Profiling results ----------------- Total cpu time observed: 36734ms (out of 37204ms) Number of samples taken: 159 (once every 231ms) (Hiding functions with self<1.0% and local<2.0%: 4 of 106 hidden) ======================================================================= Caller Idx Total Self Name+src Local% ms(pct) ms(pct) Callee ======================================================================= ??? [24] 100.0% [1] 35562(96.8%) 0(0.0%) profile-thunk14 ...t/pkgs/profile-lib/main.rkt:9:0 run [5] 100.0% ----------------------------------------------------------------------- ??? [24] 100.0% [2] 22314(60.7%) 0(0.0%) run-improve58 ...ock/herbie/src/mainloop.rkt:242:0 for-loop [6] 94.2% get-final-combination [7] 2.9% setup-prog [8] 2.0% loop [30] 1.0% ----------------------------------------------------------------------- hash-ref! [53] 100.0% [3] 202(0.5%) 0(0.0%) ??? .../ztatlock/herbie/src/core/taylor.rkt:295:23 for-loop [9] 100.0% ----------------------------------------------------------------------- hash-ref! [53] 100.0% [4] 202(0.5%) 0(0.0%) ??? .../ztatlock/herbie/src/core/taylor.rkt:285:26 for-loop [10] 100.0% ----------------------------------------------------------------------- profile-thunk14 [1] 100.0% [5] 35562(96.8%) 0(0.0%) run ...share/racket/pkgs/profile-lib/main.rkt:31:2 ??? [24] 100.0% ----------------------------------------------------------------------- run-improve58 [2] 100.0% [6] 21014(57.2%) 0(0.0%) for-loop ...ztatlock/herbie/src/mainloop.rkt:253:8 run-iter! [11] 100.0% ----------------------------------------------------------------------- run-improve58 [2] 100.0% [7] 646(1.8%) 0(0.0%) get-final-combination ...ie/src/mainloop.rkt:269:0 extract-alt [12] 100.0% ----------------------------------------------------------------------- run-improve58 [2] 100.0% [8] 442(1.2%) 0(0.0%) setup-prog /home/ztatlock/herbie/src/glue.rkt:46:0 simplify-alt [13] 100.0% ----------------------------------------------------------------------- ??? [3] 100.0% [9] 202(0.5%) 0(0.0%) for-loop ...lock/herbie/src/core/taylor.rkt:298:27 hash-ref! [53] 100.0% ----------------------------------------------------------------------- ??? [4] 100.0% [10] 202(0.5%) 0(0.0%) for-loop ...lock/herbie/src/core/taylor.rkt:285:52 ??? [14] 100.0% ----------------------------------------------------------------------- for-loop [6] 100.0% [11] 21014(57.2%) 0(0.0%) run-iter! ...tatlock/herbie/src/mainloop.rkt:223:0 simplify! [16] 93.3% finalize-iter! [17] 4.8% gen-series! [18] 1.9% ----------------------------------------------------------------------- get-final-combination [7] 100.0% [12] 646(1.8%) 0(0.0%) extract-alt ...e/ztatlock/herbie/src/glue.rkt:57:0 loop [69] 100.0% ----------------------------------------------------------------------- setup-prog [8] 100.0% [13] 442(1.2%) 0(0.0%) simplify-alt .../ztatlock/herbie/src/glue.rkt:84:0 simplify [15] 100.0% ----------------------------------------------------------------------- for-loop [10] 100.0% [14] 202(0.5%) 0(0.0%) ??? .../ztatlock/herbie/src/core/taylor.rkt:288:19 hash-ref! [53] 100.0% ----------------------------------------------------------------------- simplify-alt [13] 2.1% loop [69] 3.1% ??? [24] 94.7% [15] 20696(56.3%) 0(0.0%) simplify ...lock/herbie/src/core/simplify.rkt:39:0 simplify-expr [20] 70.1% iterate-egraph!5 [25] 24.1% for-loop [21] 5.7% ----------------------------------------------------------------------- run-iter! [11] 100.0% [16] 19608(53.4%) 0(0.0%) simplify! ...tatlock/herbie/src/mainloop.rkt:162:0 for-loop [19] 100.0% ----------------------------------------------------------------------- run-iter! [11] 