Error found:
at tests/purs/failing/4483.purs:10:1 - 11:24 (line 10, column 1 - line 11, column 24)

  The following type class members have not been implemented:
  bar :: Int -> Int

in type class instance
              
  Main.Foo Int
              

See https://github.com/purescript/documentation/blob/master/errors/MissingClassMember.md for more information,
or to contribute content related to this error.