def u64_checked_sub

bend-collections-laws-math@1.0.0.0 · src/math/fixed.bend:305

import 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

305def u64_checked_sub(+a: W.U64, +b: W.U64) -> Maybe<&2, W.U64>:
306  opt(W.U64, X.lt(a, b), X.sub(a, b))