Set.size: def of Base
Import: import Base
Lines 3092-3093 of Base/base.bend: https://jend.leeeet.dev/read.txt?path=Base/base.bend&start_line=3092&end_line=3093

import Base

def Set.size(s: Set()) -> Nat:
  Map.size(&2, Unit, s)

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