Exception for Logistic function

Specification

\[0 \leq s \land s \leq 1.0651631\]

\[\begin{array}{l} \\ \frac{1}{1 + e^{\frac{-x}{s}}} \end{array} \]

(FPCore (x s) :precision binary32 (/ 1.0 (+ 1.0 (exp (/ (- x) s)))))

float code(float x, float s) {
	return 1.0f / (1.0f + expf((-x / s)));
}

real(4) function code(x, s)
    real(4), intent (in) :: x
    real(4), intent (in) :: s
    code = 1.0e0 / (1.0e0 + exp((-x / s)))
end function

function code(x, s)
	return Float32(Float32(1.0) / Float32(Float32(1.0) + exp(Float32(Float32(-x) / s))))
end

function tmp = code(x, s)
	tmp = single(1.0) / (single(1.0) + exp((-x / s)));
end

\begin{array}{l}

\\
\frac{1}{1 + e^{\frac{-x}{s}}}
\end{array}

Reproduce

herbie shell --seed 2024298 
(FPCore (x s)
  :name "Logistic function"
  :precision binary32
  :pre (and (<= 0.0 s) (<= s 1.0651631))
  (/ 1.0 (+ 1.0 (exp (/ (- x) s)))))

Please file a bug report with this information.

Backtrace

hash-set!: contract violation expected: (and/c hash? (not/c immutable?)) given: #<procedure:id->egglog> argument position: 1st other arguments...: '!= 'Neq		L	C
platform-spec-nodes	/home/nightlies/herbie/varun10p-egglog/src/core/egglog-herbie.rkt	111	0
prelude	/home/nightlies/herbie/varun10p-egglog/src/core/egglog-herbie.rkt	75	0
run-improve!	/home/nightlies/herbie/varun10p-egglog/src/core/mainloop.rkt	46	0
get-alternatives/report	/home/nightlies/herbie/varun10p-egglog/src/api/sandbox.rkt	186	0
(unnamed)	/home/nightlies/herbie/varun10p-egglog/src/api/sandbox.rkt	282	6
(unnamed)	/usr/share/racket/pkgs/profile-lib/main.rkt	40	10
profile-thunk	/usr/share/racket/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/usr/share/racket/collects/racket/engine.rkt	42	24