointer arg type)
                store T (getelementptr types (sub i 2))
                add i 1
            box-pointer (sc_function_type rtype pcount types)

# dynamic function type constructor
sc_type_set_symbol function 'type
    box-spice-macro
        fn "function.type" (args)
            let argcount = (sc_argcount args)
            verify-count argcount 1 -1
            let pcount = (sub argcount 1)
            let rtype = (sc_getarg args 0)
            spice-quote
                let types = (alloca-array type pcount)
                spice-unquote
                    let expr = (sc_expression_new)
                    loop (i = 1)
                        if (icmp== i argcount)
                            break;
                        let arg = (sc_getarg args i)
                        sc_expression_append expr
                            `(store arg (getelementptr types [(sub i 1)]))
                        add i 1
                    expr
                sc_function_type rtype pcount types

let raises =
    box-spice-macro
        fn "raises" (args)
            let argcount = (sc_argcount args)
            verify-count argcount 2 2
            let self = (sc_getarg args 0)
            let except_type = (sc_getarg args 1)
            let T = (unbox-pointer self type)
            let exceptT = (unbox-pointer except_type type)
            `[(sc_function_type_raising T exceptT)]

sc_type_set_symbol type 'raises
    box-spice-macro
        fn "'raises function" (args)
            let argcount = (sc_argcount args)
            verify-count argcount 2 2
            let self = (sc_getarg args 0)
            let except_type = (sc_getarg args 1)
            `(sc_function_type_raising self except_type)

# closure constructor
#sc_type_set_symbol Closure '__typecall
    box-pointer
        inline (cls func frame)
            sc_closure_new func frame

# symbol constructor
sc_type_set_symbol Symbol '__typecall
    box-pointer
        spice-macro
            fn (args)
                let argcount = (sc_argcount args)
                verify-count argcount 2 2
                let value = (sc_getarg args 1)
                if (sc_value_is_constant value)
                    `[(sc_symbol_new (unbox-pointer value string))]
                else
                    `(sc_symbol_new value)

let none? =
    spice-macro
        fn (args)
            let argcount = (sc_argcount args)
            verify-count argcount 1 1
            let value = (sc_getarg args 0)
            box-integer
                ptrcmp== (sc_value_type value) Nothing

fn unpack2 (args)
    let argcount = (sc_argcount args)
    verify-count argcount 2 2
    let a = (sc_getarg args 0)
    let b = (sc_getarg args 1)
    return a b

let const.icmp<=.i32.i32 =
    spice-macro
        fn (args)
            let a b = (unpack2 args)
            if (sc_value_is_constant a)
                if (sc_value_is_constant b)
                    let a = (unbox-integer a i32)
                    let b = (unbox-integer b i32)
                    return
                        box-integer (icmp<=s a b)
            error "arguments must be constant"

let const.add.i32.i32 =
    spice-macro
        fn (args)
            let a b = (unpack2 args)
            if (sc_value_is_constant a)
                if (sc_value_is_constant b)
                    let a = (unbox-integer a i32)
                    let b = (unbox-integer b i32)
                    return
                        box-integer (add a b)
            error "arguments must be constant"

let static-branch =
    spice-macro
        fn (args)
            let argcount = (sc_argcount args)
            verify-count argcount 3 3
            let cond = (sc_getarg args 0)
            let thenf = (sc_getarg args 1)
            let elsef = (sc_getarg args 2)
            if (sc_value_is_constant cond)
            else
                hide-traceback;
                error@ (sc_value_anchor cond) "while checking condition"
                    "condition must be constant"
            let value = (unbox-integer cond bool)
            sc_valueref_tag (sc_value_anchor args) `([(? value thenf elsef)])

sc_type_set_symbol Value '__typecall
    box-spice-macro
        fn (args)
            raising Error
            let args = (sc_getarglist args 1)
            spice-quote
                spice-quote
                    spice-unquote args

let __unbox =
    spice-macro
        fn (args)
            let argc = (sc_argcount args)
            verify-count argc 2 2
            let value = (sc_getarg args 0)
            let T = (sc_getarg args 1)
            let T = (unbox-pointer T type)
            let VT = (sc_value_type value)
            sc_value_unwrap T value
let
    type== = (spice-macro (type-comparison-func ptrcmp==))
    type!= = (spice-macro (type-comparison-func ptrcmp!=))
    type<= = (spice-macro (type-comparison-func type<=))
    type>= = (spice-macro (type-comparison-func type>=))
    type< = (spice-macro (type-comparison-func type<))
    type> = (spice-macro (type-comparison-func type>))

""""The type of the `null` constant. This type is uninstantiable.
let NullType = (sc_typename_type "NullType" typename)
let Accessor = (sc_typename_type "Accessor" typename)
sc_typename_type_set_storage Accessor (sc_type_storage Closure) typename-flag-plain

let cons =
    spice-macro
        fn (args)
            let argc = (sc_argcount args)
            verify-count argc 1 -1
            let block = (sc_expression_new)
            let last = (sc_getarg args (sub argc 1))
            sc_expression_append block last
            loop (i last = (sub argc 1) last)
                if (icmp== i 0)
                    break block
                let i = (sub i 1)
                let arg = (sc_getarg args i)
                let anchor = (sc_value_anchor arg)
                # if both arguments are constant, produce a constant list
                if (sc_value_is_constant last)
                    if (sc_value_is_constant arg)
                        let last = (sc_list_cons arg (unbox-pointer last list))
                        let last = (sc_valueref_tag anchor `last)
                        sc_expression_append block last
                        repeat i last
                let T = (sc_value_type arg)
                let arg =
                    if (ptrcmp== T Value) arg
                    elseif (sc_value_is_pure arg) ``arg
                    else (sc_value_wrap T arg)
                let last =
                    sc_valueref_tag anchor `(sc_list_cons arg last)
                sc_expression_append block last
                _ i last

let list-constructor =
    spice-macro
        fn (args)
            raising Error
            let argc = (sc_argcount args)
            let anchor = (sc_value_anchor args)
            let newargs =
                sc_argument_list_map_new argc
                    inline (i)
                        let i = (add i 1)
                        if (icmp== i argc)
                            sc_valueref_tag anchor `'()
                        else
                            sc_getarg args i
            sc_valueref_tag anchor `(cons newargs)

let decons =
    spice-macro
        fn (args)
            raising Error
            let argc = (sc_argcount args)
            verify-count argc 1 2
            let self = (sc_getarg args 0)
            let count =
                if (icmp== argc 2) (unbox-integer (sc_getarg args 1) i32)
                else 1
            let block = (sc_expression_new)
            let argcount = (add count 1)
            let retargs = (alloca-array Value argcount)
            loop (i next = 0 self)
                let expr = `(sc_list_decons next)
                sc_expression_append block expr
                spice-quote
                    let at next = expr
                store at (getelementptr retargs i)
                let i = (add i 1)
                if (icmp== i count)
                    store next (getelementptr retargs i)
                    sc_expression_append block
                        sc_argument_list_new argcount retargs
                    break block
                _ i next

run-stage; # 3

'define-symbol type 'set-symbols
    inline "set-symbols" (self values...)
        va-lfold none
            inline (key value)
                'set-symbol self key value
            values...
'define-symbol type 'define-symbols
    inline "define-symbols" (self values...)
        va-lfold none
            inline (key value)
                'define-symbol self key value
            values...

'define-symbol Scope 'bind-symbols
    inline "bind-symbols" (self values...)
        va-lfold self
            inline (key value self)
                'bind self key value
            values...
'define-symbol Scope 'define-symbols
    inline "define-symbols" (self values...)
        va-lfold self
            inline (key value self)
                'define self key value
            values...

'define-symbols Value
    constant? = sc_value_is_constant
    pure? = sc_value_is_pure
    kind = sc_value_kind
    tag =
        inline (self anchor)
            sc_valueref_tag anchor self
    none? = (static-typify Value-none? Value)
    __repr = sc_value_repr
    spice-repr = sc_value_ast_repr
    dump =
        inline (self)
            sc_write (sc_value_ast_repr self)
    typeof = sc_value_type
    qualified-typeof = sc_value_qualified_type # deprecated
    qualifiersof = sc_value_qualified_type
    anchor = sc_value_anchor
    argcount = sc_argcount
    getarg = sc_getarg
    getarglist = sc_getarglist
    dekey =
        fn "dekey" (self)
            let k = (sc_type_key ('qualified-typeof self))
            _ k (sc_keyed_new unnamed self)

'define-symbols Scope
    @ = sc_scope_at
    local@ = sc_scope_local_at
    next = sc_scope_next
    next-deleted = sc_scope_next_deleted
    docstring = sc_scope_docstring
    module-docstring = sc_scope_module_docstring
    parent = sc_scope_get_parent
    unparent = sc_scope_unparent
    reparent = sc_scope_reparent
    bind-with-docstring = sc_scope_bind_with_docstring
    unbind = sc_scope_unbind

'define-symbols string
    join = sc_string_join
    match? = sc_string_match

'define-symbols Error
    format = sc_format_error
    dump = sc_dump_error
    append =
        inline "append" (self anchor traceback-msg)
            sc_error_append_calltrace self
                sc_valueref_tag anchor `traceback-msg
            self

'define-symbols list
    __countof = sc_list_count
    join = sc_list_join
    @ = sc_list_at
    next = sc_list_next
    decons = decons
    reverse = sc_list_reverse
    dump = sc_list_dump

'define-symbols type
    bitcount = sc_type_bitcountof
    signed? = sc_integer_type_is_signed
    strip-qualifiers = sc_strip_qualifiers
    plain? = sc_type_is_plain
    element@ = sc_type_element_at
    element-count = sc_type_countof
    unsized? = sc_type_is_unsized
    storageof = sc_type_storage
    kind = sc_type_kind
    sizeof = sc_type_sizeof
    alignof = sc_type_alignof
    offsetof = sc_type_offsetof
    @ = sc_type_at
    local@ = sc_type_local_at
    opaque? = sc_type_is_opaque
    string = sc_type_string
    superof = sc_typename_type_get_super
    docstring = sc_type_get_docstring
    set-docstring = sc_type_set_docstring
    set-opaque =
        inline (type)
            sc_typename_type_set_opaque type
    set-storage =
        inline (type storage-type)
            sc_typename_type_set_storage type storage-type 0:u32
    set-plain-storage =
        inline (type storage-type)
            sc_typename_type_set_storage type storage-type typename-flag-plain
    return-type = sc_function_type_return_type
    keyof = sc_type_key
    key-type =
        inline (self key)
            sc_key_type key self
    unique-type = sc_unique_type
    view-type =
        inline (self id)
            static-branch (none? id)
                inline ()
                    sc_view_type self -1
                inline ()
                    sc_view_type self id
    refer? = sc_type_is_refer
    view? = sc_type_is_view
    variadic? = sc_function_type_is_variadic
    pointer? =
        fn (cls)
            icmp== ('kind cls) type-kind-pointer
    function? =
        fn (cls)
            icmp== ('kind cls) type-kind-function
    function-pointer? =
        fn (cls)
            if ('pointer? cls)
                if ('function? ('element@ cls 0))
                    return true
            return false
    change-element-type =
        fn (cls ET)
            sc_pointer_type_set_element_type cls ET
    change-storage-class =
        fn (cls storage-class)
            sc_pointer_type_set_storage_class cls storage-class
    immutable =
        fn (cls)
            sc_pointer_type_set_flags cls
                bor (sc_pointer_type_get_flags cls) pointer-flag-non-writable
    mutable =
        fn (cls)
            sc_pointer_type_set_flags cls
                band (sc_pointer_type_get_flags cls)
                    bxor pointer-flag-non-writable -1:u64
    mutable& =
        fn (cls)
            sc_refer_type cls
                band (sc_refer_flags cls)
                    bxor pointer-flag-non-writable -1:u64
                sc_refer_storage_class cls
    strip-pointer-storage-class =
        fn (cls)
            sc_pointer_type_set_storage_class cls unnamed
    pointer-storage-class =
        fn (cls)
            sc_pointer_type_get_storage_class cls
    readable? =
        fn (cls)
            icmp== (band (sc_pointer_type_get_flags cls) pointer-flag-non-readable) 0:u64
    writable? =
        fn (cls)
            icmp== (band (sc_pointer_type_get_flags cls) pointer-flag-non-writable) 0:u64
    refer->pointer-type =
        fn "refer->pointer-type" (cls)
            sc_pointer_type
                sc_strip_qualifiers cls
                sc_refer_flags cls
                sc_refer_storage_class cls
    pointer->refer-type =
        fn "pointer->refer-type" (cls)
            sc_refer_type
                sc_type_element_at cls 0
                sc_pointer_type_get_flags cls
                sc_pointer_type_get_storage_class cls

let mutable =
    spice-macro
        fn (args)
            let argc = (sc_argcount args)
            verify-count argc 1 2
            if (icmp== argc 1)
                let self = (sc_getarg args 0)
                let T = (unbox-pointer self type)
                if ('refer? T)
                    return `[('mutable& T)]
                else
                    return `[('mutable T)]
            elseif (ptrcmp== (unbox-pointer (sc_getarg args 0) type) pointer)
                let self = (sc_getarg args 1)
                let T = (unbox-pointer self type)
                let T = (sc_pointer_type T pointer-flag-non-writable unnamed)
                return `[('mutable T)]
            error "syntax: (mutable <pointer-type>) or (mutable pointer <type>)"

let mutable@ =
    spice-macro
        fn (args)
            let argc = (sc_argcount args)
            verify-count argc 1 1
            let self = (sc_getarg args 0)
            let T = (unbox-pointer self type)
            let T = (sc_pointer_type T pointer-flag-non-writable unnamed)
            return `[('mutable T)]

let signed =
    spice-macro
        fn (args)
            let argc = (sc_argcount args)
            verify-count argc 1 2
            if (icmp== argc 1)
                let self = (sc_getarg args 0)
                let T = (unbox-pointer self type)
                if (icmp== ('kind T) type-kind-integer)
                    return `[(sc_integer_type ('bitcount T) true)]
            elseif (ptrcmp== (unbox-pointer (sc_getarg args 0) type) integer)
                let self = (sc_getarg args 1)
                let width = (unbox-integer self i32)
                return `[(sc_integer_type width true)]
            error "syntax: (signed <integer-type>) or (signed integer <size>)"

let protect =
    spice-macro
        fn (args)
            let argc = (sc_argcount args)
            verify-count argc 1 1
            let self = (sc_getarg args 0)
            let T = (sc_value_type self)
            if (type< T pointer)
                return `(bitcast self [('immutable T)])
            error "syntax: (protect pointer-value)"

let rawstring = (pointer i8)

# cheap version of `not` - to be replaced further down
inline not (value)
    bxor value true

# supertype for unique structs
let Struct = (sc_typename_type "Struct" typename)
sc_typename_type_set_opaque Struct

""""Generators provide a protocol for iterating the contents of containers and
    enumerating sequences. They are primarily used by `for` and `fold`, but can
    also be used separately.

    Each generator instance is equivalent to a closure that when called returns
    four functions:

    * A function `state... <- fn start ()` which returns the initial state of
      the generator as an arbitrary number of arbitrarily typed values. The
      initially returned state defines the format of the generators internal
      state.
    * A function `bool <- fn valid? (state...)` which takes the current
      generator state and returns `true` when the generator can resolve the
      state to a collection item, otherwise `false`, indicating that the
      generator has been depleted.
    * A function `value... <- fn at (state...)` which takes the current
      generator state and returns the collection item this state maps to. The
      function may not be called for a state for which `valid?` has reported
      to be depleted.
    * A function `state... <- fn next (state...)` which takes the current
      generator state and returns the state mapping to the next item in the
      collection. The new state must have the same type signature as the
      previous state. The function may not be called for a state for which
      `valid?` has reported to be depleted.

