Exception for NMSE Section 6.1 mentioned, B

Math

\[\left(\frac{\pi}{2} \cdot \frac{1}{b \cdot b - a \cdot a}\right) \cdot \left(\frac{1}{a} - \frac{1}{b}\right)\]

C

double f(double a, double b) {
        double r8148 = atan2(1.0, 0.0);
        double r8149 = 2.0;
        double r8150 = r8148 / r8149;
        double r8151 = 1.0;
        double r8152 = b;
        double r8153 = r8152 * r8152;
        double r8154 = a;
        double r8155 = r8154 * r8154;
        double r8156 = r8153 - r8155;
        double r8157 = r8151 / r8156;
        double r8158 = r8150 * r8157;
        double r8159 = r8151 / r8154;
        double r8160 = r8151 / r8152;
        double r8161 = r8159 - r8160;
        double r8162 = r8158 * r8161;
        return r8162;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019194 
(FPCore (a b)
  :name "NMSE Section 6.1 mentioned, B"
  (* (* (/ PI 2.0) (/ 1.0 (- (* b b) (* a a)))) (- (/ 1.0 a) (/ 1.0 b))))

Backtrace

result arity mismatch; expected number of values not received expected: 2 received: 1 in: local-binding form values...: 0		L	C
loop	/data/pavpan/nightlies/herbie/various-cleanup/src/core/extraction.rkt	25	2
(unnamed)	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	26	0
simplify!	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	220	0
run-improve47	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	342	0
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28
run	/opt/racket-7.0/share/pkgs/profile-lib/main.rkt	39	2
profile-thunk16	/opt/racket-7.0/share/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28