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      Fix a long-standing egregious parser bug
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	*** MERGE TO STABLE ***

	*** NB: the important part of this commit
	***	got committed by accident with an
	***	unrelated message.  This commit
	***	should be from rev 1.50 to 1.52 of RdrHsSyn


GHC has parsed

	data T String = T String

without complaint, ever since day 1!  This led to consequential
incomprehensible messages.  The fix is easy.