def FProd.fold

bend-collections-laws-crypto@1.0.0.0 · spec/math/generic.bend:260

import Base
import bend-collections-laws-crypto@1.0.0.0/src/math/num.bend as N
import bend-collections-laws-crypto@1.0.0.0/src/math/generic.bend as G

260def FProd.fold(~T: Data, ~op: N.Op<T> -> T, ~test: N.Test<T> -> Bool, xs: List<&2, T>) -> Type:
261  {G.prod(~T, ~op, ~test, xs) == Done{fold_mul(~T, ~op, xs, op(N.One{}))} : Result<&2, &2, N.NumError, T>}