Natfuel.ends: def of bend-collections-laws-math@1.0.0.0
Import: import bend-collections-laws-math@1.0.0.0/proofs/math/typed/natfuel.bend as Natfuel
Lines 30-40 of bend-collections-laws-math@1.0.0.0/proofs/math/typed/natfuel.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-math@1.0.0.0/proofs/math/typed/natfuel.bend&start_line=30&end_line=40

import Base

# the Nat loop reaches b == 0 within f steps
def ends(f: Nat, +a: Nat, +b: Nat) -> Bool:
  match f b:
    case 0n 0n:
      True{}
    case 0n 1n+bp:
      False{}
    case 1n+g 0n:
      True{}
    case 1n+g 1n+ +bp:
      ends(g, 1n+bp, Nat.mod(a, 1n+bp))

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.mod