law append_cancel_l

lawful-arrays@0.1.0.0 · proof_base.bend:501

import Base

501# ...and so are the second parts.
502law append_cancel_l:
503  for -A: Data
504  for +xs: List<&2, A>
505  for -y1: List<&2, A>
506  for -y2: List<&2, A>
507  for e: {List.append(&2, A, xs, y1) == List.append(&2, A, xs, y2) : List<&2, A>}
508  {y1 == y2 : List<&2, A>}