Exception for Main:z from

Math

\[\left(\left(\left(\sqrt{x + 1} - \sqrt{x}\right) + \left(\sqrt{y + 1} - \sqrt{y}\right)\right) + \left(\sqrt{z + 1} - \sqrt{z}\right)\right) + \left(\sqrt{t + 1} - \sqrt{t}\right)\]

C

double f(double x, double y, double z, double t) {
        double r10310 = x;
        double r10311 = 1.0;
        double r10312 = r10310 + r10311;
        double r10313 = sqrt(r10312);
        double r10314 = sqrt(r10310);
        double r10315 = r10313 - r10314;
        double r10316 = y;
        double r10317 = r10316 + r10311;
        double r10318 = sqrt(r10317);
        double r10319 = sqrt(r10316);
        double r10320 = r10318 - r10319;
        double r10321 = r10315 + r10320;
        double r10322 = z;
        double r10323 = r10322 + r10311;
        double r10324 = sqrt(r10323);
        double r10325 = sqrt(r10322);
        double r10326 = r10324 - r10325;
        double r10327 = r10321 + r10326;
        double r10328 = t;
        double r10329 = r10328 + r10311;
        double r10330 = sqrt(r10329);
        double r10331 = sqrt(r10328);
        double r10332 = r10330 - r10331;
        double r10333 = r10327 + r10332;
        return r10333;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019173 +o rules:numerics
(FPCore (x y z t)
  :name "Main:z from "

  :herbie-target
  (+ (+ (+ (/ 1.0 (+ (sqrt (+ x 1.0)) (sqrt x))) (/ 1.0 (+ (sqrt (+ y 1.0)) (sqrt y)))) (/ 1.0 (+ (sqrt (+ z 1.0)) (sqrt z)))) (- (sqrt (+ t 1.0)) (sqrt t)))

  (+ (+ (+ (- (sqrt (+ x 1.0)) (sqrt x)) (- (sqrt (+ y 1.0)) (sqrt y))) (- (sqrt (+ z 1.0)) (sqrt z))) (- (sqrt (+ t 1.0)) (sqrt t))))

Backtrace

atab-pick-alt: contract violation expected: alt? given: '(#<alt (λ (x y z t) (+ (- (sqrt (+ 1.0 x)) (sqrt x)) (+ (+ (- (sqrt (+ z 1.0)) (sqrt z)) (- (sqrt (+ t 1.0)) (sqrt t))) (- (sqrt (+ 1.0 y)) (sqrt y)))))>) in: the range of the #:picking-func argument of (-> alt-table? #:only-fresh boolean? #:picking-func (-> (listof alt?) alt?) (values alt? alt-table?)) contract from: /data/pavpan/nightlies/herbie/no-costs-2/src/core/alt-table.rkt blaming: /data/pavpan/nightlies/herbie/no-costs-2/src/mainloop.rkt (assuming the contract is correct) at: /data/pavpan/nightlies/herbie/no-costs-2/src/core/alt-table.rkt:13.3		L	C
raise-blame-error16	/opt/racket-7.0/collects/racket/contract/private/blame.rkt	347	0
(unnamed)	/data/pavpan/nightlies/herbie/no-costs-2/src/core/alt-table.rkt	59	0
(unnamed)	/opt/racket-7.0/collects/racket/contract/private/arrow-val-first.rkt	388	18
choose-best-alt!	/data/pavpan/nightlies/herbie/no-costs-2/src/mainloop.rkt	110	0
run-iter!	/data/pavpan/nightlies/herbie/no-costs-2/src/mainloop.rkt	319	0
for-loop	/data/pavpan/nightlies/herbie/no-costs-2/src/mainloop.rkt	353	4
run-improve43	/data/pavpan/nightlies/herbie/no-costs-2/src/mainloop.rkt	338	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