def li.con_hd
import bend-osdev-mode-core@0.1.0.0/PROOF.bend as PROOFimport Base
import bend-osdev-mode-core@0.1.0.0/mode_core.bend as M
642def li.con_hd(+a: M.CmBlock, +s: List<&2, M.CmBlock>, +b: M.CmBlock, +t: List<&2, M.CmBlock>, +e: {Con{a, s} == Con{b, t} : List<&2, M.CmBlock>}) -> {a == b : M.CmBlock}:
643 %e : {a == cmp.head(b, _) : M.CmBlock}
644 {==}