def sp.eta
import bend-osdev-cbc@0.1.0.0/PROOF.bend as PROOFimport Base
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
19def sp.eta(s: M.CmSplit) -> {M.CmSplit{M.cm.split.blocks(s), M.cm.split.tail(s)} == s : M.CmSplit}:
20 CoreL.split_eta(s)