#5012: haskell 98 program does not typecheck when compiled with -XTypeFamilies
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Reporter: jcpetruzza | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Compiler (Type checker) | Version: 7.0.2
Resolution: invalid | Keywords:
Testcase: | Blockedby:
Difficulty: | Os: Unknown/Multiple
Blocking: | Architecture: Unknown/Multiple
Failure: GHC rejects valid program |
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Comment(by jcpetruzza):
Thanks for the quick feedback!
Incidentally, I did check the docs before opening this ticket. I didn't
read it in detail but a fast scan of section 7.7 (Type families) didn't
reveal any gotchas of this sort. I didn't find anything also on the wiki
article linked from there. A short cautionary note regarding let-
generalization (and any other implied extension) when using Type Families
might be a good idea!
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5012#comment:3>
GHC <http://www.haskell.org/ghc/>
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