Please include this information when filing a bug report:
herbie shell --seed 2019067
(FPCore (x0 x1)
:name "(- (/ x0 (- 1 x1)) x0)"
:pre (or (and (== x0 1.855) (== x1 0.000209)) (and (== x0 2.985) (== x1 0.0186)))
:herbie-target
(/ (* x0 x1) (- 1 x1))
(- (/ x0 (- 1 x1)) x0))
| build-list: contract violation expected: exact-nonnegative-integer? given: '(0) | L | C | |
|---|---|---|---|
| build-list | /opt/racket-7.0/collects/racket/private/list.rkt | 296 | 2 |
| debug-print | /data/pavpan/nightlies/herbie/develop/src/debug.rkt | 107 | 0 |
| run-improve43 | /data/pavpan/nightlies/herbie/develop/src/mainloop.rkt | 346 | 0 |
| (unnamed) | /opt/racket-7.0/collects/racket/private/more-scheme.rkt | 261 | 28 |
| run | /opt/racket-7.0/share/pkgs/profile-lib/main.rkt | 39 | 2 |
| profile-thunk16 | /opt/racket-7.0/share/pkgs/profile-lib/main.rkt | 9 | 0 |
| (unnamed) | /opt/racket-7.0/collects/racket/private/more-scheme.rkt | 261 | 28 |