    Any of these functions may be called multiple times with any valid state,
    effectively restarting the Generator at an arbitrary point, as Generators
    are not expected to have side effects. In controlled circumstances a
    Generator may choose to be impure, but should be documented accordingly.

    Here is a typical pattern for constructing a generator:

        :::scopes
        inline make-generator (container)
            Generator
                inline "start" ()
                    # return the first iterator of sequence (might not be valid)
                    'start container
                inline "valid?" (it...)
                    # return true if the iterator is still valid
                    'valid-iterator? container it...
                inline "at" (it...)
                    # return variadic result at iterator
                    '@ container it...
                inline "next" (it...)
                    # return the next iterator in sequence
                    'next container it...

    The generator can then be subsequently used like this:

        :::scopes
        # this example prints up to two elements returned by a generator
        # generate a new instance bound to container
        let gen = (make-generator container)
        # extract all methods
        let start valid? at next = (gen)
        # get the init state
        let state... = (start)
        # check if the state is valid
        if (valid? state...)
            # container has at least one item; print it
            print (at state...)
            # advance to the next state
            let state... = (next state...)
            if (valid? state...)
                # container has one more item; print it
                print (at state...)
        # we are done; no cleanup necessary
let Generator = (sc_typename_type "Generator" typename)
'set-plain-storage Generator ('storageof Closure)

# collector type
let Collector = (sc_typename_type "Collector" typename)
'set-plain-storage Collector ('storageof Closure)

# syntax macro type
let SugarMacro = (sc_typename_type "SugarMacro" typename)
let SugarMacroFunction =
    pointer
        raises
            function (Arguments list Scope) list Scope
            Error
'set-plain-storage SugarMacro SugarMacroFunction

# any extraction

inline unbox (value T)
    hide-traceback;
    unbox-verify value T
    __unbox value T

fn value-as (vT T expr)
    if true
        return `(unbox expr T)
    error "unsupported type"

'define-symbols Value
    __as =
        inline (vT T)
            inline "Value-as" (self) (unbox self T)
    __rimply =
        inline (vT T)
            inline "Value-rimply" (self) `self

inline spice-cast-macro (f)
    """"To be used for __as, __ras, __imply and __rimply
        returns a callable converter (f value) that performs the cast or
        no arguments if the cast can not be performed.
    spice-macro
        fn (args)
            raising Error
            let argc = (sc_argcount args)
            verify-count argc 2 2
            let source-type = (unbox-pointer (sc_getarg args 0) type)
            let target-type = (unbox-pointer (sc_getarg args 1) type)
            f source-type target-type

inline spice-converter-macro (f)
    """"To be used for a converter that needs to do additional
        dispatch (i.e. do something else when the value is a constant).
        Returns a quote that performs the cast (f value T).
    spice-macro
        fn (args)
            raising Error
            let argc = (sc_argcount args)
            verify-count argc 2 2
            let self = (sc_getarg args 0)
            let _T = (sc_getarg args 1)
            let T = (unbox-pointer _T type)
            try
                f self T
            except (err)
                hide-traceback;
                error@+ err (sc_value_anchor self)
                    sc_string_join "while attempting to convert argument to " (sc_value_repr _T)

'set-symbols SpiceMacro
    __rimply =
        box-pointer
            spice-cast-macro
                fn (vT T)
                    if (ptrcmp== vT SpiceMacroFunction)
                        return `(inline (self) (bitcast self T))
                    elseif (ptrcmp== vT Closure)
                        return `spice-macro
                    `()

# integer casting

fn integer-tobool (args)
    raising Error
    let argc = (sc_argcount args)
    verify-count argc 1 1
    let self = (sc_getarg args 0)
    if ('constant? self)
        let result = (icmp!= (sc_const_int_extract self) 0:u64)
        return `result
    let T = ('typeof self)
    return `(icmp!= self (nullof T))

# as of yet unused
inline safe-integer-cast (self T)
    let selfT = ('typeof self)
    if ('constant? self)
    error
        sc_string_join
            "can not implicitly convert non-constant integer of type "
            sc_value_repr `selfT

let static-integer->integer =
    spice-converter-macro
        inline (self T)
            let selfT = ('typeof self)
            # allow non-destructive conversions
            let selfST = ('storageof selfT)
            let u64val = (sc_const_int_extract self)
            let ST = ('storageof T)
            let destw = ('bitcount ST)
            if (icmp!= (band u64val 0x8000000000000000:u64) 0:u64)
                # if the sign bit is set, signedness matters
                if (icmp!= ('signed? selfST) ('signed? ST))
                    error "implicit conversion of integer value requires same signedness"
            if (icmp>s 64 destw)
                let diff = (zext (sub 64 destw) u64)
                # check if truncation destroys bits
                let cmpval = (shl u64val diff)
                let cmpval =
                    ? ('signed? ST) (ashr cmpval diff) (lshr cmpval diff)
                if (icmp!= u64val cmpval)
                    error "integer value does not fit target type"
            return (sc_const_int_new T u64val)

let static-integer->real =
    spice-converter-macro
        inline (self T)
            let selfT = ('typeof self)
            # allow non-destructive conversions
            let selfST = ('storageof selfT)
            let u64val = (sc_const_int_extract self)
            return
                if ('signed? selfT)
                    sc_const_real_new T (sitofp u64val f64)
                else
                    sc_const_real_new T (uitofp u64val f64)

let integer->integer =
    spice-converter-macro
        inline (self T)
            let selfT = ('typeof self)
            let ST = ('storageof T)
            let destw = ('bitcount ST)
            if (band ('constant? self) (icmp<=u destw 64))
                # allow destructive conversions
                #let selfST = ('storageof selfT)
                let u64val = (sc_const_int_extract self)
                return (sc_const_int_new T u64val)
            let vT = selfT
            let valw = ('bitcount vT)
            if (icmp== destw valw)
                return `(bitcast self T)
            elseif (icmp>s destw valw)
                if ('signed? vT)
                    return `(sext self T)
                else
                    return `(zext self T)
            else
                return `(itrunc self T)

let integer->real =
    spice-converter-macro
        inline (self T)
            let selfT = ('typeof self)
            let ST = ('storageof T)
            let vT = selfT
            let signed? = ('signed? vT)
            if ('constant? self)
                # allow destructive conversions
                #let selfST = ('storageof selfT)
                let u64val = (sc_const_int_extract self)
                let f64val =
                    if signed?
                        sitofp u64val f64
                    else
                        uitofp u64val f64
                return (sc_const_real_new T f64val)
            if signed?
                return `(sitofp self T)
            else
                return `(uitofp self T)

fn integer-static-imply (vT T)
    if (type< T integer)
        let ST = ('storageof T)
        if (icmp== ('kind ST) type-kind-integer)
            if (icmp<=u ('bitcount ST) 64)
                return `(inline (self) (static-integer->integer self T))
    elseif (type< T real)
        let ST = ('storageof T)
        if (icmp== ('kind ST) type-kind-real)
            let valw = ('bitcount vT)
            let destw = ('bitcount ST)
            return `(inline (self) (static-integer->real self T))
    elseif (type== T real)
        return `(inline (self) (static-integer->real self f32))
    `()

fn integer-imply (vT T)
    if (type< T integer)
        let ST = ('storageof T)
        if (icmp== ('kind ST) type-kind-integer)
            let valw = ('bitcount vT)
            let destw = ('bitcount ST)
            # must have larger size or equal size and same bitwidth
            if (bor (icmp>s destw valw)
                    (band (icmp== destw valw)
                        (icmp== ('signed? vT) ('signed? ST))))
                return `(inline (self) (integer->integer self T))
    `()

fn integer-as (vT T)
    if (type< T integer)
        let ST = ('storageof T)
        if (icmp== ('kind ST) type-kind-integer)
            return `(inline (self) (integer->integer self T))
    elseif (type< T real)
        let ST = ('storageof T)
        if (icmp== ('kind ST) type-kind-real)
            return `(inline (self) (integer->real self T))
    `()

let real->real =
    spice-converter-macro
        inline (self T)
            let selfT = ('typeof self)
            let ST = ('storageof T)
            let destw = ('bitcount ST)
            if ('constant? self)
                # allow destructive conversions
                let f64val = (sc_const_real_extract self)
                return (sc_const_real_new T f64val)
            let vT = selfT
            let valw = ('bitcount vT)
            let kind = ('kind ST)
            if (icmp== destw valw)
                return `(bitcast self T)
            elseif (icmp>s destw valw)
                return `(fpext self T)
            else
                return `(fptrunc self T)

let real->integer =
    spice-converter-macro
        inline (self T)
            let selfT = ('typeof self)
            let ST = ('storageof T)
            let signed? = ('signed? ST)
            if ('constant? self)
                # allow destructive conversions
                let f64val = (sc_const_real_extract self)
                let u64val =
                    if signed?
                        fptosi f64val u64
                    else
                        fptoui f64val u64
                return (sc_const_int_new T u64val)
            if signed?
                return `(fptosi self T)
            else
                return `(fptoui self T)

# only perform safe casts: i.e. float to double
fn real-imply (vT T)
    if (type< T real)
        let ST = ('storageof T)
        if (icmp== ('kind ST) type-kind-real)
            let valw = ('bitcount vT)
            let destw = ('bitcount ST)
            if (icmp>=s destw valw)
                return `(inline (self) (real->real self T))
    `()

# more aggressive cast that converts from all numerical types
fn real-as (vT T)
    if (type< T real)
        let ST = ('storageof T)
        let kind = ('kind ST)
        if (icmp== kind type-kind-real)
            return `(inline (self) (real->real self T))
    elseif (type< T integer)
        let ST = ('storageof T)
        let kind = ('kind ST)
        if (icmp== kind type-kind-integer)
            return `(inline (self) (real->integer self T))
    `()

# cast protocol
#------------------------------------------------------------------------------

inline cast-error (intro-string vT T)
    hide-traceback;
    error
        sc_string_join intro-string
            sc_string_join ('__repr (box-pointer vT))
                sc_string_join " to type " ('__repr (box-pointer T))

fn operator-valid? (value)
    ptrcmp!= ('typeof value) void

fn cast-converter (symbol rsymbol vQT T)
    """"For two given types, find a matching conversion function.
        This function only works inside a spice macro.
    let vT = ('strip-qualifiers vQT)
    label next
        let f =
            try ('@ vT symbol)
            except (err) (merge next)
        let conv = (sc_prove `(f vT T))
        if (operator-valid? conv) (return conv)
        if (ptrcmp!= vT vQT)
            let conv = (sc_prove `(f vQT T))
            if (operator-valid? conv) (return conv)
    label next
        let f =
            try ('@ T rsymbol)
            except (err) (merge next)
        let conv = (sc_prove `(f vT T))
        if (operator-valid? conv) (return conv)
        if (ptrcmp!= vT vQT)
            let conv = (sc_prove `(f vQT T))
            if (operator-valid? conv) (return conv)
    return (sc_empty_argument_list)

fn imply-converter (vQT T static?)
    let vT = ('strip-qualifiers vQT)
    if (ptrcmp== vT T)
        return `_
    if (sc_type_is_superof T vT)
        return `_
    if (ptrcmp== T bool)
        try
            return ('@ vT '__tobool)
        except (err)
    if static?
        let conv =
            cast-converter '__static-imply '__static-rimply vQT T
        if (operator-valid? conv) (return conv)
    cast-converter '__imply '__rimply vQT T

fn as-converter (vQT T static?)
    let vT = ('strip-qualifiers vQT)
    if (ptrcmp== vT T)
        return `_
    if (sc_type_is_superof T vT)
        return `_
    if (ptrcmp== T bool)
        try
            return ('@ vT '__tobool)
        except (err)
    let conv = (cast-converter '__as '__ras vQT T)
    if (operator-valid? conv) (return conv)
    # try implicit cast last
    if static?
        let conv =
            cast-converter '__static-imply '__static-rimply vQT T
        if (operator-valid? conv) (return conv)
    cast-converter '__imply '__rimply vQT T

inline gen-cast-op (f str)
    spice-macro
        fn "cast-op" (args)
            let argc = ('argcount args)
            verify-count argc 2 2
            let value = ('getarg args 0)
            let anyT = ('getarg args 1)
            let vT = ('qualified-typeof value)
            let T = (unbox-pointer anyT type)
            let conv = (f vT T ('constant? value))
            if (operator-valid? conv)
                return `(conv value)
            cast-error str vT T

let imply = (gen-cast-op imply-converter "can't coerce value of type ")
let as = (gen-cast-op as-converter "can't cast value of type ")

# operator protocol
#------------------------------------------------------------------------------

fn unary-operator (symbol T)
    """"For an operation performed on one variable argument type, find a
        matching operator function. This function only works inside a spice
        macro.
    label next
        let f =
            try ('@ T symbol)
            except (err) (merge next)
        let op = (sc_prove `(f T))
        if (operator-valid? op) (return op)
    return (sc_empty_argument_list)

fn binary-operator (symbol lhsT rhsT)
    """"For an operation performed on two argument types, of which only
        the left type can provide a suitable candidate, find a matching
        operator function. This function only works inside a spice macro.
    label next
        let f =
            try ('@ lhsT symbol)
            except (err) (merge next)
        let op = (sc_prove `(f lhsT rhsT))
        if (operator-valid? op) (return op)
    return (sc_empty_argument_list)

fn binary-operator-r (rsymbol lhsT rhsT)
    """"For an operation performed on two argument types, of which only
        the right type can provide a suitable candidate, find a matching
        operator function. This function only works inside a spice macro.
    label next
        let f =
            try ('@ rhsT rsymbol)
            except (err) (merge next)
        let op = (sc_prove `(f lhsT rhsT))
        if (operator-valid? op) (return op)
    return (sc_empty_argument_list)

fn balanced-binary-operator (symbol rsymbol lhsT rhsT lhs-static? rhs-static?)
    """"For an operation performed on two argument types, of which either
        type can provide a suitable candidate, return a matching operator.
        This function only works inside a spice macro.
    # try the left type
    let op = (binary-operator symbol lhsT rhsT)
    if (operator-valid? op) (return op)
    if (ptrcmp!= lhsT rhsT)
        # asymmetrical types

        # try the right type
        let op = (binary-operator-r rsymbol lhsT rhsT)
        if (operator-valid? op) (return op)

        # can we cast rhsT to lhsT?
        let conv = (imply-converter rhsT lhsT rhs-static?)
        if (operator-valid? conv)
            # is symmetrical op supported for the left type?
            let op = (binary-operator symbol lhsT lhsT)
            if (operator-valid? op)
                return `(inline (lhs rhs) (op lhs (conv rhs)))

        # can we cast lhsT to rhsT?
        let conv = (imply-converter lhsT rhsT lhs-static?)
        if (operator-valid? conv)
            # is symmetrical op supported for the right type?
            let op = (binary-operator symbol rhsT rhsT)
            if (operator-valid? op)
                return `(inline (lhs rhs) (op (conv lhs) rhs))
    return (sc_empty_argument_list)

