Profiling results ----------------- Total cpu time observed: 146708ms (out of 149148ms) Number of samples taken: 380 (once every 386ms) (Hiding functions with self<1.0% and local<2.0%: 1 of 105 hidden) =========================================================================== Caller Idx Total Self Name+src Local% ms(pct) ms(pct) Callee =========================================================================== ??? [38] 100.0% [1] 146708(100.0%) 0(0.0%) profile-thunk16 ...e/pkgs/profile-lib/main.rkt:9:0 run [5] 100.0% --------------------------------------------------------------------------- loop [18] 0.6% loop [48] 99.4% [2] 123404(84.1%) 0(0.0%) composed ...ollects/racket/private/list.rkt:321:16 ??? [6] 100.0% --------------------------------------------------------------------------- ??? [38] 100.0% [3] 6746(4.6%) 0(0.0%) run-improve43 ...nal-posits/src/mainloop.rkt:340:0 setup-prog!34 [7] 75.5% for-loop [8] 24.5% --------------------------------------------------------------------------- hash-ref! [54] 100.0% [4] 1060(0.7%) 0(0.0%) ??? ...rbie/optional-posits/src/programs.rkt:142:5 loop [48] 100.0% --------------------------------------------------------------------------- profile-thunk16 [1] 100.0% [5] 146708(100.0%) 0(0.0%) run ...et-7.0/share/pkgs/profile-lib/main.rkt:39:2 ??? [38] 100.0% --------------------------------------------------------------------------- for-loop [60] 0.2% ??? [38] 0.3% loop [48] 6.2% composed [2] 93.3% [6] 132302(90.2%) 1330(0.9%) ??? ...erbie/optional-posits/src/programs.rkt:99:2 ??? [10] 85.0% ??? [65] 14.0% --------------------------------------------------------------------------- run-improve43 [3] 100.0% [7] 5096(3.5%) 0(0.0%) setup-prog!34 ...onal-posits/src/mainloop.rkt:67:0 loop [9] 93.4% ??? [23] 6.6% --------------------------------------------------------------------------- run-improve43 [3] 100.0% [8] 1650(1.1%) 0(0.0%) for-loop ...optional-posits/src/mainloop.rkt:355:4 run-iter! [11] 100.0% --------------------------------------------------------------------------- setup-prog!34 [7] 3.4% ??? [38] 96.6% [9] 138856(94.6%) 0(0.0%) loop ...erbie/optional-posits/src/points.rkt:300:2 loop [18] 33.2% loop [12] 32.6% make-exacts-walkup [19] 31.7% for-loop [13] 1.5% filter-p&e [14] 1.1% --------------------------------------------------------------------------- ??? [6] 100.0% [10] 112462(76.7%) 662(0.5%) ??? ...t-7.0/collects/racket/private/kw.rkt:592:14 ??? [52] 99.4% --------------------------------------------------------------------------- for-loop [8] 100.0% [11] 1650(1.1%) 0(0.0%) run-iter! ...ptional-posits/src/mainloop.rkt:321:0 localize! [15] 61.1% finalize-iter! [16] 20.8% choose-best-alt! [17] 18.1% --------------------------------------------------------------------------- loop [9] 100.0% [12] 45202(30.8%) 0(0.0%) loop ...erbie/optional-posits/src/points.rkt:261:2 loop [18] 56.9% make-exacts-walkup [19] 43.1% --------------------------------------------------------------------------- loop [9] 100.0% [13] 2112(1.4%) 0(0.0%) for-loop .../optional-posits/src/points.rkt:320:19 ??? [20] 100.0% --------------------------------------------------------------------------- loop [9] 100.0% [14] 1534(1.0%) 0(0.0%) filter-p&e ...optional-posits/src/points.rkt:274:0 for-loop [21] 100.0% --------------------------------------------------------------------------- run-iter! [11] 100.0% [15] 1008(0.7%) 0(0.0%) localize! ...ptional-posits/src/mainloop.rkt:120:0 localize-error [22] 100.0% --------------------------------------------------------------------------- run-iter! [11] 100.0% [16] 344(0.2%) 0(0.0%) finalize-iter! ...al-posits/src/mainloop.rkt:272:0 ??? [23] 100.0% --------------------------------------------------------------------------- run-iter! [11] 100.0% [17] 298(0.2%) 0(0.0%) choose-best-alt! ...