def u64_checked_mul
import bend-collections-laws-math@1.0.0.0/src/math/fixed.bend as Fixedimport Base
import bend-collections-laws-math@1.0.0.0/src/math/u64.bend as W
import bend-collections-laws-math@1.0.0.0/src/math/w64.bend as X
317def u64_checked_mul(+a: W.U64, +b: W.U64) -> Maybe<&2, W.U64>:
318 opt(W.U64, X.mul_over(a, b), X.mul(a, b))