[project @ 1999-12-01 10:22:53 by sewardj]

[project @ 1999-12-01 10:22:53 by sewardj]
Fix bug in 'deriving Enum' reported by Ralf Hinze:
   data T = A | B deriving Enum
failed, requiring instance Ord T, because code generated
for enumFromThen required Ord.  We now derive just fromEnum
and toEnum, and let the Report's defaults do the rest.