100.0% [17] 1004(2.7%) 0(0.0%) finalize-iter! ...ck/herbie/src/mainloop.rkt:177:0 ??? [22] 100.0% ----------------------------------------------------------------------- run-iter! [11] 100.0% [18] 402(1.1%) 0(0.0%) gen-series! ...tlock/herbie/src/mainloop.rkt:134:0 for-loop [23] 100.0% ----------------------------------------------------------------------- simplify! [16] 100.0% [19] 19608(53.4%) 0(0.0%) for-loop ...ztatlock/herbie/src/mainloop.rkt:166:6 ??? [24] 100.0% ----------------------------------------------------------------------- simplify [15] 100.0% [20] 14510(39.5%) 0(0.0%) simplify-expr ...herbie/src/core/simplify.rkt:68:0 iterate-egraph!5 [25] 100.0% ----------------------------------------------------------------------- simplify [15] 100.0% [21] 1190(3.2%) 0(0.0%) for-loop ...ock/herbie/src/core/simplify.rkt:61:12 iterate-egraph!5 [25] 100.0% ----------------------------------------------------------------------- finalize-iter! [17] 100.0% [22] 1004(2.7%) 0(0.0%) ??? ...contract/private/arrow-val-first.rkt:357:18 for-loop [26] 80.1% atab-add-altns [28] 19.9% ----------------------------------------------------------------------- gen-series! [18] 100.0% [23] 402(1.1%) 0(0.0%) for-loop ...ztatlock/herbie/src/mainloop.rkt:140:7 taylor-alt [27] 100.0% ----------------------------------------------------------------------- for-loop [19] 18.3% run [5] 40.0% [24] 36734(100.0%) 0(0.0%) ??? ...lects/racket/private/more-scheme.rkt:261:28 profile-thunk14 [1] 40.0% run-improve58 [2] 22.0% loop [30] 19.6% simplify [15] 18.3% ----------------------------------------------------------------------- for-loop [21] 5.7% simplify [15] 24.1% simplify-expr [20] 70.1% [25] 20696(56.3%) 0(0.0%) iterate-egraph!5 ...bie/src/core/simplify.rkt:95:0 one-iter [29] 97.9% map-enodes [32] 2.1% ----------------------------------------------------------------------- ??? [22] 100.0% [26] 804(2.2%) 0(0.0%) for-loop ...ock/herbie/src/core/alt-table.rkt:51:2 atab-add-altn [31] 100.0% ----------------------------------------------------------------------- for-loop [23] 100.0% [27] 402(1.1%) 0(0.0%) taylor-alt ...e/ztatlock/herbie/src/glue.rkt:142:0 for-loop [33] 100.0% ----------------------------------------------------------------------- ??? [22] 100.0% [28] 200(0.5%) 0(0.0%) atab-add-altns ...rbie/src/core/alt-table.rkt:50:0 atab-add-altn [31] 100.0% ----------------------------------------------------------------------- iterate-egraph!5 [25] 100.0% [29] 20254(55.1%) 220(0.6%) one-iter ...ock/herbie/src/core/simplify.rkt:106:0 loop [34] 50.5% for-loop [35] 43.1% apply-match [39] 5.4% ----------------------------------------------------------------------- run-improve58 [2] 1.4% ??? [24] 98.6% [30] 14632(39.8%) 222(0.6%) loop /home/ztatlock/herbie/src/points.rkt:122:2 make-exacts* [40] 39.1% loop [36] 38.3% loop [41] 21.1% ----------------------------------------------------------------------- atab-add-altns [28] 19.9% for-loop [26] 80.1% [31] 1004(2.7%) 0(0.0%) atab-add-altn ...rbie/src/core/alt-table.rkt:208:0 best-and-tied-at-points [37] 100.0% ----------------------------------------------------------------------- iterate-egraph!5 [25] 100.0% [32] 442(1.2%) 0(0.0%) map-enodes ...ock/herbie/src/core/egraph.rkt:139:0 loop [69] 100.0% ----------------------------------------------------------------------- taylor-alt [27] 100.0% [33] 402(1.1%) 0(0.0%) for-loop /home/ztatlock/herbie/src/glue.rkt:144:2 location-do [38] 100.0% ----------------------------------------------------------------------- one-iter [29] 100.0% [34] 10226(27.8%) 0(0.0%) loop ...cket/collects/racket/private/map.rkt:53:19 