Maybe.maybe_default_map_sym: law of bend-mathlib@0.8.1.0
Import: import bend-mathlib@0.8.1.0/maybe.bend as Maybe
Lines 334-341 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=334&end_line=341

import Base

# The default of a map, with the mapped default, is the mapped default of the original, reversed to rewrite toward the simple side.
law maybe_default_map_sym:
  for ~A: Data
  for ~B: Data
  for ~f: A -> B
  for m: Maybe<&2, A>
  for -d: A
  {f(Maybe.default(&2, A, m, d)) == Maybe.default(&2, B, Maybe.map(&2, A, B, f, m), f(d)) : B}

Uses (5):
  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.default
  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_default_map