Error in 4.1s

Runtime

Time bar (total: 4.1s)Debug logProfile

Please include this information when filing a bug report:

herbie shell --seed 2018195 
(FPCore (x)
  :name "arccos"
  (* 2 (atan (sqrt (/ (- 1 x) (+ 1 x))))))

Backtrace

nan?: contract violation expected: real? given: 0-1iLC
has-nan?/data/pavpan/nightlies/herbie/remove-backup-simplify/src/core/simplify.rkt920
ormap/usr/share/racket/collects/racket/private/map.rkt10513
(unnamed)/usr/share/racket/collects/racket/private/norm-define.rkt5383
core22/usr/share/racket/collects/racket/private/norm-define.rkt5383
(unnamed)/usr/share/racket/collects/racket/private/more-scheme.rkt26128
for-loop/data/pavpan/nightlies/herbie/remove-backup-simplify/src/mainloop.rkt1596
simplify!/data/pavpan/nightlies/herbie/remove-backup-simplify/src/mainloop.rkt1550
run-iter!/data/pavpan/nightlies/herbie/remove-backup-simplify/src/mainloop.rkt2150
for-loop/data/pavpan/nightlies/herbie/remove-backup-simplify/src/mainloop.rkt24910
run-improve50/data/pavpan/nightlies/herbie/remove-backup-simplify/src/mainloop.rkt2340
(unnamed)/usr/share/racket/collects/racket/private/more-scheme.rkt26128
run/usr/share/racket/pkgs/profile-lib/main.rkt392
profile-thunk16/usr/share/racket/pkgs/profile-lib/main.rkt90
(unnamed)/usr/share/racket/collects/racket/private/more-scheme.rkt26128