Pkg.seen.has: def of ezx@1.13.0.0
Import: import ezx@1.13.0.0/src/pkg/pkg.bend as Pkg
Lines 496-504 of ezx@1.13.0.0/src/pkg/pkg.bend: https://jend.leeeet.dev/read.txt?path=ezx@1.13.0.0/src/pkg/pkg.bend&start_line=496&end_line=504

import Base

# whether a name is already among the ones the walk has reached. Base's
# `List.contains` applies an erased equality, which falls outside the
# termination check; this scan is structural.
def seen.has(xs: List<&2, String>, +want: String) -> Bool:
  match xs:
    case []:
      False{}
    case +h <> t:
      seen.has.step(String.eq(h, want), _u => seen.has(t, want))

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.eq
  https://jend.leeeet.dev/definition.txt?path=ezx@1.13.0.0/src/pkg/pkg.bend&name=seen.has.step