# right hand has same type as left hand
fn balanced-lvalue-binary-operator (symbol lhsT rhsT rhs-static?)
    """"For an operation performed on two argument types, of which only the
        left type type can provide a suitable candidate, return a matching operator.
        This function only works inside a spice macro.
    # try the left type
    let op = (binary-operator symbol lhsT rhsT)
    if (operator-valid? op) (return op)
    if (ptrcmp!= lhsT rhsT)
        # asymmetrical types

        # can we cast rhsT to lhsT?
        let conv = (imply-converter rhsT lhsT rhs-static?)
        if (operator-valid? conv)
            # is symmetrical op supported for the left type?
            let op = (binary-operator symbol lhsT lhsT)
            if (operator-valid? op)
                return `(inline (lhs rhs) (op lhs (conv rhs)))
    return (sc_empty_argument_list)

fn unary-op-error (friendly-op-name T)
    hide-traceback;
    error
        'join "can't "
            'join friendly-op-name
                'join " value of type " ('__repr (box-pointer T))

fn binary-op-error (friendly-op-name lhsT rhsT)
    hide-traceback;
    error
        'join "can't "
            'join friendly-op-name
                'join " values of types "
                    'join ('__repr (box-pointer lhsT))
                        'join " and "
                            '__repr (box-pointer rhsT)

fn balanced-binary-operation (args symbol rsymbol friendly-op-name)
    let argc = ('argcount args)
    verify-count argc 2 2
    let lhs rhs =
        'getarg args 0
        'getarg args 1
    let lhsT = ('typeof lhs)
    let rhsT = ('typeof rhs)
    let op = (balanced-binary-operator symbol rsymbol lhsT rhsT
        ('constant? lhs) ('constant? rhs))
    if (operator-valid? op)
        return ('tag `(op lhs rhs) ('anchor args))
    hide-traceback;
    binary-op-error friendly-op-name lhsT rhsT

fn balanced-lvalue-binary-operation (args symbol friendly-op-name)
    let argc = ('argcount args)
    verify-count argc 2 2
    let lhs rhs =
        'getarg args 0
        'getarg args 1
    let lhsT = ('typeof lhs)
    let rhsT = ('typeof rhs)
    let op = (balanced-lvalue-binary-operator symbol lhsT rhsT ('constant? rhs))
    if (operator-valid? op)
        return ('tag `(op lhs rhs) ('anchor args))
    hide-traceback;
    binary-op-error friendly-op-name lhsT rhsT

# right hand has fixed type - this one doesn't need a dispatch step
fn unbalanced-binary-operation (args symbol rtype friendly-op-name)
    let argc = ('argcount args)
    verify-count argc 2 2
    let lhs rhs =
        'getarg args 0
        'getarg args 1
    let lhsT = ('typeof lhs)
    let rhsT = ('typeof rhs)
    let rhs =
        if (ptrcmp== rhsT rtype) rhs
        else
            # can we cast rhsT to rtype?
            let conv = (imply-converter rhsT rtype ('constant? rhs))
            if (operator-valid? conv)
                `(conv rhs)
            else
                cast-error "can't coerce secondary argument of type " rhsT rtype
    let f =
        try ('@ lhsT symbol)
        except (err)
            unary-op-error friendly-op-name lhsT
    'tag `(f lhs rhs) ('anchor args)

# unary operations don't need a dispatch step either
fn unary-operation (args symbol friendly-op-name)
    let argc = ('argcount args)
    verify-count argc 1 1
    let u = ('getarg args 0)
    let T = ('typeof u)
    let f =
        try ('@ T symbol)
        except (err)
            unary-op-error friendly-op-name T
    'tag `(f u) ('anchor args)

fn unary-or-balanced-binary-operation (args usymbol ufriendly-op-name symbol rsymbol friendly-op-name)
    let argc = ('argcount args)
    if (icmp== argc 1)
        unary-operation args usymbol ufriendly-op-name
    else
        balanced-binary-operation args symbol rsymbol friendly-op-name

fn unary-or-unbalanced-binary-operation (args usymbol ufriendly-op-name symbol rtype friendly-op-name)
    let argc = ('argcount args)
    if (icmp== argc 1)
        unary-operation args usymbol ufriendly-op-name
    else
        unbalanced-binary-operation args symbol rtype friendly-op-name

inline unary-op-dispatch (symbol friendly-op-name)
    spice-macro (fn (args) (unary-operation args symbol friendly-op-name))

inline unary-or-balanced-binary-op-dispatch (usymbol ufriendly-op-name symbol rsymbol friendly-op-name)
    spice-macro (fn (args) (unary-or-balanced-binary-operation
        args usymbol ufriendly-op-name symbol rsymbol friendly-op-name))

inline unary-or-unbalanced-binary-op-dispatch (usymbol ufriendly-op-name symbol rtype friendly-op-name)
    spice-macro (fn (args) (unary-or-unbalanced-binary-operation
        args usymbol ufriendly-op-name symbol rtype friendly-op-name))

inline balanced-binary-op-dispatch (symbol rsymbol friendly-op-name)
    spice-macro
        fn (args)
            hide-traceback;
            balanced-binary-operation args symbol rsymbol friendly-op-name

inline balanced-lvalue-binary-op-dispatch (symbol friendly-op-name)
    spice-macro
        fn (args)
            hide-traceback;
            balanced-lvalue-binary-operation args symbol friendly-op-name

inline unbalanced-binary-op-dispatch (symbol rtype friendly-op-name)
    spice-macro
        fn (args)
            hide-traceback;
            unbalanced-binary-operation args symbol rtype friendly-op-name

inline spice-binary-op-macro (f)
    """"To be used for binary operators of which either type can provide an
        operation. Returns a callable operator `(f lhs rhs)` that performs the
        operation or no arguments if the operation can not be performed.
    spice-macro
        fn (args)
            raising Error
            let argc = (sc_argcount args)
            verify-count argc 2 2
            let lhs-type = (unbox-pointer (sc_getarg args 0) type)
            let rhs-type = (unbox-pointer (sc_getarg args 1) type)
            f lhs-type rhs-type

inline simple-binary-op (f)
    """"For cases where the type only interacts with itself.
    spice-binary-op-macro
        inline (lhsT rhsT)
            if (ptrcmp== lhsT rhsT)
                return `f
            `()

inline simple-folding-binary-op (f unboxer boxer)
    spice-binary-op-macro
        inline (lhsT rhsT)
            let f =
                spice-macro
                    fn (args)
                        let argc = ('argcount args)
                        verify-count argc 2 2
                        let lhs = ('getarg args 0)
                        let rhs = ('getarg args 1)
                        'tag
                            if (band ('constant? lhs) ('constant? rhs))
                                let T = ('typeof lhs)
                                let lhs = (unboxer lhs)
                                let rhs = (unboxer rhs)
                                boxer T (f lhs rhs)
                            else
                                `(f lhs rhs)
                            'anchor args
            if (ptrcmp== lhsT rhsT)
                return `f
            `()

fn autoboxer (T x) `x
inline simple-folding-autotype-binary-op (f unboxer)
    simple-folding-binary-op f unboxer autoboxer

inline simple-signed-binary-op (sf uf)
    spice-binary-op-macro
        inline (lhsT rhsT)
            if (ptrcmp== lhsT rhsT)
                if ('signed? lhsT)
                    return `sf
                else
                    return `uf
            `()

inline simple-folding-signed-binary-op (sf uf unboxer boxer)
    spice-binary-op-macro
        inline (lhsT rhsT)
            let f =
                spice-macro
                    fn (args)
                        let argc = ('argcount args)
                        verify-count argc 2 2
                        let lhs = ('getarg args 0)
                        let rhs = ('getarg args 1)
                        let lhsT = ('typeof lhs)
                        let signed? = ('signed? lhsT)
                        'tag
                            if (band ('constant? lhs) ('constant? rhs))
                                let lhs = (unboxer lhs)
                                let rhs = (unboxer rhs)
                                if signed?
                                    boxer lhsT (sf lhs rhs)
                                else
                                    boxer lhsT (uf lhs rhs)
                            elseif signed?
                                `(sf lhs rhs)
                            else
                                `(uf lhs rhs)
                            'anchor args
            if (ptrcmp== lhsT rhsT)
                return `f
            `()

inline simple-folding-autotype-signed-binary-op (sf uf unboxer)
    simple-folding-signed-binary-op sf uf unboxer autoboxer

# support for calling macro functions directly
'set-symbols SugarMacro
    __call =
        box-pointer
            spice-macro
                fn (args)
                    raising Error
                    let argc = (sc_argcount args)
                    verify-count argc 3 3
                    let self = (sc_getarg args 0)
                    let topexpr = (sc_getarg args 1)
                    let scope = (sc_getarg args 2)
                    `((bitcast self SugarMacroFunction) topexpr scope)

'define-symbols Symbol
    unique =
        inline (cls name)
            sc_symbol_new_unique name
    variadic? = sc_symbol_is_variadic

'set-symbols Symbol
    __== = (box-pointer (simple-folding-autotype-binary-op icmp== sc_const_int_extract))
    __!= = (box-pointer (simple-folding-autotype-binary-op icmp!= sc_const_int_extract))
    __as =
        box-pointer
            spice-cast-macro
                inline (vT T)
                    if (ptrcmp== T string)
                        return `sc_symbol_to_string
                    `()

fn string@ (self i)
    let s = (sc_string_buffer self)
    load (getelementptr s i)

'define-symbols string
    buffer = sc_string_buffer
    __countof = sc_string_count
    __@ = string@
    __lslice = sc_string_lslice
    __rslice = sc_string_rslice

'set-symbols string
    __== = (box-pointer (simple-binary-op ptrcmp==))
    __!= = (box-pointer (simple-binary-op ptrcmp!=))
    __.. = (box-pointer (simple-folding-autotype-binary-op sc_string_join
        (inline (x) (unbox-pointer x string))))
    __< = (box-pointer (simple-binary-op (inline (a b) (icmp<s (sc_string_compare a b) 0))))
    __<= = (box-pointer (simple-binary-op (inline (a b) (icmp<=s (sc_string_compare a b) 0))))
    __> = (box-pointer (simple-binary-op (inline (a b) (icmp>s (sc_string_compare a b) 0))))
    __>= = (box-pointer (simple-binary-op (inline (a b) (icmp>=s (sc_string_compare a b) 0))))

'define-symbols list
    __typecall = list-constructor
    __repr =
        inline "list-repr" (self)
            sc_list_repr self

'set-symbols list
    __.. = (box-pointer (simple-binary-op sc_list_join))
    __== = (box-pointer (simple-binary-op sc_list_compare))

fn dispatch-and-or (args flip)
    let argc = ('argcount args)
    verify-count argc 2 -1
    let elsef cond =
        'getarg args 0
        'getarg args 1
    let thenargs =
        'getarglist args 1
    let call-elsef = `(elsef)
    let condT = ('typeof cond)
    let conv = (imply-converter condT bool ('constant? cond))
    let condbool =
        if (operator-valid? conv)
            hide-traceback;
            sc_prove ('tag `(conv cond) ('anchor cond))
        else cond
    if (ptrcmp== ('typeof condbool) bool)
        if ('constant? condbool)
            let value = (unbox-integer condbool bool)
            return
                if (bxor value flip) thenargs
                else call-elsef
    elseif flip
        return call-elsef
    else
        return thenargs
    sc_cond_new condbool
        if flip
            _ call-elsef thenargs
        else
            _ thenargs call-elsef

let safe-shl =
    spice-macro
        fn (args)
            let argc = ('argcount args)
            verify-count argc 2 2
            let lhs rhs = ('getarg args 0) ('getarg args 1)
            let lhsT = ('typeof lhs)
            let rhsT = ('typeof rhs)
            let bits = ('bitcount lhsT)
            let maskval = (zext (sub bits 1) u64)
            let mask = (sc_const_int_new rhsT maskval)
            if ('constant? lhs)
                if ('constant? rhs)
                    let lhs = (sc_const_int_extract lhs)
                    let rhs = (sc_const_int_extract rhs)
                    let lhs = (shl lhs (band rhs maskval))
                    return (sc_const_int_new lhsT lhs)
            # mask right hand side by bit width
            `(shl lhs (band rhs mask))

fn powi (base exponent)
    let T = (typeof base)
    let
        0T = (nullof T)
        1T = (zext 1 T)
        2T = (zext 2 T)
    # special case for constant base 2
    if (icmp== base 2T)
        return
            shl 1T exponent
    loop (result cur exponent = 1T base exponent)
        if (icmp== exponent 0T)
            return result
        else
            repeat
                do
                    if (icmp== (band exponent 1T) 0T) result
                    else
                        mul result cur
                mul cur cur
                lshr exponent 1T

'set-symbols integer
    __tobool = (box-pointer (spice-macro integer-tobool))
    __imply = (box-pointer (spice-cast-macro integer-imply))
    __static-imply = (box-pointer (spice-cast-macro integer-static-imply))
    __as = (box-pointer (spice-cast-macro integer-as))
    __+ = (box-pointer (simple-folding-binary-op add sc_const_int_extract sc_const_int_new))
    __- = (box-pointer (simple-folding-binary-op sub sc_const_int_extract sc_const_int_new))
    __* = (box-pointer (simple-folding-binary-op mul sc_const_int_extract sc_const_int_new))
    __** = (box-pointer (simple-folding-binary-op powi sc_const_int_extract sc_const_int_new))
    __// = (box-pointer (simple-folding-signed-binary-op sdiv udiv sc_const_int_extract sc_const_int_new))
    __/ =
        box-pointer
            simple-folding-autotype-signed-binary-op
                inline (a b) (fdiv (sitofp a f32) (sitofp b f32))
                inline (a b) (fdiv (uitofp a f32) (uitofp b f32))
                \ sc_const_int_extract
    __% = (box-pointer (simple-folding-signed-binary-op srem urem sc_const_int_extract sc_const_int_new))
    __& = (box-pointer (simple-folding-binary-op band sc_const_int_extract sc_const_int_new))
    __| = (box-pointer (simple-folding-binary-op bor sc_const_int_extract sc_const_int_new))
    __^ = (box-pointer (simple-folding-binary-op bxor sc_const_int_extract sc_const_int_new))
    __<< = (box-pointer (simple-binary-op safe-shl))
    __>> = (box-pointer (simple-folding-signed-binary-op ashr lshr sc_const_int_extract sc_const_int_new))
    __== = (box-pointer (simple-folding-autotype-binary-op icmp== sc_const_int_extract))
    __!= = (box-pointer (simple-folding-autotype-binary-op icmp!= sc_const_int_extract))
    __< = (box-pointer (simple-folding-autotype-signed-binary-op icmp<s icmp<u sc_const_int_extract))
    __<= = (box-pointer (simple-folding-autotype-signed-binary-op icmp<=s icmp<=u sc_const_int_extract))
    __> = (box-pointer (simple-folding-autotype-signed-binary-op icmp>s icmp>u sc_const_int_extract))
    __>= = (box-pointer (simple-folding-autotype-signed-binary-op icmp>=s icmp>=u sc_const_int_extract))

inline intdiv (a b)
    sdiv (fptosi a i32) (fptosi b i32)

