\[\alpha \gt -1 \land \beta \gt -1\]

\[\frac{\left(\left(\frac{\left(\beta - \alpha\right)}{\left(\left(\alpha + \beta\right) + 2\right)}\right) + 1\right)}{2}\]

\frac{\left(\left(\frac{\left(\beta - \alpha\right)}{\left(\left(\alpha + \beta\right) + 2\right)}\right) + 1\right)}{2}

double f(double alpha, double beta) {
        double r5887870 = beta;
        double r5887871 = alpha;
        double r5887872 = r5887870 - r5887871;
        double r5887873 = r5887871 + r5887870;
        double r5887874 = /* ERROR: no support for value #<cpointer:posit16> in C */;
        double r5887875 = r5887873 + r5887874;
        double r5887876 = r5887872 / r5887875;
        double r5887877 = /* ERROR: no support for value #<cpointer:posit16> in C */;
        double r5887878 = r5887876 + r5887877;
        double r5887879 = /* ERROR: no support for value #<cpointer:posit16> in C */;
        double r5887880 = r5887878 / r5887879;
        return r5887880;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 0 
(FPCore (alpha beta)
  :name "Octave 3.8, jcobi/1"
  :pre (and (>.p16 alpha #<cpointer:posit16>) (>.p16 beta #<cpointer:posit16>))
  (/.p16 (+.p16 (/.p16 (-.p16 beta alpha) (+.p16 (+.p16 alpha beta) #<cpointer:posit16>)) #<cpointer:posit16>) #<cpointer:posit16>))

Backtrace

hash-ref: no value found for key key: '(#<cpointer:posit16> #<cpointer:posit16>)		L	C
best-and-tied-at-points	/home/p92/nightlies/herbie/optional-posits/src/core/alt-table.rkt	117	0
atab-add-altn	/home/p92/nightlies/herbie/optional-posits/src/core/alt-table.rkt	202	0
for-loop	/home/p92/nightlies/herbie/optional-posits/src/core/alt-table.rkt	56	2
(unnamed)	/opt/racket-7.0/collects/racket/contract/private/arrow-val-first.rkt	388	18
finalize-iter!	/home/p92/nightlies/herbie/optional-posits/src/mainloop.rkt	272	0
run-iter!	/home/p92/nightlies/herbie/optional-posits/src/mainloop.rkt	321	0
for-loop	/home/p92/nightlies/herbie/optional-posits/src/mainloop.rkt	355	4
run-improve43	/home/p92/nightlies/herbie/optional-posits/src/mainloop.rkt	340	0
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28