apply-match [39] 100.0% ----------------------------------------------------------------------- for-loop [35] 47.9% one-iter [29] 52.1% [35] 8724(23.7%) 1650(4.5%) for-loop ...ck/herbie/src/core/simplify.rkt:116:12 for-loop [35] 47.9% match-e [45] 40.5% ----------------------------------------------------------------------- loop [30] 100.0% [36] 5600(15.2%) 0(0.0%) loop /home/ztatlock/herbie/src/points.rkt:93:2 make-exacts* [40] 53.6% loop [41] 46.4% ----------------------------------------------------------------------- atab-add-altn [31] 100.0% [37] 1004(2.7%) 200(0.5%) best-and-tied-at-points ...ore/alt-table.rkt:122:0 errors [42] 80.1% ----------------------------------------------------------------------- location-do [38] 33.5% for-loop [33] 66.5% [38] 402(1.1%) 0(0.0%) location-do ...tlock/herbie/src/programs.rkt:129:0 approximate9 [43] 66.5% location-do [38] 33.5% ----------------------------------------------------------------------- one-iter [29] 9.6% loop [34] 90.4% [39] 11310(30.8%) 0(0.0%) apply-match .../herbie/src/core/simplify.rkt:122:2 merge-egraph-nodes! [51] 48.1% match-e [45] 15.8% for-loop [46] 12.9% loop! [65] 11.6% update-leader! [55] 7.8% substitute-e [48] 2.0% ----------------------------------------------------------------------- loop [36] 34.4% loop [30] 65.6% [40] 8732(23.8%) 254(0.7%) make-exacts* ...tatlock/herbie/src/points.rkt:80:0 loop [69] 53.2% map [44] 43.9% ----------------------------------------------------------------------- loop [36] 45.7% loop [30] 54.3% [41] 5678(15.5%) 0(0.0%) loop /home/ztatlock/herbie/src/points.rkt:83:4 map [44] 100.0% ----------------------------------------------------------------------- best-and-tied-at-points [37] 100.0% [42] 804(2.2%) 0(0.0%) errors /home/ztatlock/herbie/src/points.rkt:144:0 for-loop [47] 100.0% ----------------------------------------------------------------------- location-do [38] 100.0% [43] 402(1.1%) 0(0.0%) approximate9 ...ck/herbie/src/core/taylor.rkt:11:0 loop [49] 50.2% taylor [50] 49.8% ----------------------------------------------------------------------- make-exacts* [40] 40.3% loop [41] 59.7% [44] 9510(25.9%) 0(0.0%) map ...acket/collects/racket/private/map.rkt:21:13 loop [69] 100.0% ----------------------------------------------------------------------- for-loop [56] 8.1% apply-match [39] 13.8% for-loop [35] 78.1% [45] 8858(24.1%) 4502(12.3%) match-e ...tatlock/herbie/src/core/ematch.rkt:46:0 for-loop [52] 37.6% for-loop [56] 8.8% custom-in-set [73] 2.7% constant? [80] 2.5% list-cartesian-product [57] 1.2% ----------------------------------------------------------------------- apply-match [39] 100.0% [46] 1454(4.0%) 0(0.0%) for-loop ...ck/herbie/src/core/simplify.rkt:136:10 loop! [65] 70.8% merge-egraph-nodes! [51] 29.2% ----------------------------------------------------------------------- errors [42] 100.0% [47] 804(2.2%) 0(0.0%) for-loop ...e/ztatlock/herbie/src/points.rkt:147:4 ??? [75] 75.1% ulp-difference [54] 24.9% ----------------------------------------------------------------------- substitute-e [48] 50.0% apply-match [39] 50.0% [48] 222(0.6%) 222(0.6%) substitute-e ...ck/herbie/src/core/ematch.rkt:71:0 substitute-e [48] 50.0% ----------------------------------------------------------------------- approximate9 [43] 100.0% [49] 202(0.5%) 0(0.0%) loop ...e/ztatlock/herbie/src/core/taylor.rkt:82:4 hash-ref! [53] 100.0% ----------------------------------------------------------------------- approximate9 [43] 100.0% [50] 200(0.5%) 200(0.5%) taylor ...tatlock/herbie/src/core/taylor.rkt:157:0 ----------------------------------------------------------------------- for-loop [58] 1.2% merge-egraph-nodes! [51] 5.3% for-loop [46] 7.2% apply-match [39] 86.2% [51] 5866(16.0%) 0(0.0%) merge-egraph-nodes! ...e/src/core/egraph.rkt:152:0 update-leader! [55] 62.5% loop! [65] 13.1% for-loop [58] 11.9% merge-egraph-nodes! [51] 5.3% make-sequence [59] 3.8% for-loop [63] 3.4% ----------------------------------------------------------------------- match-e [45] 100.0% [52] 3564(9.7%) 1502(4.1%) for-loop ...tlock/herbie/src/core/ematch.rkt:59:11 for-loop [56] 26.8% loop [69] 17.7% list-cartesian-product [57] 15.0% ----------------------------------------------------------------------- ??? [14] 16.7% ??? [61] 16.7% loop [49] 16.7% for-loop [9] 50.0% [53] 202(0.5%) 0(0.0%) hash-ref! ...racket/private/more-scheme.rkt:373:13 ??? [3] 50.0% ??? [61] 16.7% ??? [4] 16.7% simplify [60] 16.7% ----------------------------------------------------------------------- for-loop [47] 100.0% [54] 200(0.5%) 0(0.0%) ulp-difference ...atlock/herbie/src/float.rkt:19:0 ??? [62] 100.0% ----------------------------------------------------------------------- apply-match [39] 18.1% merge-egraph-nodes! [51] 81.9% [55] 4858(13.2%) 222(0.6%) update-leader! ...herbie/src/core/egraph.rkt:217:0 for-loop [64] 95.4% ----------------------------------------------------------------------- match-e [45] 44.6% for-loop [52] 55.4% [56] 2218(6.0%) 242(0.7%) for-loop ...tlock/herbie/src/core/ematch.rkt:65:37 match-e [45] 64.4% ??? [66] 24.7% ----------------------------------------------------------------------- match-e [45] 25.5% for-loop [52] 74.5% [57] 864(2.4%) 864(2.4%) list-cartesian-product ...src/core/ematch.rkt:20:0 ----------------------------------------------------------------------- merge-egraph-nodes! [51] 100.0% [58] 770(2.1%) 0(0.0%) for-loop ...lock/herbie/src/core/egraph.rkt:200:10 loop! [65] 81.3% merge-egraph-nodes! [51] 18.7% ----------------------------------------------------------------------- merge-egraph-nodes! [51] 100.0% [59] 222(0.6%) 0(0.0%) make-sequence ...ects/racket/private/for.rkt:508:2 ??? [67] 100.0% ----------------------------------------------------------------------- hash-ref! [53] 100.0% [60] 202(0.5%) 0(0.0%) simplify ...atlock/herbie/src/core/reduce.rkt:18:0 parse-loop50 [68] 100.0% ----------------------------------------------------------------------- hash-ref! [53] 100.0% [61] 202(0.5%) 0(0.0%) ??? ...e/ztatlock/herbie/src/core/taylor.rkt:42:15 hash-ref! [53] 100.0% ----------------------------------------------------------------------- ulp-difference [54] 100.0% [62] 200(0.5%) 200(0.5%) ??? /home/ztatlock/herbie/src/config.rkt:29:0 ----------------------------------------------------------------------- merge-egraph-nodes! [51] 100.0% [63] 200(0.5%) 0(0.0%) for-loop ...tlock/herbie/src/core/egraph.rkt:232:6 update-en-expr [93] 100.0% ----------------------------------------------------------------------- update-leader! [55] 100.0% [64] 4636(12.6%) 0(0.0%) for-loop ...tlock/herbie/src/core/egraph.rkt:222:6 for-loop [70] 100.0% ----------------------------------------------------------------------- for-loop [58] 13.5% for-loop [46] 16.3% merge-egraph-nodes! [51] 17.1% loop [69] 24.3% apply-match [39] 28.9% [65] 3804(10.4%) 1482(4.0%) loop! .../ztatlock/herbie/src/core/enode.rkt:163:2 custom-set-union [71] 34.4% loop [69] 29.7% set [72] 7.7% update-en-expr [93] 2.9% ----------------------------------------------------------------------- for-loop [56] 100.0% [66] 548(1.5%) 346(0.9%) ??? /home/ztatlock/herbie/src/core/ematch.rkt:50:5 for-loop [74] 36.9% ----------------------------------------------------------------------- make-sequence [59] 100.0% [67] 222(0.6%) 0(0.0%) ??? ...acket/collects/racket/private/for.rkt:428:7 custom-in-set [73] 100.0% ----------------------------------------------------------------------- simplify [60] 25.0% parse-loop50 [68] 75.0% [68] 202(0.5%) 202(0.5%) parse-loop50 ...s/racket/match/compiler.rkt:410:15 parse-loop50 [68] 75.0% ----------------------------------------------------------------------- make-exacts* [40] 0.1% for-loop [52] 0.5% map-enodes [32] 0.6% map [44] 0.7% loop! [65] 0.8% extract-alt [12] 3.0% loop [69] 94.2% [69] 17928(48.8%) 418(1.1%) loop ...cket/collects/racket/private/map.rkt:26:19 loop [69] 94.2% simplify [15] 3.0% ??? [75] 0.9% loop! [65] 0.7% for-loop [79] 0.6% foldl [81] 0.2% ->flonum [78] 0.0% ----------------------------------------------------------------------- for-loop [64] 100.0% [70] 4636(12.6%) 0(0.0%) for-loop ...tlock/herbie/src/core/egraph.rkt:223:8 hash-update! [76] 100.0% ----------------------------------------------------------------------- loop! [65] 100.0% [71] 1308(3.6%) 202(0.5%) custom-set-union ...et/private/set-types.rkt:168:0 for-loop [77] 84.6% ----------------------------------------------------------------------- loop! [65] 100.0% [72] 588(1.6%) 588(1.6%) set ...collects/racket/private/set-types.rkt:982:0 ----------------------------------------------------------------------- ??? [67] 47.8% match-e [45] 52.2% [73] 464(1.3%) 464(1.3%) custom-in-set ...acket/private/set-types.rkt:578:0 ----------------------------------------------------------------------- ??? [66] 100.0% [74] 202(0.5%) 0(0.0%) for-loop ...atlock/herbie/src/core/ematch.rkt:51:7 constant? [80] 100.0% ----------------------------------------------------------------------- for-loop [47] 4.3% loop [69] 95.7% [75] 14010(38.1%) 1456(4.0%) ??? /home/ztatlock/herbie/src/programs.rkt:168:4 ??? [82] 61.2% real->bigfloat [96] 20.2% ??? [99] 6.4% ----------------------------------------------------------------------- for-loop [70] 100.0% [76] 4636(12.6%) 240(0.7%) hash-update! ...ket/private/more-scheme.rkt:362:13 ??? [83] 94.8% ----------------------------------------------------------------------- custom-set-union [71] 100.0% [77] 1106(3.0%) 200(0.5%) for-loop ...cts/racket/private/set-types.rkt:174:3 for-loop [84] 81.9% ----------------------------------------------------------------------- loop [69] 100.0% [78] 750(2.0%) 298(0.8%) ->flonum ...ock/herbie/src/syntax/syntax.rkt:224:0 ??? [86] 31.2% ??? [100] 29.1% ----------------------------------------------------------------------- loop [69] 100.0% [79] 442(1.2%) 0(0.0%) for-loop ...ock/herbie/src/core/simplify.rkt:161:2 eval-const-expr [85] 100.0% ----------------------------------------------------------------------- for-loop [74] 47.4% match-e [45] 52.6% [80] 426(1.2%) 426(1.2%) constant? ...ck/herbie/src/syntax/syntax.rkt:221:0 ----------------------------------------------------------------------- loop [69] 100.0% [81] 200(0.5%) 0(0.0%) foldl ...et/collects/racket/private/list.rkt:229:4 merge2 [87] 100.0% ----------------------------------------------------------------------- ??? [75] 100.0% [82] 8580(23.4%) 604(1.6%) ??? ...acket/collects/racket/private/kw.rkt:400:14 ??? [92] 62.8% bf* [89] 19.3% ...higher-order.rkt:373:33 [90] 10.8% ----------------------------------------------------------------------- hash-update! [76] 100.0% [83] 4396(12.0%) 0(0.0%) ??? .../ztatlock/herbie/src/core/egraph.rkt:225:24 for-loop [88] 100.0% ----------------------------------------------------------------------- for-loop [77] 100.0% [84] 906(2.5%) 906(2.5%) for-loop ...cts/racket/private/set-types.rkt:178:5 ----------------------------------------------------------------------- for-loop [79] 100.0% [85] 442(1.2%) 0(0.0%) eval-const-expr ...k/herbie/src/programs.rkt:180:0 expression-induct31 [91] 100.0% ----------------------------------------------------------------------- ->flonum [78] 100.0% [86] 234(0.6%) 0(0.0%) ??? ...