\[\left(\left(\left(\left(\left(\left(x \cdot 18\right) \cdot y\right) \cdot z\right) \cdot t - \left(a \cdot 4\right) \cdot t\right) + b \cdot c\right) - \left(x \cdot 4\right) \cdot i\right) - \left(j \cdot 27\right) \cdot k\]

\left(\left(\left(\left(\left(\left(x \cdot 18\right) \cdot y\right) \cdot z\right) \cdot t - \left(a \cdot 4\right) \cdot t\right) + b \cdot c\right) - \left(x \cdot 4\right) \cdot i\right) - \left(j \cdot 27\right) \cdot k

double f(double x, double y, double z, double t, double a, double b, double c, double i, double j, double k) {
        double r8484 = x;
        double r8485 = 18.0;
        double r8486 = r8484 * r8485;
        double r8487 = y;
        double r8488 = r8486 * r8487;
        double r8489 = z;
        double r8490 = r8488 * r8489;
        double r8491 = t;
        double r8492 = r8490 * r8491;
        double r8493 = a;
        double r8494 = 4.0;
        double r8495 = r8493 * r8494;
        double r8496 = r8495 * r8491;
        double r8497 = r8492 - r8496;
        double r8498 = b;
        double r8499 = c;
        double r8500 = r8498 * r8499;
        double r8501 = r8497 + r8500;
        double r8502 = r8484 * r8494;
        double r8503 = i;
        double r8504 = r8502 * r8503;
        double r8505 = r8501 - r8504;
        double r8506 = j;
        double r8507 = 27.0;
        double r8508 = r8506 * r8507;
        double r8509 = k;
        double r8510 = r8508 * r8509;
        double r8511 = r8505 - r8510;
        return r8511;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019173 +o rules:numerics
(FPCore (x y z t a b c i j k)
  :name "Diagrams.Solve.Polynomial:cubForm  from diagrams-solve-0.1"
  (- (- (+ (- (* (* (* (* x 18.0) y) z) t) (* (* a 4.0) t)) (* b c)) (* (* x 4.0) i)) (* (* j 27.0) k)))

Backtrace

atab-pick-alt: contract violation expected: alt? given: '(#<alt (λ (x y z t a b c i j k) (fma b c (- (* t (* (* (* x 18.0) y) z)) (fma 4.0 (fma t a (* x i)) (* (* 27.0 j) k)))))>) 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