U64int.fv: def of bend-collections-laws-math@1.0.0.0
Import: import bend-collections-laws-math@1.0.0.0/proofs/math/typed/u64int.bend as U64int
Lines 907-913 of bend-collections-laws-math@1.0.0.0/proofs/math/typed/u64int.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-math@1.0.0.0/proofs/math/typed/u64int.bend&start_line=907&end_line=913

import Base

# y when ok, else x: {fv(ok, v(a), x) == x} says v(a) == x when ok
def fv(ok: Bool, +y: Nat, +x: Nat) -> Nat:
  match ok:
    case True{}:
      y
    case False{}:
      x

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat