String.internal_length_reverse_go: def of bend-mathlib@0.8.1.0
Import: import bend-mathlib@0.8.1.0/string.bend as String
Lines 354-360 of bend-mathlib@0.8.1.0/string.bend: https://jend.leeeet.dev/read.txt?path=bend-mathlib@0.8.1.0/string.bend&start_line=354&end_line=360

import Base
import bend-mathlib@0.8.1.0/nat.bend as MNat

def internal_length_reverse_go(s: String, -acc: String) -> {Nat.add(String.length(s), String.length(acc)) == String.length(String.reverse.go(s, acc)) : Nat}:
  match s:
    case SNil{}:
      {==}
    case SCon{h, +t}:
      %MNat.add_succ(String.length(t), String.length(acc)) : {_ == String.length(String.reverse.go(t, SCon{h, acc})) : Nat}
      internal_length_reverse_go(t, SCon{h, acc})

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.length
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.reverse.go
  https://jend.leeeet.dev/definition.txt?path=bend-mathlib@0.8.1.0/nat.bend&name=add_succ