13.exp

a = b
  where
    blah = blah

    -- hello
    -- bye
    hello = hello

a = b
  where
    blah = blah

    -- bye
    hello = hello

foo = x -- test
  where
    x = blah

foo = x
  where
    -- another test
    x = blah

f =
  case undefined of
    Just p
      -- If it's the potato.
      | zot -> undefined
      -- The geriatric concumbine.
      | otherwise -> hael