def bl_zero
import bend-collections-laws-math@1.0.0.0/proofs/math/typed/natfuel.bend as Natfuelimport Base
import bend-collections-laws-math@1.0.0.0/src/math/natural.bend as M
175def bl_zero(+f: Nat, +k: Nat) -> {M.bit_length_go(f, 0n, k) == k : Nat}:
176 match f:
177 case 0n:
178 {==}
179 case 1n+g:
180 {==}