#7156: "Pattern match on GADT" error for non-GADT
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Reporter: ryani | Owner:
Type: bug | Status:
new
Priority: normal | Milestone:
Component: Compiler (Type checker) | Version:
7.0.4
Keywords: GADTs, TypeFamilies, ExistentialQuantification | Os:
Unknown/Multiple
Architecture: Unknown/Multiple | Failure:
None/Unknown
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by ryani):
I propose "f should typecheck successfully". Even more concretely, I
propose that the TypeFamilies extension (which enables equality
constraints, correct?) should enable pattern matching on types that
otherwise appear to be GADTs.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7156#comment:6>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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