Exception for ENA, Section 1.4, Exercise 4a

Specification

\[-1 \leq x \land x \leq 1\]

\[\begin{array}{l} \\ \frac{x - \sin x}{\tan x} \end{array} \]

(FPCore (x) :precision binary64 (/ (- x (sin x)) (tan x)))

double code(double x) {
	return (x - sin(x)) / tan(x);
}

real(8) function code(x)
    real(8), intent (in) :: x
    code = (x - sin(x)) / tan(x)
end function

public static double code(double x) {
	return (x - Math.sin(x)) / Math.tan(x);
}

def code(x):
	return (x - math.sin(x)) / math.tan(x)

function code(x)
	return Float64(Float64(x - sin(x)) / tan(x))
end

function tmp = code(x)
	tmp = (x - sin(x)) / tan(x);
end

code[x_] := N[(N[(x - N[Sin[x], $MachinePrecision]), $MachinePrecision] / N[Tan[x], $MachinePrecision]), $MachinePrecision]

\begin{array}{l}

\\
\frac{x - \sin x}{\tan x}
\end{array}

Reproduce

herbie shell --seed 2024246 
(FPCore (x)
  :name "ENA, Section 1.4, Exercise 4a"
  :precision binary64
  :pre (and (<= -1.0 x) (<= x 1.0))

  :alt
  (! :herbie-platform default (* 1/6 (* x x)))

  (/ (- x (sin x)) (tan x)))

Please file a bug report with this information.

Backtrace

map: contract violation expected: list? given: '((-.f64 x (sin.f64 x)) . #hasheq((errs . (1 1 1 1 1924870378811965018 3072412566590415620 2435946881071148612 2827428694638304781 1 1 1 1 1 1 1 2883948005429941622 1 1 1 1 1659534357508664757 1 1 1710443275826482087 1 1 942134006004834073 1 20021368164...		L	C
gen-map	/usr/local/racket/collects/racket/private/map.rkt	257	2
actual-errors	/home/nightlies/herbie/zane-concrete-values/src/core/explain.rkt	35	0
generate-timelines	/home/nightlies/herbie/zane-concrete-values/src/core/explain.rkt	493	0
explain!	/home/nightlies/herbie/zane-concrete-values/src/core/mainloop.rkt	322	0
run-improve!	/home/nightlies/herbie/zane-concrete-values/src/core/mainloop.rkt	44	0
get-alternatives/report	/home/nightlies/herbie/zane-concrete-values/src/api/sandbox.rkt	186	0
(unnamed)	/home/nightlies/herbie/zane-concrete-values/src/api/sandbox.rkt	282	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