List.map_id: law of bend-mathlib@0.8.1.0
Import: import bend-mathlib@0.8.1.0/list.bend as List
Lines 1288-1292 of bend-mathlib@0.8.1.0/list.bend: https://jend.leeeet.dev/read.txt?path=bend-mathlib@0.8.1.0/list.bend&start_line=1288&end_line=1292

import Base

# Mapping the identity gives the list back.
law map_id:
  for ~A: Type
  for xs: List<A>
  {List.map(~A, ~A, ~(x => x), xs) == xs : List<A>}

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.map