Set.add: def of Base
Import: import Base
Lines 3083-3084 of Base/base.bend: https://jend.leeeet.dev/read.txt?path=Base/base.bend&start_line=3083&end_line=3084

import Base

def Set.add(s: Set(), key: String) -> Set():
  Map.set(&2, Unit, s, key, Unit{})

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Map.set
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Set
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Unit