'set-symbols real
    __imply = (box-pointer (spice-cast-macro real-imply))
    __as = (box-pointer (spice-cast-macro real-as))
    __== = (box-pointer (simple-folding-autotype-binary-op fcmp==o sc_const_real_extract))
    __!= = (box-pointer (simple-folding-autotype-binary-op fcmp!=u sc_const_real_extract))
    __> = (box-pointer (simple-folding-autotype-binary-op fcmp>o sc_const_real_extract))
    __>= = (box-pointer (simple-folding-autotype-binary-op fcmp>=o sc_const_real_extract))
    __< = (box-pointer (simple-folding-autotype-binary-op fcmp<o sc_const_real_extract))
    __<= = (box-pointer (simple-folding-autotype-binary-op fcmp<=o sc_const_real_extract))
    __+ = (box-pointer (simple-folding-binary-op fadd sc_const_real_extract sc_const_real_new))
    __- = (box-pointer (simple-folding-binary-op fsub sc_const_real_extract sc_const_real_new))
    __* = (box-pointer (simple-folding-binary-op fmul sc_const_real_extract sc_const_real_new))
    __/ = (box-pointer (simple-folding-binary-op fdiv sc_const_real_extract sc_const_real_new))
    __// = (box-pointer (simple-folding-autotype-binary-op intdiv sc_const_real_extract))
    __% = (box-pointer (simple-folding-binary-op frem sc_const_real_extract sc_const_real_new))
    __** = (box-pointer (simple-folding-binary-op powf sc_const_real_extract sc_const_real_new))

'set-symbols Value
    __== = (box-pointer (simple-binary-op sc_value_compare))

'set-symbols Closure
    __== = (box-pointer (simple-folding-autotype-binary-op ptrcmp== sc_const_pointer_extract))
    __!= = (box-pointer (simple-folding-autotype-binary-op ptrcmp!= sc_const_pointer_extract))

'define-symbols type
    __@ = sc_type_element_at

'set-symbols type
    __== = (box-pointer (simple-binary-op type==))
    __!= = (box-pointer (simple-binary-op type!=))
    __< = (box-pointer (simple-binary-op type<))
    __<= = (box-pointer (simple-binary-op type<=))
    __> = (box-pointer (simple-binary-op type>))
    __>= = (box-pointer (simple-binary-op type>=))
    __countof =
        box-spice-macro
            fn "type-countof" (args)
                let argc = ('argcount args)
                verify-count argc 1 1
                let self = ('getarg args 0)
                hide-traceback;
                `[(sc_type_countof (unbox-pointer self type))]
    __toptr =
        box-pointer
            spice-macro
                fn (args)
                    let argc = ('argcount args)
                    verify-count argc 1 1
                    let self = ('getarg args 0)
                    'tag `[(sc_refer_type (unbox-pointer self type) pointer-flag-non-writable unnamed)]
                        'anchor args
    __toref =
        box-pointer
            inline (self)
                pointer self
    # (dispatch-attr T key thenf elsef)
    dispatch-attr =
        box-spice-macro
            fn "type-dispatch-attr" (args)
                let argc = ('argcount args)
                verify-count argc 4 4
                let self key thenf elsef =
                    'getarg args 0
                    'getarg args 1
                    'getarg args 2
                    'getarg args 3
                let self = (unbox-pointer self type)
                let key = (unbox-symbol key Symbol)
                try
                    let result = (sc_type_at self key)
                    return `(thenf result)
                except (err)
                    return `(elsef)
    __getattr =
        box-spice-macro
            fn "type-getattr" (args)
                let argc = ('argcount args)
                verify-count argc 2 2
                let self key =
                    'getarg args 0
                    'getarg args 1
                let self = (unbox-pointer self type)
                let key = (unbox-symbol key Symbol)
                let f =
                    try ('@ self '__typeattr)
                    else
                        hide-traceback;
                        return (sc_type_at self key)
                'tag `(f args) ('anchor args)

'set-symbols Scope
    __== = (box-pointer (simple-binary-op ptrcmp==))
    __getattr =
        box-spice-macro
            fn "scope-getattr" (args)
                let argc = ('argcount args)
                verify-count argc 2 2
                let self key =
                    'getarg args 0
                    'getarg args 1
                let self = (unbox-pointer self Scope)
                hide-traceback;
                return (sc_scope_at self key)
    __typecall =
        box-spice-macro
            fn "scope-typecall" (args)
                """"There are two ways to create a new Scope:
                    `Scope`
                        creates an empty scope without parent
                    `Scope parent`
                        creates an empty scope descending from `parent`
                let argc = ('argcount args)
                verify-count argc 1 2
                switch argc
                case 1 `(sc_scope_new)
                default
                    `(sc_scope_new_subscope [ ('getarg args 1) ])

#---------------------------------------------------------------------------
# nothing type
#---------------------------------------------------------------------------

'set-symbols Nothing
    __tobool = (box-pointer (inline () false))
    __== =
        box-pointer
            spice-binary-op-macro
                inline (lhsT rhsT)
                    inline always-true (a b) true
                    if (ptrcmp== rhsT Nothing)
                        return `always-true
                    `()

#---------------------------------------------------------------------------
# null type
#---------------------------------------------------------------------------

'set-plain-storage NullType (pointer void)
do
    inline null== (lhs rhs) (icmp== (ptrtoint rhs usize) 0:usize)
    inline nullr== (lhs rhs) (icmp== (ptrtoint lhs usize) 0:usize)

    'set-symbols NullType
        __repr =
            box-pointer
                inline (self)
                    sc_default_styler style-number "null"
        __imply =
            box-pointer
                spice-cast-macro
                    fn "null-imply" (cls T)
                        if (icmp== ('kind ('storageof T)) type-kind-pointer)
                            return `(inline (self) (bitcast self T))
                        `()
        __== =
            box-pointer
                spice-binary-op-macro
                    inline (lhsT rhsT)
                        if (icmp== ('kind ('storageof rhsT)) type-kind-pointer)
                            return `null==
                        `()
        __r== =
            box-pointer
                spice-binary-op-macro
                    inline (lhsT rhsT)
                        if (icmp== ('kind ('storageof lhsT)) type-kind-pointer)
                            return `nullr==
                        `()

let
    and-branch = (spice-macro (fn (args) (dispatch-and-or args true)))
    or-branch = (spice-macro (fn (args) (dispatch-and-or args false)))
    #implyfn = (static-typify implyfn type type)
    #asfn = (static-typify asfn type type)
    countof = (unary-op-dispatch '__countof "count")
    unpack = (unary-op-dispatch '__unpack "unpack")
    hash1 = (unary-op-dispatch '__hash "hash")
    copy = (unary-op-dispatch '__copy "copy")
    ~ = (unary-op-dispatch '__~ "bitwise-negate")
    == = (balanced-binary-op-dispatch '__== '__r== "compare")
    != = (balanced-binary-op-dispatch '__!= '__r!= "compare")
    < = (balanced-binary-op-dispatch '__< '__r< "compare")
    <= = (balanced-binary-op-dispatch '__<= '__r<= "compare")
    > = (balanced-binary-op-dispatch '__> '__r> "compare")
    >= = (balanced-binary-op-dispatch '__>= '__r>= "compare")
    in = (balanced-binary-op-dispatch '__in '__rin "find element with")
    + = (balanced-binary-op-dispatch '__+ '__r+ "add")
    - = (unary-or-balanced-binary-op-dispatch '__neg "negate" '__- '__r- "subtract")
    * = (balanced-binary-op-dispatch '__* '__r* "multiply")
    ** = (balanced-binary-op-dispatch '__** '__r** "exponentiate")
    / = (unary-or-balanced-binary-op-dispatch '__rcp "invert" '__/ '__r/ "real-divide")
    // = (balanced-binary-op-dispatch '__// '__r// "integer-divide")
    % = (balanced-binary-op-dispatch '__% '__r% "modulate")
    & = (unary-or-balanced-binary-op-dispatch '__toptr "reference" '__& '__r& "apply bitwise-and to")
    | = (balanced-binary-op-dispatch '__| '__r| "apply bitwise-or to")
    ^ = (balanced-binary-op-dispatch '__^ '__r^ "apply bitwise-xor to")
    << = (balanced-binary-op-dispatch '__<< '__r<< "apply left shift with")
    >> = (balanced-binary-op-dispatch '__>> '__r>> "apply right shift with")
    .. = (balanced-binary-op-dispatch '__.. '__r.. "join")
    = = (balanced-lvalue-binary-op-dispatch '__= "apply assignment with")
    @ = (unary-or-unbalanced-binary-op-dispatch '__toref "dereference" '__@ integer "apply subscript operator with")
    #getattr = (unbalanced-binary-op-dispatch '__getattr Symbol "get attribute from")
    lslice = (unbalanced-binary-op-dispatch '__lslice usize "apply left-slice operator with")
    rslice = (unbalanced-binary-op-dispatch '__rslice usize "apply right-slice operator with")

let typeattr =
    spice-macro
        fn "typeattr" (args)
            let argc = ('argcount args)
            verify-count argc 2 2
            let self key =
                'getarg args 0
                'getarg args 1
            let self = (unbox-pointer self type)
            let key = (unbox-symbol key Symbol)
            hide-traceback;
            return (sc_type_at self key)

let getattr =
    spice-macro
        fn (args)
            let argc = ('argcount args)
            verify-count argc 2 2
            let lhs rhs =
                'getarg args 0
                'getarg args 1
            let lhsT = ('typeof lhs)
            let rhsT = ('typeof rhs)
            let rhs =
                if (ptrcmp== rhsT Symbol) rhs
                else
                    # can we cast rhsT to rtype?
                    let conv = (imply-converter rhsT Symbol ('constant? rhs))
                    if (operator-valid? conv)
                        sc_prove `(conv rhs)
                    else
                        cast-error "can't coerce secondary argument of type " rhsT Symbol
            let sym = (unbox-symbol rhs Symbol)
            label skip-accessor-lookup
                let prop =
                    try ('@ lhsT sym)
                    else (merge skip-accessor-lookup)
                if (ptrcmp!= ('typeof prop) Accessor)
                    merge skip-accessor-lookup;
                if (not ('constant? prop))
                    merge skip-accessor-lookup
                let prop = (unbox-pointer prop Accessor)
                let prop = (bitcast prop Closure)
                return
                    'tag `(prop lhs rhs) ('anchor args)
            let f =
                try ('@ lhsT '__getattr)
                else
                    # produce a more helpful error message
                    '@ lhsT sym
            'tag `(f lhs rhs) ('anchor args)

let drop =
    spice-macro
        fn (args)
            let argc = ('argcount args)
            verify-count argc 1 1
            let value = ('getarg args 0)
            let anchor = ('anchor args)
            let dropped = (sc_prove ('tag `(dropped? value) anchor))
            if (unbox-integer dropped bool) `()
            else
                let block = (sc_expression_new)
                sc_expression_append block ('tag `(__drop value) anchor)
                sc_expression_append block ('tag `(lose value) anchor)
                block

let repr =
    spice-macro
        fn (args)
            fn type-is-default-suffix? (CT)
                if (sc_type_is_default_suffix CT) true
                elseif (ptrcmp== CT NullType) true
                else false
            let argc = ('argcount args)
            verify-count argc 1 1
            let value = ('getarg args 0)
            let T = ('typeof value)
            try
                let f = (sc_type_at T '__repr)
                `(f value)
            else
                let s = `(sc_value_content_repr value)
                if (type-is-default-suffix? T) s
                else
                    let suffix =
                        sc_string_join
                            sc_default_styler style-operator ":"
                            sc_default_styler style-type ('string T)
                    `(sc_string_join s suffix)

let tostring =
    box-spice-macro
        fn (args)
            let argc = ('argcount args)
            verify-count argc 1 -1
            let value = ('getarg args 0)
            let T = ('typeof value)
            try
                let f = ('@ T '__tostring)
                `(f value)
            else
                try
                    let f = (sc_type_at T '__repr)
                    `(f value)
                else
                    if ('constant? value)
                        `[(sc_value_tostring value)]
                    else
                        `(sc_value_tostring value)

run-stage; # 4

inline gen-cast? (converterf)
    spice-macro
        fn "cast?" (args)
            let argc = ('argcount args)
            verify-count argc 2 2
            let value = ('getarg args 0)
            let T = (as ('getarg args 1) type)
            let valueT constant =
                if (band (== ('typeof value) type) ('constant? value))
                    _ (as value type) false
                else (_ ('qualified-typeof value) ('constant? value))
            let conv = (converterf valueT T constant)
            let result = (operator-valid? conv)
            `result

let imply? = (gen-cast? imply-converter)
let as? = (gen-cast? as-converter)

'set-symbols integer
    __~ = (box-pointer (inline (self) (^ self (as -1 (typeof self)))))
    __neg = (box-pointer (inline (self) (- (as 0 (typeof self)) self)))
    __rcp = (box-pointer (inline (self) (/ (as 1 (typeof self)) self)))

'set-symbols real
    __neg = (box-pointer (inline (self) (- (as 0 (typeof self)) self)))
    __rcp = (box-pointer (inline (self) (/ (as 1 (typeof self)) self)))
    __tobool = (box-pointer (inline (self) (!= self (as 0 (typeof self)))))

let opaque =
    spice-macro
        fn "opaque" (args)
            let argc = ('argcount args)
            verify-count argc 1 2
            let name = (as ('getarg args 0) string)
            let supertype =
                if (> argc 1) (as ('getarg args 1) type)
                else typename
            let TT = (sc_typename_type name supertype)
            sc_typename_type_set_opaque TT
            'tag `TT ('anchor args)

do
    # default copy operator
    let default-copy =
        box-pointer
            spice-macro
                fn (args)
                    let argc = ('argcount args)
                    verify-count argc 1 1
                    let self = ('getarg args 0)
                    let T = ('storageof ('typeof self))
                    if (not ('plain? T))
                        hide-traceback;
                        error "cannot copy value of non-plain storage type"
                    let anchor = ('anchor args)
                    'tag `(dupe (deref self)) anchor

    'set-symbols immutable
        __copy = default-copy
    'set-symbols pointer
        __copy = default-copy
    'set-symbols aggregate
        __copy = default-copy
    'set-symbols CStruct
        __copy = default-copy
    'set-symbols Error
        __copy = default-copy

'set-symbols typename
    # inverted compare attempts regular compare
    __!= = (box-pointer (simple-binary-op (inline (lhs rhs) (not (== lhs rhs)))))
    # default assignment operator
    __= =
        box-pointer
            simple-binary-op
                spice-macro
                    fn (args)
                        let argc = ('argcount args)
                        verify-count argc 2 2
                        let lhs = ('getarg args 0)
                        let rhs = ('getarg args 1)
                        let anchor = ('anchor args)
                        spice-quote
                            [('tag `(__drop lhs) anchor)]
                            [('tag `(assign rhs lhs) anchor)]
    # default dereference
    __toptr =
        box-pointer
            spice-macro
                fn (args)
                    let argc = ('argcount args)
                    verify-count argc 1 1
                    let self = ('getarg args 0)
                    if ('refer? ('qualified-typeof self))
                        return ('tag `(reftoptr self) ('anchor args))
                    error "can not convert immutable value to pointer"
    # dynamic typename constructor
    type = `sc_typename_type
    # static typename constructor
    __typecall =
        box-pointer
            spice-macro
                fn "typename.__typecall" (args)
                    let argc = ('argcount args)
                    verify-count argc 1 -1
                    let cls = (as ('getarg args 0) type)
                    if (!= cls typename)
                        hide-traceback;
                        error
                            sc_string_join "typename "
                                sc_string_join ('__repr `cls)
                                    " has no constructor"
                    verify-count argc 2 3
                    let name = (as ('getarg args 1) string)
                    let supertype =
                        if (> argc 2) (as ('getarg args 2) type)
                        else typename
                    'tag `[(sc_typename_type name supertype)] ('anchor args)

let null = (nullof NullType)

