foo =
  bar
  ++
    -- some comment
    case foo of
      a -> a

foo =
  bar
    ++ -- some comment
    case foo of
      a -> a

foo =
  bar
    ++ case foo of -- some comment
      a -> a

 some comment
 some comment
 some comment
foo =
  bar
  ++
    case foo of
      a -> a

foo =
  bar
    case foo of
      a -> a

foo =
  bar
      a -> a