-racket/utils/simple-result-arrow.rkt:47:15 ??? [101] 100.0% ----------------------------------------------------------------------- foldl [81] 100.0% [87] 200(0.5%) 200(0.5%) merge2 ...ztatlock/herbie/src/core/ematch.rkt:31:0 ----------------------------------------------------------------------- ??? [83] 100.0% [88] 4396(12.0%) 3976(10.8%) for-loop ...lock/herbie/src/core/egraph.rkt:226:26 update-en-expr [93] 9.6% ----------------------------------------------------------------------- ??? [82] 100.0% [89] 1658(4.5%) 0(0.0%) bf* ...ath/private/bigfloat/bigfloat-mpfr.rkt:95:0 ??? [92] 100.0% ----------------------------------------------------------------------- ??? [82] 100.0% [90] 930(2.5%) 0(0.0%) ...higher-order.rkt:373:33 (unknown source) ??? [94] 74.0% ??? [99] 26.0% ----------------------------------------------------------------------- eval-const-expr [85] 100.0% [91] 442(1.2%) 0(0.0%) expression-induct31 ...erbie/src/programs.rkt:55:0 inductor [95] 100.0% ----------------------------------------------------------------------- bf* [89] 23.5% ??? [82] 76.5% [92] 7046(19.2%) 1972(5.4%) ??? ...-racket/utils/simple-result-arrow.rkt:26:12 bfcos [97] 35.5% bfadd [98] 30.0% ??? [100] 6.4% ----------------------------------------------------------------------- for-loop [63] 23.9% loop! [65] 26.0% for-loop [88] 50.1% [93] 838(2.3%) 838(2.3%) update-en-expr ...herbie/src/core/egraph.rkt:211:0 ----------------------------------------------------------------------- ...higher-order.rkt:373:33 [90]100.0% [94] 688(1.9%) 0(0.0%) ??? ...cts/racket/contract/private/list.rkt:187:10 ??? [99] 100.0% ----------------------------------------------------------------------- inductor [95] 50.0% expression-induct31 [91] 50.0% [95] 442(1.2%) 222(0.6%) inductor .../ztatlock/herbie/src/programs.rkt:73:2 inductor [95] 50.0% real->bigfloat [96] 24.9% ----------------------------------------------------------------------- inductor [95] 7.2% ??? [75] 92.8% [96] 3050(8.3%) 2284(6.2%) real->bigfloat .../private/bigfloat/mpfr.rkt:451:0 ??? [101] 25.1% ----------------------------------------------------------------------- ??? [92] 100.0% [97] 2504(6.8%) 2074(5.6%) bfcos ...-lib/math/private/bigfloat/mpfr.rkt:616:4 ??? [101] 17.2% ----------------------------------------------------------------------- ??? [92] 100.0% [98] 2116(5.8%) 2116(5.8%) bfadd ...-lib/math/private/bigfloat/mpfr.rkt:819:4 ----------------------------------------------------------------------- ...higher-order.rkt:373:33 [90] 13.2% ??? [94] 37.6% ??? [75] 49.2% [99] 1830(5.0%) 0(0.0%) ??? ...ects/racket/contract/private/guts.rkt:638:8 ??? [100] 100.0% ----------------------------------------------------------------------- ->flonum [78] 8.7% ??? [92] 18.1% ??? [99] 73.1% [100] 2502(6.8%) 2072(5.6%) ??? ...tract/private/arrow-higher-order.rkt:373:33 ??? [102] 17.2% ----------------------------------------------------------------------- ??? [86] 16.4% bfcos [97] 30.1% real->bigfloat [96] 53.6% [101] 1430(3.9%) 1430(3.9%) ??? .../share/racket/collects/ffi/unsafe.rkt:861:4 ----------------------------------------------------------------------- ??? [100] 100.0% [102] 430(1.2%) 430(1.2%) ??? ...llects/racket/contract/combinator.rkt:178:4 -----------------------------------------------------------------------