# slightly better not - to be replaced further down once more
inline not (value)
    bxor (imply value bool) true

let function->SugarMacro =
    static-typify
        fn "function->SugarMacro" (f)
            bitcast f SugarMacro
        SugarMacroFunction

inline sugar-block-scope-macro (f)
    function->SugarMacro (static-typify f list Scope)

inline sugar-scope-macro (f)
    sugar-block-scope-macro
        fn (topexpr scope)
            let at next = (decons topexpr)
            let at = (as at list)
            let head = ('@ at)
            let anchor = ('anchor head)
            hide-traceback;
            let at scope = (f ('next at) scope)
            return (cons ('tag `at anchor) next) scope

inline sugar-macro (f)
    sugar-block-scope-macro
        fn (topexpr scope)
            let at next = (decons topexpr)
            let at = (as at list)
            let head = ('@ at)
            let anchor = ('anchor head)
            hide-traceback;
            let at = (f ('next at))
            return (cons ('tag `at anchor) next) scope

inline empty? (value)
    == (countof value) 0

let print =
    do
        inline print-element (i key value)
            let value = (view value)
            static-branch (const.icmp<=.i32.i32 i 0)
                inline ()
                inline ()
                    sc_write " "
            static-branch (== (typeof value) string)
                inline ()
                    sc_write value
                inline ()
                    sc_write (repr value)

        inline print (values...)
            va-lifold none print-element values...
            sc_write "\n"

let report =
    spice-macro
        fn (args)
            raising Error
            let anchor = ('__repr `[('anchor args)])
            spice-quote
                print anchor args
                view args

fn extract-integer (value)
    if (== ('kind value) value-kind-const-int)
        return (sc_const_int_extract value)
    error@ ('anchor value) "while extracting integer" "integer constant expected"

'set-symbol integer '__typecall
    box-pointer
        spice-macro
            fn (args)
                raising Error
                let cls = (as ('getarg args 0) type)
                let argc = ('argcount args)
                if (ptrcmp== cls integer)
                    verify-count argc 2 3
                    let size = ('getarg args 1)
                    let size = (extract-integer size)
                    let signed =
                        if (== argc 2) false
                        else (as ('getarg args 2) bool)
                    `[(sc_integer_type (as size i32) signed)]
                else
                    verify-count argc 1 2
                    if (== argc 1)
                        `(nullof cls)
                    else
                        let value = ('getarg args 1)
                        `(as value cls)

'define-symbol real '__typecall
    inline (cls value)
        static-branch (none? value)
            inline () (nullof cls)
            inline ()
                as value cls

'set-symbols string
    __imply =
        box-pointer
            spice-cast-macro
                fn (vT T)
                    let string->rawstring =
                        spice-macro
                            fn (args)
                                let argc = ('argcount args)
                                verify-count argc 1 1
                                let str = ('getarg args 0)
                                if ('constant? str)
                                    let s c = (sc_string_buffer (as str string))
                                    `s
                                else
                                    spice-quote
                                        let s c = (sc_string_buffer str)
                                        s
                    if (ptrcmp== T rawstring)
                        return `string->rawstring
                    `()

# implicit argument type coercion for functions, externs and typed labels
# --------------------------------------------------------------------------

let coerce-call-arguments =
    box-spice-macro
        fn "coerce-call-arguments" (args)
            let argc = ('argcount args)
            verify-count argc 1 -1
            let self = ('getarg args 0)
            let argc = (sub argc 1)
            let fptrT = ('typeof self)
            let fT = ('element@ fptrT 0)
            if ('function? fT)
                let variadic? = ('variadic? fT)
                let pcount = ('element-count fT)
                if (| (& (not variadic?) (== pcount argc))
                      (& variadic? (<= pcount argc)))
                    let outargs = ('tag (sc_call_new self) ('anchor args))
                    sc_call_set_rawcall outargs true
                    loop (i = 0)
                        if (== i argc) (break)
                        let arg = ('getarg args (add i 1))
                        let argT = ('qualified-typeof arg)
                        if (>= i pcount)
                            sc_call_append_argument outargs arg
                        else
                            let paramT = ('element@ fT i)
                            let outarg =
                                if (sc_type_compatible argT paramT) arg
                                else
                                    ('tag `(imply arg paramT) ('anchor arg))
                            sc_call_append_argument outargs outarg
                        + i 1
                    return outargs
            # let prover handle type error
            'tag `(rawcall self [('getarglist args 1)]) ('anchor args)

fn pointer-type-imply? (src dest)
    let ET = ('element@ src 0)
    let ET =
        if ('opaque? ET) ET
        else ('storageof ET)
    let ETkind = ('kind ET)
    # [T x n](*) is interpreted as T(*)
    let ET src =
        if (icmp== ETkind type-kind-array)
            let ET = ('element@ ET 0)
            let src = ('change-element-type src ET)
            _ ET src
        else (_ ET src)
    if (not (icmp== ETkind type-kind-pointer))
        # casts to voidstar are only permitted if we are not holding
        # a ref to another pointer
        if (type== dest voidstar)
            return true
        elseif (type== dest (mutable voidstar))
            if ('writable? src)
                return true
    if (type== dest src)
        return true
    elseif (type== dest ('strip-pointer-storage-class src))
        return true
    elseif (type== dest ('immutable src))
        return true
    elseif (type== dest ('strip-pointer-storage-class ('immutable src)))
        return true
    return false

fn pointer-imply (vT T)
    if (icmp== ('kind T) type-kind-pointer)
        if (pointer-type-imply? vT T)
            return `(inline (self) (bitcast self T))
    `()

fn pointer-as (vT T)
    if (type< T pointer)
        let ST = ('storageof T)
        if (icmp== ('kind ST) type-kind-pointer)
            let vC = ('pointer-storage-class vT)
            let C = ('pointer-storage-class T)
            if (icmp== vC C)
                return `(inline (self) (bitcast self T))
            if (icmp== C unnamed)
                let T = ('change-storage-class T vC)
                return `(inline (self) (bitcast self T))
    elseif (type== T intptr)
        return `(inline (self) (ptrtoint self T))
    `()

fn pointer-ras (T vT)
    if (type== T intptr)
        return `(inline (self) (inttoptr self vT))
    `()

'set-symbols pointer
    __call = coerce-call-arguments
    __imply = (box-pointer (spice-cast-macro pointer-imply))
    __as = (box-pointer (spice-cast-macro pointer-as))
    __ras = (box-pointer (spice-cast-macro pointer-ras))

# infix notation support
# --------------------------------------------------------------------------

fn get-ifx-symbol (name)
    Symbol (.. "#ifx:" (as name string))

fn expand-define-infix (args scope order)
    let prec rest = ('decons args)
    let token rest = ('decons rest)
    let func rest = ('decons rest)
    let prec =
        as prec i32
    let token =
        as token Symbol
    let func =
        if (== ('typeof func) Nothing) token
        else
            as func Symbol
    let scope = ('bind scope `[(get-ifx-symbol token)]
        `[(cons prec (cons order (cons func '())))])
    return none scope

inline make-expand-define-infix (order)
    fn (args scope)
        expand-define-infix args scope order

fn get-ifx-op (env op)
    '@ env `[(get-ifx-symbol (as op Symbol))]

fn has-infix-ops? (infix-table expr)
    # any expression of which one odd argument matches an infix operator
        has infix operations.
    loop (expr = expr)
        if (< (countof expr) 3)
            return false
        let __ expr = ('decons expr)
        let at next = ('decons expr)
        try
            get-ifx-op infix-table at
            return true
        except (err)
            repeat expr

fn unpack-infix-op (op)
    let op = (as op list)
    let op-prec rest = ('decons op)
    let op-order rest = ('decons rest)
    let op-func rest = ('decons rest)
    return
        as op-prec i32
        as op-order Symbol
        as op-func Symbol

inline infix-op (pred)
    fn infix-op (infix-table token prec)
        let op =
            try  (get-ifx-op infix-table token)
            except (err)
                hide-traceback;
                error@ ('anchor token) "while attempting to parse infix token"
                    .. "unexpected token '"
                        .. (tostring token) "' in infix expression"
        let op-prec = (unpack-infix-op op)
        ? (pred op-prec prec) op `none

let infix-op-gt = (infix-op >)
let infix-op-ge = (infix-op >=)

fn rtl-infix-op-eq (infix-table token prec)
    let op =
        try (get-ifx-op infix-table token)
        except (err)
            error@ ('anchor token) "while attempting to parse infix token"
                .. "unexpected token '"
                    .. (tostring token) "' in infix expression"
    let op-prec op-order = (unpack-infix-op op)
    if (== op-order '<)
        ? (== op-prec prec) op `none
    else
        `none

fn parse-infix-expr (infix-table lhs state mprec)
    hide-traceback;
    loop (lhs state = lhs state)
        if (empty? state)
            return lhs state
        let la next-state = ('decons state)
        let op = (infix-op-ge infix-table la mprec)
        if (== ('typeof op) Nothing)
            return lhs state
        let op-prec op-order op-name = (unpack-infix-op op)
        loop (rhs state = ('decons next-state))
            if (empty? state)
                let anchor = ('anchor la)
                break
                    'tag `[(list ('tag `op-name anchor) lhs rhs)] anchor
                    state
            let ra __ = ('decons state)
            let lop = (infix-op-gt infix-table ra op-prec)
            let nextop =
                if (== ('typeof lop) Nothing)
                    rtl-infix-op-eq infix-table ra op-prec
                else lop
            if (== ('typeof nextop) Nothing)
                let anchor = ('anchor la)
                break
                    'tag `[(list ('tag `op-name anchor) lhs rhs)] anchor
                    state
            let nextop-prec = (unpack-infix-op nextop)
            let next-rhs next-state =
                this-function infix-table rhs state nextop-prec
            _ next-rhs next-state

let parse-infix-expr =
    static-typify parse-infix-expr Scope Value list i32

# dotted symbol expander
# --------------------------------------------------------------------------

let dot-char = 46:i8 # "."
let dot-sym = '.

fn dotted-symbol? (env head)
    if (== head dot-sym)
        return false
    let s = (as head string)
    let sz = (countof s)
    loop (i = 0:usize)
        if (== i sz)
            return false
        elseif (== (@ s i) dot-char)
            return true
        + i 1:usize

fn split-dotted-symbol (env name)
    let anchor = ('anchor name)
    let s = (as (as name Symbol) string)
    let sz = (countof s)
    loop (i = sz)
        if (== i 0:usize)
            # did not find a dot - return as-is
            return name
        let _i = i
        let i = (- i 1:usize)
        if (== (@ s i) dot-char)
            # skip trailing dot
            if (== _i sz)
                repeat i
            # if a dot followed this dot, skip it
            if (== (@ s _i) dot-char)
                repeat i
            # ignore prefix dot - return as-is
            if (== i 0:usize)
                return name
            let k = (- i 1:usize)
            # if a dot precedes this dot, skip it
            if (== (@ s k) dot-char)
                repeat i
            # we found a good solo dot inbetween two characters
            let ltoken = (Symbol (lslice s i))
            let rtoken = (Symbol (rslice s _i))
            let infix? =
                try
                    get-ifx-op env ltoken
                    true
                else false
            let manchor = (sc_anchor_offset anchor (as i i32))
            let ranchor = (sc_anchor_offset anchor (as _i i32))
            # build expression
            let ltoken = ('tag `ltoken anchor)
            let expr =
                list
                    'tag `dot-sym manchor
                    if infix?
                        'tag `[(list _ ltoken)] anchor
                    else ltoken
                    'tag `rtoken ranchor
            return ('tag `expr manchor)
        i

#---------------------------------------------------------------------------

# install general list hook for this scope
# is called for every list the expander would otherwise consider a call
fn list-handler (topexpr env)
    let topexpr-at topexpr-next = ('decons topexpr)
    let sxexpr = topexpr-at
    let expr expr-anchor = sxexpr ('anchor sxexpr)
    if (!= ('typeof expr) list)
        return topexpr env
    let expr = (as expr list)
    let expr-at expr-next = ('decons expr)
    let head-key = expr-at
    let head =
        try
            '@ env `[(as head-key Symbol)]
        except (err) head-key
    let head =
        try
            '@ (as head type) '__macro
        except (err) head
    if (== ('typeof head) SugarMacro)
        let head = (as head SugarMacro)
        let expr env =
            try
                hide-traceback;
                head topexpr env
            except (err)
                hide-traceback;
                let msg = `"while expanding sugar macro"
                sc_error_append_calltrace err ('tag msg expr-anchor)
                raise err
        return expr env
    elseif (has-infix-ops? env expr)
        let at next = ('decons expr)
        let expr =
            try
                hide-traceback;
                parse-infix-expr env at next 0
            except (err)
                hide-traceback;
                error@+ err ('anchor topexpr-at) "while expanding infix expression"
        return (cons expr topexpr-next) env
    else
        return topexpr env

# install general symbol hook for this scope
# is called for every symbol the expander could not resolve
fn symbol-handler (topexpr env)
    let at next = ('decons topexpr)
    let sxname = at
    let name = (as sxname Symbol)
    let s = (as name string)
    if (>= (countof s) 2:usize)
        let ch = (@ s 0)
        switch ch
        #pass 126:i8 # ~
        pass 64:i8 # @
        #pass 47:i8 # /
        pass 38:i8 # &
        pass 45:i8 # -
        do
            # split
            let anchor = ('anchor sxname)
            let lop = ('tag `[(Symbol (lslice s 1))] anchor)
            let rop = ('tag `[(Symbol (rslice s 1))] (sc_anchor_offset anchor 1))
            return
                cons
                    'tag `[(list lop rop)] anchor
                    next
                env
        default
            ;
    if (dotted-symbol? env name)
        let expr =
            split-dotted-symbol env sxname
        return (cons expr next) env
    label skip
        let handler =
            try ('@ env `typed-symbol-handler-symbol)
            except (err)
                merge skip
        return
            cons
                'tag `(handler sxname env) ('anchor sxname)
                next
            env
    return topexpr env

fn quasiquote-list
inline quasiquote-any (x)
    let T = ('typeof x)
    let anchor = ('anchor x)
    if (== T list)
        quasiquote-list (as x list)
    else
        list ('tag `sc_valueref_tag anchor)
            ('tag `anchor anchor)
            list ('tag `sugar-quote anchor) x
fn quasiquote-list (x)
    if (empty? x)
        return (list sugar-quote x)
    let aat next = ('decons x)
    let at = aat
    let anchor = ('anchor at)
    let T = ('typeof at)
    if (== T list)
        let at = (as at list)
        if (not (empty? at))
            let at-at at-next = ('decons at)
            if (== ('typeof at-at) Symbol)
                let at-at = (as at-at Symbol)
                if (== at-at 'unquote-splice)
                    return
                        list `sc_list_join
                            cons ('tag `do anchor) at-next
                            quasiquote-list next
                elseif (== at-at 'square-list)
                    if (> (countof at-next) 1)
                        return
                            list `sc_list_join
                                list ('tag `list anchor) (cons ('tag `_ anchor) at-next)
                                quasiquote-list next
    elseif (== T Symbol)
        let at = (as at Symbol)
        if (== at 'unquote)
            return (cons ('tag `do anchor) next)
        elseif (== at 'square-list)
            return (cons ('tag `do anchor) next)
        elseif (== at 'quasiquote)
            return (quasiquote-list (quasiquote-list next))
    let val = (quasiquote-any aat)
    list cons ('tag `val anchor) (quasiquote-list next)

fn expand-and-or (expr f)
    if (empty? expr)
        error "at least one argument expected"
    elseif (== (countof expr) 1)
        return ('@ expr)
    let expr = ('reverse expr)
    loop (result head = ('decons expr))
        if (empty? head)
            return result
        let at next = ('decons head)
        _ `[(list f (list inline '() result) at)] next

inline make-expand-and-or (f)
    fn (expr)
        expand-and-or expr f

fn ltr-multiop (args target mincount)
    let argc = ('argcount args)
    verify-count argc mincount -1
    'tag
        if (<= argc mincount)
            `(target args)
        else
            # call for multiple args
            let lhs = ('getarg args 0)
            loop (i lhs = 1 lhs)
                let rhs = ('getarg args i)
                let op = `(target lhs rhs)
                let i = (+ i 1)
                if (== i argc)
                    break op
                _ i op
        'anchor args

fn rtl-multiop (args target mincount)
    let argc = ('argcount args)
    verify-count argc mincount -1
    'tag
        if (<= argc mincount)
            `(target args)
        else
            # call for multiple args
            let lasti = (- argc 1)
            let rhs = ('getarg args lasti)
            loop (i rhs = lasti rhs)
                let i = (- i 1)
                let lhs = ('getarg args i)
                let op = `(target lhs rhs)
                if (== i 0)
                    break op
                _ i op
        'anchor args

# extracting options from varargs

# (va-option-branch key elsef args...)
fn va-option-branch (args)
    let argc = ('argcount args)
    verify-count argc 2 -1
    let key elsef =
        'getarg args 0
        'getarg args 1
    let key = (unbox-symbol key Symbol)
    loop (i = 2)
        if (== i argc)
            break;
        let arg = ('getarg args i)
        let argkey = ('keyof ('qualified-typeof arg))
        if (== key argkey)
            return
                sc_keyed_new unnamed arg
        + i 1
    `(elsef)

# modules
####

""""A symbol table of type `Scope` which holds configuration options and module
    contents. It is managed by the module import system.

