File "w06.ml", line 16, characters 9-12:
16 | let () = foo 2
              ^^^
Warning 6 [labels-omitted]: label bar was omitted in the application of this
  function.

File "w06.ml", line 17, characters 9-12:
17 | let () = bar 4 2
              ^^^
Warning 6 [labels-omitted]: labels foo, baz were omitted in the application
  of this function.