Exception for Quotient of sum of exps

Specification

\[\begin{array}{l} \\ \frac{e^{a}}{e^{a} + e^{b}} \end{array} \]

(FPCore (a b) :precision binary64 (/ (exp a) (+ (exp a) (exp b))))

double code(double a, double b) {
	return exp(a) / (exp(a) + exp(b));
}

real(8) function code(a, b)
    real(8), intent (in) :: a
    real(8), intent (in) :: b
    code = exp(a) / (exp(a) + exp(b))
end function

public static double code(double a, double b) {
	return Math.exp(a) / (Math.exp(a) + Math.exp(b));
}

def code(a, b):
	return math.exp(a) / (math.exp(a) + math.exp(b))

function code(a, b)
	return Float64(exp(a) / Float64(exp(a) + exp(b)))
end

function tmp = code(a, b)
	tmp = exp(a) / (exp(a) + exp(b));
end

code[a_, b_] := N[(N[Exp[a], $MachinePrecision] / N[(N[Exp[a], $MachinePrecision] + N[Exp[b], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

\begin{array}{l}

\\
\frac{e^{a}}{e^{a} + e^{b}}
\end{array}

Reproduce

herbie shell --seed 2024309 
(FPCore (a b)
  :name "Quotient of sum of exps"
  :precision binary64

  :alt
  (! :herbie-platform default (/ 1 (+ 1 (exp (- b a)))))

  (/ (exp a) (+ (exp a) (exp b))))

Please file a bug report with this information.

Backtrace

rest: contract violation expected: (and/c list? (not/c empty?)) given: '()		L	C
initial-simplify	/home/nightlies/herbie/aditya-make-egglog-runner/src/core/preprocess.rkt	60	0
find-preprocessing	/home/nightlies/herbie/aditya-make-egglog-runner/src/core/preprocess.rkt	91	0
run-improve!	/home/nightlies/herbie/aditya-make-egglog-runner/src/core/mainloop.rkt	46	0
get-alternatives/report	/home/nightlies/herbie/aditya-make-egglog-runner/src/api/sandbox.rkt	186	0
(unnamed)	/home/nightlies/herbie/aditya-make-egglog-runner/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

could not determine a ground truth (more)

Specification

Reproduce

Backtrace