    `package.path` holds a list of all search paths in the form of simple
    string patterns. Changing it alters the way modules are searched for in
    the next run stage.

    `package.modules` is another scope symbol table mapping full module
    paths to their contents. When a module is first imported, its contents
    are cached in this table. Subsequent imports of the same module will be
    resolved to these cached contents.
let package = (sc_typename_type "scopes.package" typename)
'set-symbols package
    path =
        Value
            list
                .. compiler-dir "/lib/scopes/?.sc"
                .. compiler-dir "/lib/scopes/?/init.sc"
    modules = `[(Scope)]

fn clone-scope-contents (a b)
    """"Join two scopes `a` and `b` into a new scope so that the
        root of `a` descends from `b`.
    # search first upwards for the root scope of a, then clone a
        piecewise with the cloned scopes as parents
    let parent = ('parent a)
    if (== parent (nullof Scope))
        return ('reparent a b)
    'reparent a
        this-function parent b

'set-symbols Scope
    __.. = (box-pointer (simple-binary-op clone-scope-contents))

fn extract-single-arg (args)
    let argc = ('argcount args)
    verify-count argc 1 1
    'getarg args 0

fn extract-single-type-arg (args)
    let value = (extract-single-arg args)
    if (== ('typeof value) type)
        as value type
    else
        'qualified-typeof value

inline make-const-value-property-function (func)
    spice-macro
        fn (args)
            let value = (extract-single-arg args)
            let val = (func value)
            `val

inline make-const-type-property-function (func)
    spice-macro
        fn (args)
            let val = (extract-single-type-arg args)
            let val = (func val)
            `val

let
    constant? =
        spice-macro
            fn "constant?" (args)
                let value = (extract-single-arg args)
                `[('constant? value)]
    signed? =
        make-const-type-property-function
            fn (T)
                if (== ('kind T) type-kind-integer)
                    'signed? T
                else
                    hide-traceback;
                    error "integer type expected"
    unsized? =
        make-const-type-property-function sc_type_is_unsized
    storageof = (make-const-type-property-function sc_type_storage)
    superof = (make-const-type-property-function sc_typename_type_get_super)
    sizeof = (make-const-type-property-function sc_type_sizeof)
    bitcountof = (make-const-type-property-function sc_type_bitcountof)
    alignof = (make-const-type-property-function sc_type_alignof)
    unqualified = (make-const-type-property-function sc_strip_qualifiers)
    qualifiersof = (make-const-value-property-function sc_value_qualified_type)
    keyof = (make-const-type-property-function sc_type_key)
    uniqueof =
        spice-macro
            fn (args)
                let argc = ('argcount args)
                verify-count argc 2 2
                let T = ('getarg args 0)
                let index = (as ('getarg args 1) i32)
                let T =
                    if (== ('typeof T) type)
                        as T type
                    else
                        'qualified-typeof T
                `[(sc_unique_type T index)]
    viewof =
        spice-macro
            fn (args)
                let argc = ('argcount args)
                verify-count argc 1 -1
                let T = ('getarg args 0)
                let T =
                    if (== ('typeof T) type)
                        as T type
                    else
                        'qualified-typeof T
                let T = (sc_view_type T -1)
                loop (T i = T 1)
                    if (== i argc)
                        break `T
                    let index = (as ('getarg args i) i32)
                    repeat (sc_view_type T index) (add i 1)
    returnof =
        make-const-type-property-function
            fn (T)
                let T =
                    if ('function-pointer? T) ('element@ T 0)
                    elseif ('function? T) T
                    else
                        hide-traceback;
                        error "function type expected"
                'return-type T
    offsetof =
        spice-macro
            fn (args)
                let argc = ('argcount args)
                verify-count argc 2 2
                let value = ('getarg args 0)
                let T =
                    if (== ('typeof value) type)
                        as value type
                    else
                        'qualified-typeof value
                let index = ('getarg args 1)
                let index =
                    if (== ('typeof index) Symbol)
                        sc_type_field_index T (as index Symbol)
                    else
                        as index i32
                let offset = (sc_type_offsetof T index)
                `offset

#del extract-single-arg
#del make-const-type-property-function

let Closure->Accessor =
    spice-macro
        fn "Closure->Accessor" (args)
            let argc = ('argcount args)
            verify-count argc 1 1
            let self = ('getarg args 0)
            if (not ('constant? self))
                error "Closure must be constant"
            let self = (as self Closure)
            let self = (bitcast self Accessor)
            `self

let Closure->Generator =
    spice-macro
        fn "Closure->Generator" (args)
            let argc = ('argcount args)
            verify-count argc 1 1
            let self = ('getarg args 0)
            if (not ('constant? self))
                error "Closure must be constant"
            let self = (as self Closure)
            let self = (bitcast self Generator)
            `self

let Closure->Collector =
    spice-macro
        fn "Closure->Collector" (args)
            let argc = ('argcount args)
            verify-count argc 1 1
            let self = ('getarg args 0)
            if (not ('constant? self))
                error "Closure must be constant"
            let self = (as self Closure)
            let self = (bitcast self Collector)
            `self

# (define name expr ...)
fn expand-define (expr)
    raising Error
    let defname = ('@ expr)
    let content = ('next expr)
    list let defname '=
        cons do content

let
    qq =
        sugar-macro
            fn (args)
                if (== (countof args) 1)
                    quasiquote-any ('@ args)
                else
                    quasiquote-list args
    # dot macro
    # (. value symbol ...)
    . =
        sugar-macro
            fn (args)
                fn op (a b)
                    let sym = (as b Symbol)
                    list getattr a (list sugar-quote sym)
                let a rest = ('decons args)
                let b rest = ('decons rest)
                loop (rest result = rest (op a b))
                    if (empty? rest)
                        break result
                    let c rest = ('decons rest)
                    _ rest (op result c)
    and = (sugar-macro (make-expand-and-or and-branch))
    or = (sugar-macro (make-expand-and-or or-branch))
    define = (sugar-macro expand-define)
    define-infix> = (sugar-scope-macro (make-expand-define-infix '>))
    define-infix< = (sugar-scope-macro (make-expand-define-infix '<))
    .. = (spice-macro (fn (args) (rtl-multiop args `.. 2)))
    + = (spice-macro (fn (args) (ltr-multiop args `+ 2)))
    * = (spice-macro (fn (args) (ltr-multiop args `* 2)))
    @ = (spice-macro (fn (args) (ltr-multiop args `@ 1)))
    | = (spice-macro (fn (args) (ltr-multiop args `| 2)))
    & = (spice-macro (fn (args) (ltr-multiop args `& 1)))
    va-option-branch = (spice-macro va-option-branch)
    sugar-set-scope! =
        sugar-scope-macro
            fn (args sugar-scope)
                raising Error
                let scope rest = (decons args)
                return none
                    as scope Scope

inline select-op-macro (sop uop fop numargs)
    inline scalar-type (T)
        let ST = ('storageof T)
        if (type== ('superof ST) vector)
            'element@ ST 0
        else ST
    spice-macro
        fn (args)
            let argc = ('argcount args)
            verify-count argc numargs numargs
            let a b =
                'getarg args 0; 'getarglist args 1
            let T = (scalar-type ('typeof a))
            let fun =
                if (type== ('superof T) integer)
                    if ('signed? T) `sop
                    else `uop
                elseif (type== ('superof T) real) `fop
                else
                    error
                        sc_string_join "invalid argument type: "
                            sc_string_join (sc_value_repr (box-pointer T))
                                ". integer or real vector or scalar expected"
            `(fun a b)

let sabs =
    spice-macro
        fn (args)
            let argc = ('argcount args)
            verify-count argc 1 1
            let arg = ('getarg args 0)
            let T = ('storageof ('typeof arg))
            if (not (< T integer))
                error "integer expected"
            let bits = ('bitcount T)
            let shift = (sc_const_int_new T (as (- bits 1) u64))
            spice-quote
                let mask = (ashr arg shift)
                sub (bxor arg mask) mask

let pow = **
let abs = (select-op-macro sabs _ fabs 1)
let sign = (select-op-macro ssign ssign fsign 1)

let hash = (sc_typename_type "hash" typename)
'set-plain-storage hash u64

# semi-final `not` - this one folds the constant
    further down you'll find the sugar for not
let not =
    spice-macro
        fn (args)
            let argc = ('argcount args)
            verify-count argc 1 1
            let value = ('getarg args 0)
            let conv = (imply-converter ('typeof value) bool ('constant? value))
            let value =
                if (operator-valid? conv)
                    hide-traceback;
                    sc_prove ('tag `(conv value) ('anchor value))
                else value
            if ('constant? value)
                `[(not (unbox-integer value bool))]
            else
                `(not value)

let list-handler =
    box-pointer (static-typify list-handler list Scope)
let symbol-handler =
    box-pointer (static-typify symbol-handler list Scope)
indirect-let list-handler-symbol = list-handler
indirect-let symbol-handler-symbol = symbol-handler

run-stage; # 5

inline make-inplace-let-op (op)
    sugar-macro
        fn expand-infix-let (expr)
            raising Error
            let name value = (decons expr 2)
            qq [let] [name] = ([op] [name] [value])

inline make-inplace-op (op)
    inline (lhs rhs)
        = lhs (op lhs rhs)

let
    -= = (make-inplace-op -)
    += = (make-inplace-op +)
    *= = (make-inplace-op *)
    /= = (make-inplace-op /)
    //= = (make-inplace-op //)
    %= = (make-inplace-op %)
    >>= = (make-inplace-op >>)
    <<= = (make-inplace-op <<)
    &= = (make-inplace-op &)
    |= = (make-inplace-op |)
    ^= = (make-inplace-op ^)
    ..= = (make-inplace-op ..)

    := =
        sugar-macro
            fn expand-infix-let (expr)
                raising Error
                let name value = (decons expr 2)
                qq [let] [name] = [value]
    as:= = (make-inplace-let-op as)
    <- =
        sugar-macro
            fn expand-apply (expr)
                raising Error
                let f args = (decons expr 2)
                qq ([f] [args])
    <-: =
        sugar-macro
            fn expand-apply (expr)
                raising Error
                let ret args = (decons expr 2)
                if (== ('typeof args) Nothing)
                    let ret = (as ret list)
                    qq ([function] [void] (unquote-splice ret))
                else
                    let args = (as args list)
                    qq ([function] [ret] (unquote-splice args))

#define-infix< 40 , _

define-infix< 50 -> inline
define-infix< 50 =
define-infix< 50 +=; define-infix< 50 -=; define-infix< 50 *=; define-infix< 50 /=
define-infix< 50 //=; define-infix< 50 %=
define-infix< 50 >>=; define-infix< 50 <<=
define-infix< 50 &=; define-infix< 50 |=; define-infix< 50 ^=
define-infix< 50 ..=

define-infix< 50 :=
define-infix< 50 as:=

define-infix> 100 or
define-infix> 200 and

define-infix> 300 <
define-infix> 300 >
define-infix> 300 <=
define-infix> 300 >=
define-infix> 300 !=
define-infix> 300 ==
define-infix> 300 in

define-infix> 340 |
define-infix> 350 ^
define-infix> 360 &

define-infix< 400 ..
define-infix> 450 <<
define-infix> 450 >>
define-infix> 500 -
define-infix> 500 +
define-infix> 600 %
define-infix> 600 mod
define-infix> 600 /
define-infix> 600 //
define-infix> 600 *
define-infix< 700 ** pow
define-infix> 750 as
define-infix> 780 :
define-infix> 800 .
define-infix> 800 @
define-infix> 800 <-
define-infix> 800 <-:
define-infix> 800 raises

# (va-option key args... else-body)
let va-option =
    sugar-macro
        fn (args)
            let key va body = (decons args 2)
            let sym = (as key Symbol)
            list va-option-branch (list sugar-quote sym)
                cons inline '() body
                va

#---------------------------------------------------------------------------
# collector
#---------------------------------------------------------------------------

'set-symbols Collector
    __typecall =
        inline "Collector-new" (cls init valid? at collect)
            Closure->Collector
                inline "get-init" ()
                    _ init valid? at collect
    __call =
        spice-macro
            fn (args)
                let argc = ('argcount args)
                verify-count argc 1 1
                let self = ('getarg args 0)
                if (not ('constant? self))
                    error "Generator must be constant"
                let self = (self as Collector)
                let self = (bitcast self Closure)
                `(self)

#---------------------------------------------------------------------------
# for iterator
#---------------------------------------------------------------------------

'set-symbols Generator
    __typecall =
        inline "Generator-new" (cls start valid? at next)
            """"Takes four functions `start`, `valid?`, `at` and `next`
                and returns a new generator ready for use.
            Closure->Generator
                inline "get-iter-init" ()
                    _ start valid? at next
    __call =
        spice-macro
            fn (args)
                let argc = ('argcount args)
                verify-count argc 1 1
                let self = ('getarg args 0)
                if (not ('constant? self))
                    error "Generator must be constant"
                let self = (self as Generator)
                let self = (bitcast self Closure)
                `(self)

'set-docstring Generator '__call
    """"*spice*{.property} `__call`{.descname} (*&ensp;self&ensp;*)[](#scopes.Generator.spice.__call "Permalink to this definition"){.headerlink} {#scopes.Generator.spice.__call}

        :   Returns, in this order, the four functions `start`, `valid?`,
            `init` and `next` which are required to enumerate generator
            `self`.

