[project @ 2002-06-05 14:39:27 by simonpj]

[project @ 2002-06-05 14:39:27 by simonpj]
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	Add rebindable syntax for do-notation
		(this time, on the HEAD)
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Make do-notation use rebindable syntax, so that -fno-implicit-prelude
makes do-notation use whatever (>>=), (>>), return, fail are in scope,
rather than the Prelude versions.

On the way, combine HsDo and HsDoOut into one constructor in HsSyn,
and tidy up type checking of HsDo.