$my-map: (
  'foo': 1, // Comment
  'bar': 2, // Comment
);

$my-map: (
  "foo": 1,
  // Comment
    "bar": 2,
  //        ^ <----- trailingComma should not printed
  // Comment
);

$my-map: (
  "foo": 1,
  // Comment
    "bar": 2
  // Comment
);