# typical pattern for a generator:
    inline make-generator (container)
        Generator
            inline "start" ()
                # return the first iterator of sequence (might not be valid)
                'start container
            inline "valid?" (it...)
                # return true if the iterator is still valid
                'valid-iterator? container it...
            inline "at" (it...)
                # return variadic result at iterator
                '@ container it...
            inline "next" (it...)
                # return the next iterator in sequence
                'next container it...

fn next-head? (next)
    if (not (empty? next))
        let expr next = (decons next)
        if (('typeof expr) == list)
            let at = ('@ (expr as list))
            if (('typeof at) == Symbol)
                return (at as Symbol) ('anchor at)
    _ unnamed unknown-anchor

""""*sugar*{.property} (`for`{.descname} *&ensp;name ...&ensp;* `in`{.descname} *&ensp;gen body...&ensp;*) [](#scopes.sugar.for-name-in-gen-body "Permalink to this definition"){.headerlink} {#scopes.sugar.for-name-in-gen-body}

    :   Defines a loop that enumerates all elements in collection or sequence
        `gen`, unpacking each element and binding its arguments to the names
        defined by `name ...`.

        `gen` must either be of type `Generator` or provide a cast to
        `Generator`.

        Within the loop body, special forms `break` and `continue` can be used
        to abort the loop early or skip ahead to the next element. The loop
        will always evaluate to no arguments.

        For a loop form that allows maintaining additional state and break
        with a value, see `fold`.

        Usage example:

            :::scopes
            # print numbers from 0 to 9, skipping number 5
            for i in (range 100)
                if (i == 10)
                    # abort the loop
                    break;
                if (i == 5)
                    # skip this index
                    continue;
                print i
define for
    sugar-block-scope-macro
        fn "expand-for" (topexpr scope)
            let expr next-expr = (decons topexpr)
            let else-head else-head-anchor = (next-head? next-expr)
            let has-else? = (else-head == 'else)
            let else-body next-expr =
                if has-else?
                    let at next-expr = (decons next-expr)
                    let block = (at as list)
                    let at block = (decons block)
                    _ block next-expr
                else
                    _ '() next-expr
            let expr = (expr as list)
            let head args = (decons expr)
            let it params =
                loop (it params = args '())
                    if (empty? it)
                        error "'in' expected"
                    let sxat it = (decons it)
                    let at = (sxat as Symbol)
                    if (at == 'in)
                        break it params
                    _ it (cons sxat params)
            let generator-expr body = (decons it)
            let subscope = (Scope scope)
            let generator-expr-anchor = ('anchor generator-expr)
            let generator-expr _next subscope = (sc_expand generator-expr '() subscope)
            spice-quote
                let start valid? at next =
                    (as generator-expr Generator);
            let result =
                cons
                    spice-quote start valid? at next # order expressions
                        loop (it... = (start))
                            if (valid? it...)
                                let args... = (at it...)
                                inline continue ()
                                    spice-unquote
                                        'tag
                                            spice-quote
                                                repeat (next it...)
                                            generator-expr-anchor
                                spice-unquote
                                    let expr =
                                        loop (params expr = params (list '= args...))
                                            if (empty? params)
                                                break expr
                                            let param next = (decons params)
                                            _ next (cons param expr)
                                    let expr = (cons let expr)
                                    let subscope =
                                        'bind subscope 'continue continue
                                    let value = (sc_expand (cons do expr body) '() subscope)
                                    'tag value ('anchor head)
                                continue;
                            else
                                spice-unquote
                                    if has-else?
                                        let value = (sc_expand (cons do else-body) '() subscope)
                                        'tag `(break [value]) else-head-anchor
                                    else
                                        `(break)
                    next-expr
            return result scope

#---------------------------------------------------------------------------
# hashing
#---------------------------------------------------------------------------

let hash-storage =
    spice-macro
        fn "hash-storage" (args)
            let argc = ('argcount args)
            verify-count argc 1 1
            let value = ('getarg args 0)
            let OT = ('typeof value)
            let T =
                if ('opaque? OT) OT
                else ('storageof OT)
            let bits = ('bitcount T)
            if (bits <= 64)
                let conv_u64 =
                    switch ('kind T)
                    case type-kind-integer
                        `(zext (bitcast value T) u64)
                    case type-kind-pointer
                        `(ptrtoint value u64)
                    default
                        if (type== T f32)
                            `(zext (bitcast value u32) u64)
                        elseif (type== T f64)
                            `(bitcast value u64)
                        else
                            error
                                .. "can't hash storage of type " (repr OT)
                `(bitcast (sc_hash conv_u64 [('sizeof T)]) hash)
            else
                let chunk-count = ((bits + (64 - 1)) // 64)
                let first-chunk = `(sc_hash (itrunc value u64) [('sizeof T)])
                let hash-chain =
                    loop (chunk-index computed = 1 first-chunk)
                        if (chunk-index == chunk-count)
                            break computed
                        let chunk =
                            `(sc_hash (itrunc (value >> (64 * chunk-index)) u64) [('sizeof T)])
                        _ (chunk-index + 1) `(sc_hash2x64 computed chunk)

                `(bitcast hash-chain hash)


'set-symbols hash
    __hash = (inline (self) self)
    __== = integer.__==
    __!= = integer.__!=
    __as =
        spice-cast-macro
            fn "hash-as" (vT T)
                let ST = ('storageof vT)
                if (T == ST)
                    return `(inline (self) (bitcast self T))
                elseif (T == integer)
                    return `(inline (self) (bitcast self ST))
                `()
    __ras =
        spice-cast-macro
            fn "hash-as" (vT T)
                if (vT == ('storageof vT))
                    return `(inline (self) (bitcast self T))
                `()
    __typecall =
        do
            inline hash2 (a b)
                bitcast
                    sc_hash2x64
                        bitcast (hash1 a) u64
                        bitcast (hash1 b) u64
                    hash
            spice-macro
                fn "hash-typecall" (args)
                    let argc = ('argcount args)
                    verify-count argc 2 -1
                    let value = ('getarg args 1)
                    if (argc == 2)
                        `(hash1 value)
                    else
                        ltr-multiop ('getarglist args 1) hash2 2
    from-bytes =
        inline "hash.from-bytes" (data size)
            bitcast (sc_hashbytes data size) hash

'set-symbols Nothing
    __hash =
        inline "Nothing.__hash" (self) (nullof hash)

va-lfold none
    inline (key T)
        'set-symbol T '__hash hash-storage
    \ integer pointer real type Closure Builtin Symbol string Scope

#---------------------------------------------------------------------------
# module loading
#---------------------------------------------------------------------------

let wrap-if-not-run-stage =
    spice-macro
        fn (args)
            raising Error
            let argc = ('argcount args)
            if (argc == 1)
                let arg = ('getarg args 0)
                if (('typeof arg) == CompileStage)
                    return arg
            ``args

let incomplete = (typename "incomplete")

run-stage; # 6

let question-mark-char = 63:i8 # "?"
fn make-module-path (pattern name)
    let sz = (countof pattern)
    loop (i start result = 0:usize 0:usize "")
        if (i == sz)
            return (.. result (rslice pattern start))
        if ((@ pattern i) != question-mark-char)
            repeat (i + 1:usize) start result
        else
            repeat (i + 1:usize) (i + 1:usize)
                .. result (rslice (lslice pattern i) start) name

fn exec-module (expr eval-scope)
    let ModuleFunctionType = (pointer (raises (function Value) Error))
    let StageFunctionType = (pointer (raises (function CompileStage) Error))
    let expr-anchor = ('anchor expr)
    let f =
        do
            hide-traceback;
            sc_eval expr-anchor (expr as list) eval-scope
    loop (f expr-anchor = f expr-anchor)
        # build a wrapper
        let wrapf =
            spice-quote
                fn "exec-module-stage" ()
                    raising Error
                    hide-traceback;
                    wrap-if-not-run-stage (f)
        let path =
            .. ((sc_anchor_path expr-anchor) as string) ":"
                tostring `[(sc_anchor_lineno expr-anchor)]
        sc_template_set_name wrapf (Symbol path)
        let wrapf = (sc_typify_template wrapf 0 (undef TypeArrayPointer))
        let f =
            do
                hide-traceback;
                sc_compile wrapf
                    compile-flag-cache
                    # can't use this flag yet because it breaks code
                    #| compile-flag-cache compile-flag-O2
        if (('typeof f) == StageFunctionType)
            let fptr = (f as StageFunctionType)
            let result =
                do
                    hide-traceback;
                    fptr;
            let result = (bitcast result Value)
            repeat result ('anchor result)
        else
            let fptr = (f as ModuleFunctionType)
            let result =
                do
                    hide-traceback;
                    fptr;
            break result

let slash-char = 47:i8 # "/"
let backslash-char = 92:i8 # "\"
fn dots-to-slashes (pattern)
    let sz = (countof pattern)
    loop (i start result = 0:usize 0:usize "")
        if (i == sz)
            return (.. result (rslice pattern start))
        let c = (@ pattern i)
        if (c == slash-char)
            error
                .. "no slashes permitted in module name: " pattern
        elseif (c == backslash-char)
            error
                .. "no slashes permitted in module name: " pattern
        elseif (c != dot-char)
            repeat (i + 1:usize) start result
        elseif (icmp== (i + 1:usize) sz)
            error
                .. "invalid dot at ending of module '" pattern "'"
        else
            if (icmp== i start)
                if (icmp>u start 0:usize)
                    repeat (i + 1:usize) (i + 1:usize)
                        .. result (rslice (lslice pattern i) start) "../"
            repeat (i + 1:usize) (i + 1:usize)
                .. result (rslice (lslice pattern i) start) "/"

fn load-module (module-name module-path opts...)
    if (not (sc_is_file module-path))
        hide-traceback;
        error
            .. "no such module: " module-path
    let module-path = (sc_realpath module-path)
    let module-dir = (sc_dirname module-path)
    let expr =
        do
            hide-traceback;
            sc_parse_from_path module-path
    let eval-scope =
        'bind-symbols
            va-option scope opts...
                do
                    sc_scope_new_subscope_with_docstring (sc_get_globals) ""
            main-module? =
                va-option main-module? opts... false
            module-path = module-path
            module-dir = module-dir
            module-name = module-name
    try
        hide-traceback;
        exec-module expr (Scope eval-scope)
    except (err)
        hide-traceback;
        error@+ err unknown-anchor
            "while loading module " .. module-path

fn patterns-from-namestr (base-dir namestr)
    # if namestr starts with a slash (because it started with a dot),
        we only search base-dir
    if ((@ namestr 0:usize) == slash-char)
        list
            .. base-dir "?.sc"
            .. base-dir "?/init.sc"
    else
        ('@ package 'path) as list

inline slice (value start end)
    rslice (lslice value end) start

fn find-module-path (base-dir name)
    #assert-typeof name Symbol
    let namestr = (dots-to-slashes (name as string))
    let all-patterns = (patterns-from-namestr base-dir namestr)
    loop (patterns = all-patterns)
        if (empty? patterns)
            hide-traceback;
            error
                .. "failed to find module '" (repr name) "'\n"
                    \ "no such module '" (as name string) "' in paths:"
                    loop (patterns str = all-patterns "")
                        if (empty? patterns)
                            break str
                        let pattern patterns = (decons patterns)
                        let pattern = (pattern as string)
                        let module-path = (make-module-path pattern namestr)
                        repeat patterns
                            .. str "\n"  "    " module-path
        let pattern patterns = (decons patterns)
        let pattern = (pattern as string)
        let module-path = (sc_realpath (make-module-path pattern namestr))
        if (empty? module-path)
            repeat patterns
        if (not (sc_is_file module-path))
            repeat patterns
        return module-path

fn require-from (base-dir name)
    #assert-typeof name Symbol
    let namestr = (dots-to-slashes (name as string))
    let all-patterns = (patterns-from-namestr base-dir namestr)
    loop (patterns = all-patterns)
        if (empty? patterns)
            hide-traceback;
            error
                .. "failed to import module '" (repr name) "'\n"
                    \ "no such module '" (as name string) "' in paths:"
                    loop (patterns str = all-patterns "")
                        if (empty? patterns)
                            break str
                        let pattern patterns = (decons patterns)
                        let pattern = (pattern as string)
                        let module-path = (make-module-path pattern namestr)
                        repeat patterns
                            .. str "\n"  "    " module-path
        let pattern patterns = (decons patterns)
        let pattern = (pattern as string)
        let module-path = (sc_realpath (make-module-path pattern namestr))
        if (empty? module-path)
            repeat patterns
        let module-path-sym = (Symbol module-path)
        fn get-modules () (('@ package 'modules) as Scope)
        fn get-modules-path (symbol) ('@ (get-modules) symbol)
        fn set-modules-path (symbol value)
            'set-symbol package 'modules
                'bind (get-modules) symbol value
        let content =
            try (get-modules-path module-path-sym)
            except (err)
                if (not (sc_is_file module-path))
                    repeat patterns
                set-modules-path module-path-sym incomplete
                let content =
                    do
                        hide-traceback;
                        load-module (name as string) module-path
                set-modules-path module-path-sym content
                return content
        if (('typeof content) == type)
            if (content == incomplete)
                error
                    .. "trying to import module " (repr name)
                        " while it is being imported"
        return content

let import =
    sugar-scope-macro
        fn "import" (args scope)
            fn resolve-scope (scope namestr start)
                let sz = (countof namestr)
                loop (i start = start start)
                    if (i == sz)
                        return (Symbol (slice namestr start i))
                    if ((@ namestr i) == dot-char)
                        if (i == start)
                            repeat (add i 1:usize) (add i 1:usize)
                    repeat (add i 1:usize) start
            let sxname rest = (decons args)
            let name = (sxname as Symbol)
            let namestr = (name as string)
            let module-dir = (('@ scope 'module-dir) as string)
            let key = (resolve-scope scope namestr 0:usize)
            let module =
                do
                    hide-traceback;
                    require-from module-dir name
            _ module
                'bind scope key module

#---------------------------------------------------------------------------
# using
#---------------------------------------------------------------------------

fn merge-scope-symbols (source target filter)
    fn process-keys (source target filter)
        loop (last-index target = -1 target)
            let key value index = ('next source last-index)
            if (index < 0)
                break target
            else
                if
                    or
                        none? filter
                        and (('typeof key) == Symbol)
                            do
                                let keystr = (key as Symbol as string)
                                let ok = ('match? filter keystr)
                                ok
                    repeat index
                        'bind target key value
                else
                    repeat index target
    fn filter-contents (source target filter)
        let parent = ('parent source)
        if (parent == null)
            return
                process-keys source target filter
        process-keys source
            this-function parent target filter
            filter
    filter-contents source target filter

let using =
    sugar-scope-macro
        fn "using" (args sugar-scope)
            let name rest = (decons args)
            let nameval = name
            if ((('typeof nameval) == Symbol) and ((nameval as Symbol) == 'import))
                let module-dir = (('@ sugar-scope 'module-dir) as string)
                let name rest = (decons rest)
                let name = (name as Symbol)
                hide-traceback;
                let module = ((require-from module-dir name) as Scope)
                return (list)
                    .. module sugar-scope

            let pattern =
                if (empty? rest)
                    '()
                else
                    let token pattern rest = (decons rest 2)
                    let token = (token as Symbol)
                    if (token != 'filter)
                        error
                            "syntax: using <scope> [filter <filter-string>]"
                    let value = ((sc_expand pattern rest sugar-scope) as string)
                    list value
            # attempt to import directly if possible
            inline process (src)
                _ (list do)
                    if (empty? pattern)
                        merge-scope-symbols src sugar-scope none
                    else
                        merge-scope-symbols src sugar-scope (('@ pattern) as string)
            let nameval = (sc_expand nameval '() sugar-scope)
            if (('typeof nameval) == Scope)
                return (process (nameval as Scope))
            let nameval = (sc_prove nameval)
            if (not ('constant? nameval))
                hide-traceback;
                error "argument passed to `using` must be constant at sugar time"
            let nameval =
                if (('typeof nameval) == type)
                    hide-traceback;
                    '@ (nameval as type) '__using
                else nameval
            if (('typeof nameval) == Scope)
                return (process (nameval as Scope))
            hide-traceback;
            error "using: scope expected"
            #return
                list run-stage
                    cons merge-scope-symbols name 'sugar-scope pattern
                sugar-scope

