Exception for Language.Haskell.HsColour.ColourHighlight:unbase from hscolour-1.23

Math

\[\left(x \cdot y + z\right) \cdot y + t\]

C

double f(double x, double y, double z, double t) {
        double r8180 = x;
        double r8181 = y;
        double r8182 = r8180 * r8181;
        double r8183 = z;
        double r8184 = r8182 + r8183;
        double r8185 = r8184 * r8181;
        double r8186 = t;
        double r8187 = r8185 + r8186;
        return r8187;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 +o rules:numerics
(FPCore (x y z t)
  :name "Language.Haskell.HsColour.ColourHighlight:unbase from hscolour-1.23"
  (+ (* (+ (* x y) z) y) t))

Backtrace

get-representation: Unknown representation #f		L	C
loop	/data/pavpan/nightlies/herbie/interface2/src/points.rkt	122	4
prepare-points	/data/pavpan/nightlies/herbie/interface2/src/points.rkt	146	0
setup-prog!34	/data/pavpan/nightlies/herbie/interface2/src/mainloop.rkt	67	0
run-improve43	/data/pavpan/nightlies/herbie/interface2/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