Router.overlap: def of bend-kit-router@0.2.0.0
Import: import bend-kit-router@0.2.0.0/router.bend as Router
Lines 422-435 of bend-kit-router@0.2.0.0/router.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-router@0.2.0.0/router.bend&start_line=422&end_line=435

import Base

def overlap(a: List<&2, Segment>, b: List<&2, Segment>) -> Bool:
  match a b:
    case Nil{} Nil{}:
      True{}
    case Literal{x} <> at Literal{y} <> bt:
      continue(String.eq(x, y), u => overlap(at, bt))
    case Literal{x} <> at Parameter{y} <> bt:
      continue(Bool.not(String.is_empty(x)), u => overlap(at, bt))
    case Parameter{x} <> at Literal{y} <> bt:
      continue(Bool.not(String.is_empty(y)), u => overlap(at, bt))
    case Parameter{x} <> at Parameter{y} <> bt:
      overlap(at, bt)
    case _ _:
      False{}

Uses (7):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.not
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.eq
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.is_empty
  https://jend.leeeet.dev/definition.txt?path=bend-kit-router@0.2.0.0/router.bend&name=Segment
  https://jend.leeeet.dev/definition.txt?path=bend-kit-router@0.2.0.0/router.bend&name=continue