Perm.perm_refl: def of bend-mathlib@0.8.1.0
Import: import bend-mathlib@0.8.1.0/perm.bend as Perm
Lines 27-29 of bend-mathlib@0.8.1.0/perm.bend: https://jend.leeeet.dev/read.txt?path=bend-mathlib@0.8.1.0/perm.bend&start_line=27&end_line=29

import Base
import bendlib-kernel-list@1.0.0.0/list.bend as K

# Permutation is reflexive.
def perm_refl(-A: Data, -xs: List<&2, A>) -> K.perm(A, xs, xs):
  (Nil{}, {==})

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=bendlib-kernel-list@1.0.0.0/list.bend&name=perm