\[\left(\frac{1.0}{\sqrt{\pi}} \cdot e^{\left|x\right| \cdot \left|x\right|}\right) \cdot \left(\left(\left(\frac{1.0}{\left|x\right|} + \frac{1.0}{2.0} \cdot \left(\left(\frac{1.0}{\left|x\right|} \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right)\right) + \frac{3.0}{4.0} \cdot \left(\left(\left(\left(\frac{1.0}{\left|x\right|} \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right)\right) + \frac{15.0}{8.0} \cdot \left(\left(\left(\left(\left(\left(\frac{1.0}{\left|x\right|} \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right)\right)\]

\left(\frac{1.0}{\sqrt{\pi}} \cdot e^{\left|x\right| \cdot \left|x\right|}\right) \cdot \left(\left(\left(\frac{1.0}{\left|x\right|} + \frac{1.0}{2.0} \cdot \left(\left(\frac{1.0}{\left|x\right|} \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right)\right) + \frac{3.0}{4.0} \cdot \left(\left(\left(\left(\frac{1.0}{\left|x\right|} \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right)\right) + \frac{15.0}{8.0} \cdot \left(\left(\left(\left(\left(\left(\frac{1.0}{\left|x\right|} \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right) \cdot \frac{1.0}{\left|x\right|}\right)\right)

double f(double x) {
        double r4105449 = 1.0;
        double r4105450 = atan2(1.0, 0.0);
        double r4105451 = sqrt(r4105450);
        double r4105452 = r4105449 / r4105451;
        double r4105453 = x;
        double r4105454 = fabs(r4105453);
        double r4105455 = r4105454 * r4105454;
        double r4105456 = exp(r4105455);
        double r4105457 = r4105452 * r4105456;
        double r4105458 = r4105449 / r4105454;
        double r4105459 = 2.0;
        double r4105460 = r4105449 / r4105459;
        double r4105461 = r4105458 * r4105458;
        double r4105462 = r4105461 * r4105458;
        double r4105463 = r4105460 * r4105462;
        double r4105464 = r4105458 + r4105463;
        double r4105465 = 3.0;
        double r4105466 = 4.0;
        double r4105467 = r4105465 / r4105466;
        double r4105468 = r4105462 * r4105458;
        double r4105469 = r4105468 * r4105458;
        double r4105470 = r4105467 * r4105469;
        double r4105471 = r4105464 + r4105470;
        double r4105472 = 15.0;
        double r4105473 = 8.0;
        double r4105474 = r4105472 / r4105473;
        double r4105475 = r4105469 * r4105458;
        double r4105476 = r4105475 * r4105458;
        double r4105477 = r4105474 * r4105476;
        double r4105478 = r4105471 + r4105477;
        double r4105479 = r4105457 * r4105478;
        return r4105479;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019165 
(FPCore (x)
  :name "Jmat.Real.erfi, branch x greater than or equal to 5"
  (* (* (/ 1.0 (sqrt PI)) (exp (* (fabs x) (fabs x)))) (+ (+ (+ (/ 1.0 (fabs x)) (* (/ 1.0 2.0) (* (* (/ 1.0 (fabs x)) (/ 1.0 (fabs x))) (/ 1.0 (fabs x))))) (* (/ 3.0 4.0) (* (* (* (* (/ 1.0 (fabs x)) (/ 1.0 (fabs x))) (/ 1.0 (fabs x))) (/ 1.0 (fabs x))) (/ 1.0 (fabs x))))) (* (/ 15.0 8.0) (* (* (* (* (* (* (/ 1.0 (fabs x)) (/ 1.0 (fabs x))) (/ 1.0 (fabs x))) (/ 1.0 (fabs x))) (/ 1.0 (fabs x))) (/ 1.0 (fabs x))) (/ 1.0 (fabs x)))))))

Backtrace

->bf: contract violation expected: value? given: 'PI in: the 1st argument of (-> value? bigvalue?) contract from: (function ->bf) blaming: /data/pavpan/nightlies/herbie/optional-posits/src/float.rkt (assuming the contract is correct) at: /data/pavpan/nightlies/herbie/optional-posits/src/float.rkt:163.18		L	C
raise-blame-error16	/opt/racket-7.0/collects/racket/contract/private/blame.rkt	347	0
(unnamed)	/opt/racket-7.0/collects/racket/contract/private/arrow-higher-order.rkt	357	33
(unnamed)	/data/pavpan/nightlies/herbie/optional-posits/src/core/localize.rkt	22	13
hash-ref!	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	376	2
map	/opt/racket-7.0/collects/racket/private/map.rkt	35	13
f9	/opt/racket-7.0/collects/racket/match/compiler.rkt	507	40
hash-ref!	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	376	2
loop	/opt/racket-7.0/collects/racket/private/map.rkt	40	19
parse-loop15	/opt/racket-7.0/collects/racket/match/compiler.rkt	418	15
hash-ref!	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	376	2
loop	/opt/racket-7.0/collects/racket/private/map.rkt	40	19
parse-loop15	/opt/racket-7.0/collects/racket/match/compiler.rkt	418	15
hash-ref!	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	376	2
loop	/opt/racket-7.0/collects/racket/private/map.rkt	40	19
parse-loop15	/opt/racket-7.0/collects/racket/match/compiler.rkt	418	15
hash-ref!	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	376	2
loop	/opt/racket-7.0/collects/racket/private/map.rkt	40	19
parse-loop15	/opt/racket-7.0/collects/racket/match/compiler.rkt	418	15
hash-ref!	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	376	2
localize-error	/data/pavpan/nightlies/herbie/optional-posits/src/core/localize.rkt	52	0
localize!	/data/pavpan/nightlies/herbie/optional-posits/src/mainloop.rkt	116	0
run-iter!	/data/pavpan/nightlies/herbie/optional-posits/src/mainloop.rkt	317	0
for-loop	/data/pavpan/nightlies/herbie/optional-posits/src/mainloop.rkt	351	4
run-improve40	/data/pavpan/nightlies/herbie/optional-posits/src/mainloop.rkt	336	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