Check.spelled.seen: def of shake@0.7.0.0
Import: import shake@0.7.0.0/src/check.bend as Check
Lines 30-36 of shake@0.7.0.0/src/check.bend: https://jend.leeeet.dev/read.txt?path=shake@0.7.0.0/src/check.bend&start_line=30&end_line=36

import Base

# whether a spelling, when there is one, is among those already seen
def spelled.seen(sp: Maybe<&2, String>, +seen: List<&2, String>) -> Bool:
  match sp:
    case None{}:
      False{}
    case Some{ss}:
      List.contains(~String, ~String.eq, seen, ss)

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=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.contains
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  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