Exception for bug329 (missed optimization)

Specification

\[x \geq 0\]

Math

\[\begin{array}{l} \\ \tan^{-1} \left(\frac{y}{x}\right) \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (atan (/ y x)))

C

double code(double x, double y) {
	return atan((y / x));
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = atan((y / x))
end function

Java

public static double code(double x, double y) {
	return Math.atan((y / x));
}

Python

def code(x, y):
	return math.atan((y / x))

Julia

function code(x, y)
	return atan(Float64(y / x))
end

MATLAB

function tmp = code(x, y)
	tmp = atan((y / x));
end

Wolfram

code[x_, y_] := N[ArcTan[N[(y / x), $MachinePrecision]], $MachinePrecision]

Reproduce

herbie shell --seed 2024271 
(FPCore (x y)
  :name "bug329 (missed optimization)"
  :precision binary64
  :pre (>= x 0.0)

  :alt
  (! :herbie-platform default (atan2 y x))

  (atan (/ y x)))

Please file a bug report with this information.

Backtrace

error: contract violation expected: string? given: 'atan.f64		L	C
f407	.../match/compiler.rkt	559	40
loop	.../private/map.rkt	40	19
loop	.../private/map.rkt	40	19
loop	.../private/map.rkt	40	19
loop	.../private/map.rkt	40	19
compile-expr	/home/nightlies/herbie/bhargav-log-space/src/core/explain.rkt	80	0
explain	/home/nightlies/herbie/bhargav-log-space/src/core/explain.rkt	650	0
explain!	/home/nightlies/herbie/bhargav-log-space/src/core/mainloop.rkt	323	0
run-improve!	/home/nightlies/herbie/bhargav-log-space/src/core/mainloop.rkt	45	0
get-alternatives/report	/home/nightlies/herbie/bhargav-log-space/src/api/sandbox.rkt	186	0
(unnamed)	/home/nightlies/herbie/bhargav-log-space/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