def AP.padz
import bend-osdev-array@0.1.0.1/PROOF.bend as PROOFimport Base
393def AP.padz(n: Nat) -> {Word.shr.pad(n, Word.zero(n)) == Word.zero(1n+n) : Word(1n+n)}:
394 match n:
395 case 0n:
396 {==}
397 case 1n+ +q:
398 AP.wcon_cong(1n+q, False{}, Word.shr.pad(q, Word.zero(q)), Word.zero(1n+q), AP.padz(q))