def sp.mask_blk
import bend-osdev-cbc@0.1.0.0/PROOF.bend as PROOFimport Base
import bend-osdev-bytes@0.1.1.0/bytes.bend as B
import bend-osdev-mode-core@0.1.0.0/mode_core.bend as M
import bend-osdev-mode-core@0.1.0.0/LAWS.bend as CoreL
25def sp.mask_blk(b: M.CmBlock, rest: List<&2, U32>) -> {B.mask(M.cm.bytes_onto(b, rest)) == M.cm.bytes_onto(b, B.mask(rest)) : List<&2, U32>}:
26 CoreL.mask_bytes_onto(b, rest)