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