List.contains: def of Base
Import: import Base
Lines 1131-1138 of Base/base.bend: https://jend.leeeet.dev/read.txt?path=Base/base.bend&start_line=1131&end_line=1138

import Base

def List.contains(
  ~A: Data, ~eq: A -> A -> Bool, xs: List<&2, A>, +x: A
) -> Bool:
  match xs:
    case Nil{}:
      False{}
    case h <> t:
      List.any.if(u => List.contains(~A, ~eq, t, x), eq(h, x))

Uses (3):
  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.any.if