you can make things somewhat better with this construct
foo = do baz if cond then return bar else do bua bam
Except that this is invalid according to the Haskell report. In note 1 in section 9.3 (Layout), the report explicitly states that "A nested context must be further indented than the enclosing context". While hugs and ghc incorrectly accept your code, hbc and nhc98 get it right, i.e., they raise a parse error on it.
Wolfgang
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