-posits/src/mainloop.rkt:111:0 ??? [23] 100.0% --------------------------------------------------------------------------- loop [12] 35.8% loop [9] 64.2% [18] 71746(48.9%) 0(0.0%) loop ...erbie/optional-posits/src/points.rkt:244:4 loop [48] 99.0% composed [2] 1.0% --------------------------------------------------------------------------- loop [12] 30.7% loop [9] 69.3% [19] 63464(43.3%) 326(0.2%) make-exacts-walkup ...-posits/src/points.rkt:240:0 loop [48] 94.5% eval-prog [24] 5.0% --------------------------------------------------------------------------- for-loop [13] 100.0% [20] 2112(1.4%) 598(0.4%) ??? ...herbie/optional-posits/src/points.rkt:127:2 ??? [65] 71.7% --------------------------------------------------------------------------- filter-p&e [14] 100.0% [21] 1534(1.0%) 0(0.0%) for-loop ...e/optional-posits/src/points.rkt:276:2 ordinary-value? [67] 100.0% --------------------------------------------------------------------------- localize! [15] 100.0% [22] 1008(0.7%) 0(0.0%) localize-error ...osits/src/core/localize.rkt:57:0 hash-ref! [54] 63.1% ??? [25] 36.9% --------------------------------------------------------------------------- choose-best-alt! [17] 30.5% setup-prog!34 [7] 34.2% finalize-iter! [16] 35.2% [23] 976(0.7%) 0(0.0%) ??? ...contract/private/arrow-val-first.rkt:388:18 for-loop [26] 35.2% make-alt-table [27] 34.2% ??? [28] 30.5% --------------------------------------------------------------------------- make-exacts-walkup [19] 100.0% [24] 3192(2.2%) 0(0.0%) eval-prog ...optional-posits/src/programs.rkt:83:0 hash-ref! [54] 46.2% temp68_2 [30] 19.8% inductor [31] 12.0% eval-one-top12 [33] 11.2% loop [99] 10.9% --------------------------------------------------------------------------- localize-error [22] 100.0% [25] 372(0.3%) 0(0.0%) ??? ...-7.0/collects/racket/private/sort.rkt:369:3 generic-sort/key [32] 100.0% --------------------------------------------------------------------------- ??? [23] 100.0% [26] 344(0.2%) 0(0.0%) for-loop ...nal-posits/src/core/alt-table.rkt:56:2 atab-add-altn [34] 100.0% --------------------------------------------------------------------------- ??? [23] 100.0% [27] 334(0.2%) 0(0.0%) make-alt-table ...sits/src/core/alt-table.rkt:33:0 errors [29] 100.0% --------------------------------------------------------------------------- ??? [23] 100.0% [28] 298(0.2%) 0(0.0%) ??? ...optional-posits/src/core/alt-table.rkt:59:0 ??? [65] 100.0% --------------------------------------------------------------------------- ??? [97] 13.4% make-alt-table [27] 15.0% ??? [38] 71.6% [29] 2226(1.5%) 0(0.0%) errors ...bie/optional-posits/src/points.rkt:223:0 for-loop [35] 100.0% --------------------------------------------------------------------------- eval-prog [24] 100.0% [30] 632(0.4%) 0(0.0%) temp68_2 (unknown source) compile16 [36] 100.0% --------------------------------------------------------------------------- eval-prog [24] 33.3% inductor [31] 66.7% [31] 382(0.3%) 0(0.0%) inductor .../optional-posits/src/programs.rkt:88:4 inductor [31] 66.7% ??? [65] 33.3% --------------------------------------------------------------------------- ??? [25] 100.0% [32] 372(0.3%) 0(0.0%) generic-sort/key .../racket/private/sort.rkt:156:2 errors-score [41] 100.0% --------------------------------------------------------------------------- eval-prog [24] 100.0% [33] 356(0.2%) 0(0.0%) eval-one-top12 (unknown source) for-loop [62] 100.0% --------------------------------------------------------------------------- for-loop [26] 100.0% [34] 344(0.2%) 0(0.0%) atab-add-altn ...sits/src/core/alt-table.rkt:202:0 override-at-pnts [37] 100.0% --------------------------------------------------------------------------- errors [29] 100.0% [35] 2226(1.5%) 0(0.0%) for-loop ...e/optional-posits/src/points.rkt:225:2 ??? [38] 100.0% --------------------------------------------------------------------------- temp68_2 [30] 100.0% [36] 632(0.4%) 0(0.0%) compile16 (unknown source) temp74_0 [39] 100.0% --------------------------------------------------------------------------- atab-add-altn [34] 100.0% [37] 344(0.2%) 344(0.2%) override-at-pnts ...s/src/core/alt-table.rkt:138:0 --------------------------------------------------------------------------- for-loop [35] 0.5% run [5] 49.7% [38] 146708(100.0%) 0(0.0%) ??? ...lects/racket/private/more-scheme.rkt:261:28 profile-thunk16 [1] 49.7% loop [9] 45.7% run-improve43 [3] 2.2% oracle-error [40] 0.6% eval-errors [53] 0.6% errors [29] 0.4% ordinary-value? [67] 0.2% ulp-difference [86] 0.1% baseline-error [43] 0.1% errors-score [41] 0.1% ??? [6] 0.1% ??? [87] 0.1% --------------------------------------------------------------------------- compile16 [36] 100.0% [39] 632(0.4%) 0(0.0%) temp74_0 (unknown source) expand-single [42] 100.0% --------------------------------------------------------------------------- ??? [38] 100.0% [40] 1870(1.3%) 0(0.0%) oracle-error ...tional-posits/src/points.rkt:207:0 for-loop [44] 100.0% --------------------------------------------------------------------------- ??? [38] 44.0% generic-sort/key [32] 56.0% [41] 664(0.5%) 0(0.0%) errors-score ...tional-posits/src/points.rkt:215:0 loop [46] 100.0% --------------------------------------------------------------------------- temp74_0 [39] 100.0% [42] 632(0.4%) 0(0.0%) expand-single (unknown source) expand-capturing-lifts [45] 100.0% --------------------------------------------------------------------------- ??? [38] 100.0% [43] 300(0.2%) 0(0.0%) baseline-error ...onal-posits/src/points.rkt:211:0 argmin [47] 100.0% --------------------------------------------------------------------------- oracle-error [40] 100.0% [44] 1870(1.3%) 0(0.0%) for-loop ...e/optional-posits/src/points.rkt:208:2 loop [48] 84.0% map [69] 16.0% --------------------------------------------------------------------------- loop [99] 35.5% expand-single [42] 64.5% [45] 980(0.7%) 348(0.2%) expand-capturing-lifts (unknown source) dispatch-transformer41 [49] 34.1% lambda-clause-expander [51] 30.4% --------------------------------------------------------------------------- errors-score [41] 100.0% [46] 664(0.5%) 0(0.0%) loop .../racket-7.0/collects/racket/list.rkt:559:2 ordinary-value? [67] 100.0% --------------------------------------------------------------------------- baseline-error [43] 100.0% [47] 300(0.2%) 0(0.0%) argmin ...acket-7.0/collects/racket/list.rkt:765:0 ??? [50] 100.0% --------------------------------------------------------------------------- map [69] 0.0% ??? [4] 0.8% make-exacts-walkup [19] 0.8% for-loop [44] 1.2% loop [18] 1.6% loop [48] 95.6% [48] 134230(91.5%) 330(0.2%) loop ...-7.0/collects/racket/private/map.rkt:40:19 loop [48] 95.6% composed [2] 2.3% hash-ref! [54] 0.8% ordinary-value? [67] 0.5% ??? [6] 0.4% ??? [65] 0.2% ulp-difference [86] 0.2% ??? [52] 0.0% --------------------------------------------------------------------------- expand-capturing-lifts [45] 100.0% [49] 334(0.2%) 0(0.0%) dispatch-transformer41 (unknown source) apply-transformer52 [55] 100.0% --------------------------------------------------------------------------- argmin [47] 100.0% [50] 300(0.2%) 0(0.0%) ??? ...erbie/optional-posits/src/points.rkt:212:27 eval-errors [53] 100.0% --------------------------------------------------------------------------- expand-capturing-lifts [45] 100.0% [51] 298(0.2%) 0(0.0%) lambda-clause-expander (unknown source) finish-bodys [56] 100.0% --------------------------------------------------------------------------- loop [48] 0.6% ??? [10] 99.4% [52] 112436(76.6%) 706(0.5%) ??? ...tract/private/arrow-higher-order.rkt:361:33 bf-complex-exp [57] 73.9% bf-complex-div [58] 20.8% bf-complex-neg [59] 3.6% --------------------------------------------------------------------------- ??? [50] 14.2% ??? [38] 85.8% [53] 2112(1.4%) 0(0.0%) eval-errors ...ptional-posits/src/points.rkt:198:0 for-loop [60] 100.0% --------------------------------------------------------------------------- localize-error [22] 7.5% map [69] 22.6% eval-prog [24] 33.8% loop [48] 36.1% [54] 2110(1.4%) 0(0.0%) hash-ref! .../racket/private/more-scheme.rkt:376:2 ??? [4] 36.1% bigfloat-hash [61] 33.8% parse-loop30 [63] 30.1% --------------------------------------------------------------------------- dispatch-transformer41 [49] 100.0% [55] 334(0.2%) 0(0.0%) apply-transformer52 (unknown source) apply-transformer-in-context [64]100.0% --------------------------------------------------------------------------- lambda-clause-expander [51] 33.3% for-loop [62] 66.7% [56] 298(0.2%) 0(0.0%) finish-bodys (unknown source) for-loop [62] 100.0% --------------------------------------------------------------------------- ??? [52] 100.0% [57] 83088(56.6%) 334(0.2%) bf-complex-exp ...l-posits/src/bigcomplex.rkt:37:0 ??? [73] 89.9% bf* [66] 9.7% --------------------------------------------------------------------------- ??? [52] 100.0% [58] 23440(16.0%) 986(0.7%) bf-complex-div ...l-posits/src/bigcomplex.rkt:54:0 ??? [73] 49.2% bf* [66] 38.1% ...higher-order.rkt:361:33 [68] 8.5% --------------------------------------------------------------------------- ??? [52] 100.0% [59] 4036(2.8%) 362(0.2%) bf-complex-neg ...l-posits/src/bigcomplex.rkt:20:0 ??? [73] 91.0% --------------------------------------------------------------------------- eval-errors [53] 100.0% [60] 2112(1.4%) 0(0.0%) for-loop ...e/optional-posits/src/points.rkt:200:2 ??? [65] 71.0% ordinary-value? [67] 14.7% ??? [6] 14.3% --------------------------------------------------------------------------- hash-ref! [54] 100.0% [61] 1474(1.0%) 0(0.0%) bigfloat-hash ...h/private/bigfloat/mpfr.rkt:167:0 sig+exp->bigfloat [70] 50.2% bfcanonicalize [71] 49.8% --------------------------------------------------------------------------- finish-bodys [56] 45.6% eval-one-top12 [33] 54.4% [62] 654(0.4%) 356(0.2%) for-loop (unknown source) finish-bodys [56] 30.4% loop [99] 15.2% --------------------------------------------------------------------------- hash-ref! [54] 100.0% [63] 636(0.4%) 0(0.0%) parse-loop30 ...s/racket/match/compiler.rkt:418:15 map [69] 100.0% --------------------------------------------------------------------------- apply-transformer52 [55] 100.0% [64] 334(0.2%) 0(0.0%) apply-transformer-in-context (unknown source) parse-lambda [72] 100.0% --------------------------------------------------------------------------- ??? [28] 1.3% loop [48] 1.3% inductor [31] 1.7% for-loop [60] 6.7% ??? [20] 6.7% ??? [6] 82.2% [65] 22506(15.3%) 3148(2.1%) ??? ...tract/private/arrow-higher-order.rkt:357:33 bf [74] 46.8% ->bf [75] 23.1% ->flonum [77] 8.0% sample-multi-bounded [79] 6.7% best-alt [82] 1.3% --------------------------------------------------------------------------- bf-complex-exp [57] 47.4% bf-complex-div [58] 52.6% [66] 16976(11.6%) 344(0.2%) bf* ...ath/private/bigfloat/bigfloat-mpfr.rkt:95:0 ??? [73] 98.0% --------------------------------------------------------------------------- for-loop [60] 7.5% loop [46] 16.1% loop [48] 16.2% ??? [38] 23.2% for-loop [21] 37.1% [67] 4136(2.8%) 0(0.0%) ordinary-value? ...ional-posits/src/float.rkt:80:0 special-value? [76] 100.0% --------------------------------------------------------------------------- bf-complex-div [58] 100.0% [68] 1986(1.4%) 420(0.3%) ...higher-order.rkt:361:33 (unknown source) ??? [78] 78.9% --------------------------------------------------------------------------- for-loop [44] 32.1% parse-loop30 [63] 67.9% [69] 936(0.6%) 0(0.0%) map ...t-7.0/collects/racket/private/map.rkt:35:13 hash-ref! [54] 51.0% ??? [81] 32.1% loop [48] 17.0% --------------------------------------------------------------------------- bigfloat-hash [61] 100.0% [70] 740(0.5%) 0(0.0%) sig+exp->bigfloat ...ivate/bigfloat/mpfr.rkt:387:0 new-mpfr [91] 100.0% --------------------------------------------------------------------------- bigfloat-hash [61] 100.0% [71] 734(0.5%) 734(0.5%) bfcanonicalize .../private/bigfloat/mpfr.rkt:157:0 --------------------------------------------------------------------------- apply-transformer-in-context [64]100.0% [72] 334(0.2%) 0(0.0%) parse-lambda ...llects/racket/private/kw.rkt:585:2 stx-pair? [80] 100.0% --------------------------------------------------------------------------- bf-complex-neg [59] 3.4% bf-complex-div [58] 10.7% bf* [66] 15.4% bf-complex-exp [57] 69.4% [73] 107718(73.4%) 70482(48.0%) ??? ...-racket/utils/simple-result-arrow.rkt:39:12 bfmul [83] 22.7% bfneg [84] 11.9% --------------------------------------------------------------------------- ??? [65] 100.0% [74] 10538(7.2%) 0(0.0%) bf ...ath-lib/math/private/bigfloat/mpfr.rkt:601:2 new-mpfr [91] 77.3% ??? [92] 22.7% --------------------------------------------------------------------------- ??? [65] 100.0% [75] 5200(3.5%) 340(0.2%) ->bf ...herbie/optional-posits/src/float.rkt:170:0 for-loop [98] 93.5% --------------------------------------------------------------------------- ordinary-value? [67] 100.0% [76] 4136(2.8%) 616(0.4%) special-value? ...tional-posits/src/float.rkt:76:0 for-loop [98] 85.1% --------------------------------------------------------------------------- ??? [65] 100.0% [77] 1808(1.2%) 302(0.2%) ->flonum ...ie/optional-posits/src/float.rkt:149:0 ??? [85] 83.3% --------------------------------------------------------------------------- ...higher-order.rkt:361:33 [68] 100.0% [78] 1566(1.1%) 1204(0.8%) ??? ...cts/racket/contract/private/list.rkt:209:10 ??? [87] 23.1% --------------------------------------------------------------------------- ??? [65] 100.0% [79] 1514(1.0%) 1188(0.8%) sample-multi-bounded ...posits/src/points.rkt:15:0 for-loop [89] 21.5% --------------------------------------------------------------------------- parse-lambda [72] 100.0% [80] 334(0.2%) 0(0.0%) stx-pair? .../collects/racket/private/stx.rkt:40:4 syntax-e [88] 100.0% --------------------------------------------------------------------------- map [69] 100.0% [81] 300(0.2%) 0(0.0%) ??? ...erbie/optional-posits/src/points.rkt:209:26 ulp-difference [86] 100.0% --------------------------------------------------------------------------- ??? [65] 100.0% [82] 298(0.2%) 0(0.0%) best-alt ...optional-posits/src/mainloop.rkt:106:0 argmins [90] 100.0% --------------------------------------------------------------------------- ??? [73] 100.0% [83] 24442(16.7%) 286(0.2%) bfmul ...-lib/math/private/bigfloat/mpfr.rkt:821:4 new-mpfr [91] 65.9% ??? [92] 32.9% --------------------------------------------------------------------------- ??? [73] 100.0% [84] 12794(8.7%) 0(0.0%) bfneg ...