Text.Parsec.Token:makeTokenParser from parsec-3.1.9, A

Specification

?
\[\begin{array}{l} \\ \frac{x + y}{10} \end{array} \]
(FPCore (x y) :precision binary64 (/ (+ x y) 10.0))
double code(double x, double y) {
	return (x + y) / 10.0;
}
real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = (x + y) / 10.0d0
end function
public static double code(double x, double y) {
	return (x + y) / 10.0;
}
def code(x, y):
	return (x + y) / 10.0
function code(x, y)
	return Float64(Float64(x + y) / 10.0)
end
function tmp = code(x, y)
	tmp = (x + y) / 10.0;
end
code[x_, y_] := N[(N[(x + y), $MachinePrecision] / 10.0), $MachinePrecision]
\begin{array}{l}

\\
\frac{x + y}{10}
\end{array}

Reproduce

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herbie shell --seed 2024196 
(FPCore (x y)
  :name "Text.Parsec.Token:makeTokenParser from parsec-3.1.9, A"
  :precision binary64
  (/ (+ x y) 10.0))

Please file a bug report with this information.

Backtrace

vector-set!: contract violation expected: exact-nonnegative-integer? given: -1 argument position: 2nd first argument...: '#(#f #t #f #f #f #t #f #f #f #f #f #f #f #f #f)LC
backward-pass/home/nightlies/rival/main/eval/adjust.rkt80
rival-machine-adjust/home/nightlies/rival/main/eval/run.rkt980
rival-machine-full/home/nightlies/rival/main/eval/main.rkt160
rival-apply/home/nightlies/rival/main/eval/main.rkt560
(unnamed)/usr/local/racket/collects/racket/contract/private/arrow-val-first.rkt48618
(unnamed)/home/nightlies/herbie/main/src/sampling.rkt1594
ival-eval/home/nightlies/herbie/main/src/sampling.rkt1530
<eval-prog-real>/home/nightlies/herbie/main/src/sampling.rkt1882
compute-local-errors/home/nightlies/herbie/main/src/core/localize.rkt1050
batch-localize-errors/home/nightlies/herbie/main/src/core/localize.rkt910
localize!/home/nightlies/herbie/main/src/mainloop.rkt1870
run-iter!/home/nightlies/herbie/main/src/mainloop.rkt700
mutate!/home/nightlies/herbie/main/src/mainloop.rkt620
run-improve!/home/nightlies/herbie/main/src/mainloop.rkt480
get-alternatives/report/home/nightlies/herbie/main/src/sandbox.rkt1670
(unnamed)/home/nightlies/herbie/main/src/sandbox.rkt2616
(unnamed)/usr/local/racket/share/pkgs/profile-lib/main.rkt4010
profile-thunk/usr/local/racket/share/pkgs/profile-lib/main.rkt90
(unnamed)/usr/local/racket/collects/racket/engine.rkt4224