Maybe.maybe_map_compose_sym: law of bend-mathlib@0.8.1.0
Import: import bend-mathlib@0.8.1.0/maybe.bend as Maybe
Lines 269-277 of bend-mathlib@0.8.1.0/maybe.bend: https://jend.leeeet.dev/read.txt?path=bend-mathlib@0.8.1.0/maybe.bend&start_line=269&end_line=277

import Base

# Mapping a composition maps the composition, reversed to rewrite toward the simple side.
law maybe_map_compose_sym:
  for ~A: Data
  for ~B: Data
  for ~C: Data
  for -f: A -> B
  for -g: B -> C
  for m: Maybe<&2, A>
  {Maybe.map(&2, A, C, x => g(f(x)), m) == Maybe.map(&2, B, C, g, Maybe.map(&2, A, B, f, m)) : Maybe<&2, C>}

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.sym
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe.map
  https://jend.leeeet.dev/definition.txt?path=bend-mathlib@0.8.1.0/maybe.bend&name=maybe_map_compose