-lib/math/private/bigfloat/mpfr.rkt:618:4 new-mpfr [91] 57.2% ??? [92] 42.8% --------------------------------------------------------------------------- ->flonum [77] 100.0% [85] 1506(1.0%) 300(0.2%) ??? ...s/herbie/optional-posits/src/float.rkt:23:2 for-loop [94] 80.1% --------------------------------------------------------------------------- loop [48] 24.1% ??? [81] 24.4% ??? [38] 51.5% [86] 1228(0.8%) 0(0.0%) ulp-difference ...tional-posits/src/float.rkt:46:0 infer-representation [93] 100.0% --------------------------------------------------------------------------- ??? [38] 45.3% ??? [78] 54.7% [87] 662(0.5%) 362(0.2%) ??? ...ects/racket/contract/private/guts.rkt:746:8 value? [96] 45.3% --------------------------------------------------------------------------- stx-pair? [80] 100.0% [88] 334(0.2%) 0(0.0%) syntax-e (unknown source) syntax-e/no-taint [95] 100.0% --------------------------------------------------------------------------- sample-multi-bounded [79] 100.0% [89] 326(0.2%) 326(0.2%) for-loop ...ie/optional-posits/src/points.rkt:23:4 --------------------------------------------------------------------------- best-alt [82] 100.0% [90] 298(0.2%) 0(0.0%) argmins ...bie/optional-posits/src/common.rkt:92:0 ??? [97] 100.0% --------------------------------------------------------------------------- sig+exp->bigfloat [70] 2.3% bfneg [84] 22.7% bf [74] 25.2% bfmul [83] 49.9% [91] 32322(22.0%) 32322(22.0%) new-mpfr ...b/math/private/bigfloat/mpfr.rkt:335:0 --------------------------------------------------------------------------- bf [74] 15.0% bfneg [84] 34.4% bfmul [83] 50.6% [92] 15906(10.8%) 15906(10.8%) ??? /opt/racket-7.0/collects/ffi/unsafe.rkt:898:4 --------------------------------------------------------------------------- ulp-difference [86] 100.0% [93] 1228(0.8%) 296(0.2%) infer-representation ...-posits/src/float.rkt:15:0 for-loop [98] 75.9% --------------------------------------------------------------------------- ??? [85] 100.0% [94] 1206(0.8%) 902(0.6%) for-loop ...bie/optional-posits/src/float.rkt:24:5 ??? [101] 25.2% --------------------------------------------------------------------------- syntax-e [88] 100.0% [95] 334(0.2%) 0(0.0%) syntax-e/no-taint (unknown source) loop [99] 100.0% --------------------------------------------------------------------------- ??? [87] 100.0% [96] 300(0.2%) 300(0.2%) value? ...ptional-posits/src/syntax/types.rkt:18:0 --------------------------------------------------------------------------- argmins [90] 100.0% [97] 298(0.2%) 0(0.0%) ??? ...bie/optional-posits/src/mainloop.rkt:108:19 errors [29] 100.0% --------------------------------------------------------------------------- infer-representation [93] 10.0% special-value? [76] 37.8% ->bf [75] 52.2% [98] 9312(6.3%) 5546(3.8%) for-loop ...bie/optional-posits/src/float.rkt:17:3 keyword-apply [100] 14.8% ??? [101] 11.0% ??? [102] 7.6% return/no-unsupplied [103] 7.1% --------------------------------------------------------------------------- for-loop [62] 7.6% loop [99] 22.8% syntax-e/no-taint [95] 34.1% eval-prog [24] 35.5% [99] 980(0.7%) 632(0.4%) loop (unknown source) expand-capturing-lifts [45] 35.5% loop [99] 22.8% --------------------------------------------------------------------------- for-loop [98] 100.0% [100] 1374(0.9%) 1374(0.9%) keyword-apply ...lects/racket/private/kw.rkt:421:2 --------------------------------------------------------------------------- for-loop [94] 23.0% for-loop [98] 77.0% [101] 1324(0.9%) 1324(0.9%) ??? ...-7.0/collects/racket/lazy-require.rkt:106:6 --------------------------------------------------------------------------- for-loop [98] 100.0% [102] 712(0.5%) 712(0.5%) ??? ...s/racket/contract/private/arr-i.rkt:1252:29 --------------------------------------------------------------------------- for-loop [98] 100.0% [103] 660(0.4%) 360(0.2%) return/no-unsupplied ...ct/private/arr-i.rkt:534:0 filter [104] 45.5% --------------------------------------------------------------------------- return/no-unsupplied [103] 100.0% [104] 300(0.2%) 300(0.2%) filter ...0/collects/racket/private/list.rkt:256:2 ---------------------------------------------------------------------------