# (define-macro name expr ...)
# implies builtin names:
    args : list
define define-sugar-macro
    sugar-macro
        fn "expand-define-sugar-macro" (expr)
            raising Error
            let name body = (decons expr)
            list define name
                list sugar-macro
                    cons fn '(args)
                        list raising Error
                        body

let __static-assert =
    spice-macro
        fn "__static-assert" (args)
            let argc = ('argcount args)
            verify-count argc 2 2
            let expr msg =
                'getarg args 0
                'getarg args 1
            let msg = (msg as string)
            let val = (expr as bool)
            if (not val)
                hide-traceback;
                error
                    .. "assertion failed: " msg
            `()

let __assert =
    spice-macro
        fn "__assert" (args)
            inline check-assertion (result anchor msg)
                if (not result)
                    print anchor
                        .. "assertion failed: " msg
                    sc_set_signal_abort true
                    sc_abort;

            let argc = ('argcount args)
            verify-count argc 2 2
            let expr msg =
                'getarg args 0
                'getarg args 1
            if (('typeof msg) != string)
                error "string expected as second argument"
            let anchor = ('anchor args)
            'tag `(check-assertion expr anchor msg) anchor

fn gen-vector-reduction (f v sz)
    returning Value
    loop (v sz = v sz)
        # special cases for low vector sizes
        switch sz
        case 1
            break
                spice-quote
                    extractelement v 0
        case 2
            break
                spice-quote
                    f (extractelement v 0) (extractelement v 1)
        case 3
            break
                spice-quote
                    f (f (extractelement v 0) (extractelement v 1))
                        extractelement v 2
        case 4
            break
                spice-quote
                    f
                        f (extractelement v 0) (extractelement v 1)
                        f (extractelement v 2) (extractelement v 3)
        default
            if ((sz & 1) == 0)
                # clean pow2 slice
                let hsz = (sz >> 1)
                let hsz-value = (hsz as usize)
                repeat
                    spice-quote
                        f
                            lslice v hsz-value
                            rslice v hsz-value
                    hsz
            else
                # split into even sum and 1
                let rhs = `(rslice v 1)
                let rhs = (this-function f rhs (sz - 1))
                break `(f (extractelement v 0) rhs)

let vector-reduce =
    spice-macro
        fn (args)
            let argc = ('argcount args)
            verify-count argc 2 2
            let f v =
                'getarg args 0
                'getarg args 1
            let T = ('typeof v)
            let sz = ('element-count T)
            gen-vector-reduction f v sz

let __countof-aggregate =
    spice-macro
        fn (args)
            let argc = ('argcount args)
            verify-count argc 1 1
            let self = ('getarg args 0)
            let T = ('typeof self)
            let sz = ('element-count T)
            `[(sz as usize)]

let key =
    spice-macro
        fn (args)
            let argc = ('argcount args)
            verify-count argc 2 2
            let sym = (('getarg args 0) as Symbol)
            let value = ('getarg args 1)
            sc_keyed_new sym value

run-stage; # 7

# (define-scope-macro name expr ...)
# implies builtin names:
    args : list
    scope : Scope
define-sugar-macro define-sugar-scope-macro
    let name body = (decons args)
    list define name
        list sugar-scope-macro
            cons fn '(args sugar-scope) body

# (define-block-scope-macro name expr ...)
# implies builtin names:
    expr : list
    next-expr : list
    scope : Scope
define-sugar-macro define-sugar-block-scope-macro
    let name body = (decons args)
    list define name
        list sugar-block-scope-macro
            cons fn '(topexpr sugar-scope)
                list let 'expr 'next-expr '= (list decons 'topexpr)
                list let 'expr '= (list (do as) 'expr list)
                body

'set-symbols type
    symbols =
        inline "symbols" (self)
            Generator
                inline () (sc_type_next self unnamed)
                inline (key value) (key != unnamed)
                inline (key value) (_ key value)
                inline (key value) (sc_type_next self key)
    elements =
        inline "elements" (self)
            let count = ('element-count self)
            Generator
                inline () 0
                inline (i) (i < count)
                inline (i) ('element@ self i)
                inline (i) (i + 1)

do
    inline lineage-generator (self)
        Generator
            inline () self
            inline (self) (self != null)
            inline (self) self
            inline (self)
                sc_scope_get_parent self

    inline scope-generator (self)
        Generator
            inline () (sc_scope_next self -1)
            inline (key value index) (index >= 0)
            inline (key value index) (_ key value)
            inline (key value index)
                sc_scope_next self index

    'set-symbols Scope
        lineage = lineage-generator
        deleted =
            inline (self)
                Generator
                    inline () (sc_scope_next_deleted self -1)
                    inline (key index) (index >= 0)
                    inline (key index) key
                    inline (key index)
                        sc_scope_next_deleted self index
        __as =
            spice-cast-macro
                fn "scope-as" (vT T)
                    if (T == Generator)
                        return `scope-generator
                    `()

do
    inline string-generator (self)
        let buf sz = ('buffer self)
        Generator
            inline () 0:usize
            inline (i) (i < sz)
            inline (i) (load (getelementptr buf i))
            inline (i) (i + 1:usize)

    inline string-generator-range (self start end)
        start := start as usize
        let buf sz = ('buffer self)
        let end =
            static-branch (none? end)
                inline () sz
                inline ()
                    end := end as usize
                    ? (sz < end) sz end
        Generator
            inline () start
            inline (i) (i < end)
            inline (i) (load (getelementptr buf i))
            inline (i) (i + 1:usize)

    inline string-collector (maxsize)
        let buf = (alloca-array i8 maxsize)
        Collector
            inline () 0
            inline (n) (n < maxsize)
            inline (n)
                sc_string_new buf (n as usize)
            inline (src n)
                store (src) (getelementptr buf n)
                n + 1

    fn i8->string(c)
        let ptr = (alloca i8)
        store c ptr
        sc_string_new ptr 1

    'set-symbols string
        collector = string-collector
        range = string-generator-range
        __hash =
            inline (self)
                hash.from-bytes ('buffer self)
        __ras =
            spice-cast-macro
                fn "string-as" (vT T)
                    if (vT == i8)
                        return `i8->string
                    `()
        __as =
            spice-cast-macro
                fn "string-as" (vT T)
                    if (T == Generator)
                        return `string-generator
                    `()

do
    inline list-generator (self)
        Generator
            inline () self
            inline (cell) (not (empty? cell))
            inline (cell) (sc_list_at cell)
            inline (cell) (sc_list_next cell)

    inline list-collector (self)
        Collector
            inline () self
            inline (it) true
            inline (it) ('reverse it)
            inline (src it)
                cons (src) it

    'set-symbols list
        cons-sink =
            inline "list-collector" (self)
                Collector
                    inline () self
                    inline (it) true
                    inline (it) it
                    inline (src it)
                        cons (src) it
        __as =
            spice-cast-macro
                fn "list-as" (vT T)
                    if (T == Generator)
                        return `list-generator
                    elseif (T == Collector)
                        return `list-collector
                    `()

'set-symbols Value
    args =
        inline "Value-args" (self)
            let argc = ('argcount self)
            Generator
                inline () 0
                inline (x) (x < argc)
                inline (x) ('getarg self x)
                inline (x) (x + 1)
    reverse-args =
        inline "Value-reverse-args" (self)
            let argc = ('argcount self)
            Generator
                inline () argc
                inline (x) (x > 0)
                inline (x) ('getarg self (x - 1))
                inline (x) (x - 1)
    arglist-sink =
        inline "arglist-sink" (N)
            let values = (alloca-array Value N)
            Collector
                inline () 0
                inline (i) (i < N)
                inline (i)
                    sc_argument_list_new i values
                inline (src i)
                    store (sc_identity (src)) (getelementptr values i)
                    add i 1

inline range (a b c)
    let num-type = (typeof a)
    let step =
        static-branch (none? c)
            inline () (1 as num-type)
            inline () c
    let from =
        static-branch (none? b)
            inline () (0 as num-type)
            inline () a
    let to =
        static-branch (none? b)
            inline () a
            inline () b
    Generator
        inline () (deref from)
        inline (x) (x < to)
        inline (x) x
        inline (x) (x + step)

inline rrange (a b c)
    """"Same as `range`, but iterates range in reverse; arguments are passed
        in the same format, so `rrange` can act as a drop-in replacement for
        `range`.
    let num-type = (typeof a)
    let step =
        static-branch (none? c)
            inline () (1 as num-type)
            inline () c
    let from =
        static-branch (none? b)
            inline () (0 as num-type)
            inline () a
    let to =
        static-branch (none? b)
            inline () a
            inline () b
    let to = (((to - from + (step - 1)) // step) * step + from)
    Generator
        inline () (_ to (to - step))
        inline (x0 x-1) (x0 > from)
        inline (x0 x-1) x-1
        inline (x0 x-1) (_ x-1 (x-1 - step))

let parse-compile-flags =
    spice-macro
        fn (args)
            inline flag-error (flag)
                error
                    .. "illegal flag: " (repr flag)
                        ". try one of"
                        \ " " (repr 'dump-disassembly)
                        \ " " (repr 'dump-module)
                        \ " " (repr 'dump-function)
                        \ " " (repr 'dump-time)
                        \ " " (repr 'no-debug-info)
                        \ " " (repr 'O1)
                        \ " " (repr 'O2)
                        \ " " (repr 'O3)
            let argc = ('argcount args)
            loop (i flags = 0 0:u64)
                if (i == argc)
                    break `flags
                let arg = ('getarg args i)
                let flag = (arg as Symbol)
                let flag =
                    switch flag
                    case 'dump-disassembly compile-flag-dump-disassembly
                    case 'dump-module compile-flag-dump-module
                    case 'dump-function compile-flag-dump-function
                    case 'dump-time compile-flag-dump-time
                    case 'no-debug-info compile-flag-no-debug-info
                    case 'O1 compile-flag-O1
                    case 'O2 compile-flag-O2
                    case 'O3 compile-flag-O3
                    default (flag-error flag)
                _ (i + 1) (flags | flag)

spice-quote
    inline compile (func flags...)
        sc_compile func (parse-compile-flags flags...)

    inline compile-glsl (version target func flags...)
        sc_compile_glsl version target func (parse-compile-flags flags...)

    inline compile-spirv (target func flags...)
        sc_compile_spirv target func (parse-compile-flags flags...)

    inline compile-object (target file-kind path table flags...)
        sc_compile_object target file-kind path table (parse-compile-flags flags...)

inline convert-assert-args (args cond msg)
    if ((countof args) == 2) msg
    else
        if (('typeof cond) == list)
            `[(sc_list_repr (cond as list))]
        else
            `[('__repr cond)]

define-sugar-macro static-assert
    let cond msg body = (decons args 2)
    let anchor = ('anchor cond)
    let msg = (convert-assert-args args cond msg)
    list ('tag `__static-assert anchor) cond msg

define-sugar-macro assert
    let cond msg body = (decons args 2)
    let msg = (convert-assert-args args cond msg)
    list __assert cond msg

define-sugar-macro while
    let cond body = (decons args)
    list loop '()
        list inline 'continue '()
            list repeat
        list if cond
            cons do body
            list repeat
        list 'else
            list break

#-------------------------------------------------------------------------------
# tuples
#-------------------------------------------------------------------------------

inline make-unpack-function (extractf)
    spice-macro
        fn (args)
            let argc = ('argcount args)
            verify-count argc 1 1
            let self = ('getarg args 0)
            let T = ('typeof self)
            let count = ('element-count T)
            sc_argument_list_map_new count
                inline (i)
                    let argT = ('element@ T i)
                    `(extractf self i)

let __unpack-aggregate = (make-unpack-function extractvalue)

let __unpack-keyed-aggregate =
    spice-macro
        fn (args)
            let argc = ('argcount args)
            verify-count argc 1 1
            let self = ('getarg args 0)
            let T = ('typeof self)
            let count = ('element-count T)
            sc_argument_list_map_new count
                inline (i)
                    let argT = ('element@ T i)
                    let key = ('keyof argT)
                    sc_keyed_new key `(extractvalue self i)

'set-symbols tuple
    __unpack = __unpack-keyed-aggregate
    __countof = __countof-aggregate
    __getattr = extractvalue
    __@ = extractvalue

inline gen-tupleof (type-func)
    spice-macro
        fn (args)
            let argc = ('argcount args)
            #verify-count argc 0 -1
            raising Error

            # build tuple type and values
            # also check if all arguments are constant
            # and build a tuple view if one argument is a view
            let values = (alloca-array Value argc)
            let field-types = (alloca-array type argc)
            let const? view? =
                loop (i const? view? = 0 true false)
                    if (i == argc)
                        break const? view?
                    let k arg = ('dekey ('getarg args i))
                    store arg (getelementptr values i)
                    let view? = (view? | ('view? ('qualifiersof arg)))
                    let T = ('key-type ('typeof arg) k)
                    store T (getelementptr field-types i)
                    _ (i + 1) (const? & ('constant? arg)) view?

            let TT = (type-func argc field-types)
            if const?
                sc_const_aggregate_new TT argc values
            else
                # generate insert instructions
                loop (i result = 0 `(nullof TT))
                    if (i == argc)
                        break result
                    let arg = (load (getelementptr values i))
                    let arg =
                        if view?
                            `(view arg)
                        else arg
                    _ (i + 1)
                        `(insertvalue result arg i)

let tupleof = (gen-tupleof sc_tuple_type)
let packedtupleof = (gen-tupleof sc_packed_tuple_type)

#-------------------------------------------------------------------------------
# arrays
#-------------------------------------------------------------------------------

'set-symbols array
    __== =
        simple-binary-op
            spice-macro
                fn (args)
                    let self = ('getarg args 0)
                    let other = ('getarg args 1)
                    loop (i result = ('element-count ('typeof self)) `true)
                        if (i == 0)
                            break result
                        let i = (i - 1)
                        _   i
                            sc_cond_new `((self @ i) != (other @ i))
                                `false
                                result
    __unpack = __unpack-aggregate
    __countof = __countof-aggregate
    __@ =
        inline (self index)
            extractvalue self index
    # dynamic array constructor
    type =
        inline "array.type" (element-type size)
            sc_array_type element-type (size as usize)
    # static array constructor
    __typecall =
        spice-macro
            fn "array.__typecall" (args)
                let argc = ('argcount args)
                verify-count argc 1 -1
                raising Error