Exception for (- (/ x0 (- 1 x1)) x0)

Specification

\[x0 = 1.855 \land x1 = 0.000209 \lor x0 = 2.985 \land x1 = 0.0186\]

Math

\[\begin{array}{l} \\ \frac{x0}{1 - x1} - x0 \end{array} \]

FPCore

(FPCore (x0 x1) :precision binary64 (- (/ x0 (- 1.0 x1)) x0))

C

double code(double x0, double x1) {
	return (x0 / (1.0 - x1)) - x0;
}

Fortran

real(8) function code(x0, x1)
    real(8), intent (in) :: x0
    real(8), intent (in) :: x1
    code = (x0 / (1.0d0 - x1)) - x0
end function

Java

public static double code(double x0, double x1) {
	return (x0 / (1.0 - x1)) - x0;
}

Python

def code(x0, x1):
	return (x0 / (1.0 - x1)) - x0

Julia

function code(x0, x1)
	return Float64(Float64(x0 / Float64(1.0 - x1)) - x0)
end

MATLAB

function tmp = code(x0, x1)
	tmp = (x0 / (1.0 - x1)) - x0;
end

Wolfram

code[x0_, x1_] := N[(N[(x0 / N[(1.0 - x1), $MachinePrecision]), $MachinePrecision] - x0), $MachinePrecision]

Reproduce

herbie shell --seed 2024170 
(FPCore (x0 x1)
  :name "(- (/ x0 (- 1 x1)) x0)"
  :precision binary64
  :pre (or (and (== x0 1.855) (== x1 0.000209)) (and (== x0 2.985) (== x1 0.0186)))

  :alt
  (! :herbie-platform default (/ (* x0 x1) (- 1 x1)))

  (- (/ x0 (- 1.0 x1)) x0))

Please file a bug report with this information.

Backtrace

timeline-push!: contract violation expected: jsexpr? given: '#hash((#t . 5.877471754111438e-39) (unknown . 5.877471754111438e-39) (precondition . 1.0) (valid . 0.0)) in: the repeated argument of (-> symbol? jsexpr? ... void?) contract from: <pkgs>/herbie/timeline.rkt blaming: <pkgs>/herbie/searchreals.rkt (assuming the contract is correct) at: <pkgs>/herbie/timeline.rkt:10:3		L	C
raise-blame-error	/usr/local/racket/collects/racket/contract/private/blame.rkt	346	0
loop	/usr/local/racket/collects/racket/contract/private/list.rkt	991	12
(unnamed)	.../private/arrow-val-first.rkt	486	18
find-intervals	/home/nightlies/herbie/zane-job-abstraction3/src/searchreals.rkt	86	0
make-sampler	/home/nightlies/herbie/zane-job-abstraction3/src/sampling.rkt	110	0
sample-points	/home/nightlies/herbie/zane-job-abstraction3/src/sampling.rkt	244	0
setup-context!	/home/nightlies/herbie/zane-job-abstraction3/src/mainloop.rkt	45	0
get-alternatives/report	/home/nightlies/herbie/zane-job-abstraction3/src/sandbox.rkt	166	0
(unnamed)	/home/nightlies/herbie/zane-job-abstraction3/src/sandbox.rkt	260	6
(unnamed)	/usr/local/racket/share/pkgs/profile-lib/main.rkt	40	10
profile-thunk	/usr/local/racket/share/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/usr/local/racket/collects/racket/engine.rkt	42	24