def Gcd.divides_left
import bend-collections-laws-math@1.0.0.0/spec/math/natural.bend as Naturalimport Base
import bend-collections-laws-math@1.0.0.0/src/math/natural.bend as M
134def Gcd.divides_left(+a: Nat, +b: Nat) -> Type:
135 dvd(M.gcd(a, b), a)