Exception for Toniolo and Linder, Equation (7)

Math

\[\frac{\sqrt{2} \cdot t}{\sqrt{\frac{x + 1}{x - 1} \cdot \left(\ell \cdot \ell + 2 \cdot \left(t \cdot t\right)\right) - \ell \cdot \ell}}\]

C

double f(double x, double l, double t) {
        double r803636 = 2.0;
        double r803637 = sqrt(r803636);
        double r803638 = t;
        double r803639 = r803637 * r803638;
        double r803640 = x;
        double r803641 = 1.0;
        double r803642 = r803640 + r803641;
        double r803643 = r803640 - r803641;
        double r803644 = r803642 / r803643;
        double r803645 = l;
        double r803646 = r803645 * r803645;
        double r803647 = r803638 * r803638;
        double r803648 = r803636 * r803647;
        double r803649 = r803646 + r803648;
        double r803650 = r803644 * r803649;
        double r803651 = r803650 - r803646;
        double r803652 = sqrt(r803651);
        double r803653 = r803639 / r803652;
        return r803653;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019173 
(FPCore (x l t)
  :name "Toniolo and Linder, Equation (7)"
  (/ (* (sqrt 2.0) t) (sqrt (- (* (/ (+ x 1.0) (- x 1.0)) (+ (* l l) (* 2.0 (* t t)))) (* l l)))))

Backtrace

hash-ref: no value found for key key: #<enode 444(444)>		L	C
for-loop	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	197	2
extractor-extract	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	196	0
for-loop	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	35	2
(unnamed)	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	26	0
simplify!	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	217	0
run-iter!	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	320	0
for-loop	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	354	4
run-improve43	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	339	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