Format.differ: def of bend-lint-rules@0.2.0.0
Import: import bend-lint-rules@0.2.0.0/layout/format.bend as Format
Lines 2341-2349 of bend-lint-rules@0.2.0.0/layout/format.bend: https://jend.leeeet.dev/read.txt?path=bend-lint-rules@0.2.0.0/layout/format.bend&start_line=2341&end_line=2349

import Base

# Where `a` and `b` first differ: `same` is whether the characters before `at` were the same.
def differ(a: String, b: String, at: U32, same: Bool) -> U32:
  match a b same:
    case _ _ False{}:
      (at - 1: U32)
    case SCon{x, xs} SCon{y, ys} True{}:
      differ(xs, ys, (at + 1: U32), Char.is_eq(x, y))
    case _ _ True{}:
      at

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Char.is_eq
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.sub