#7093: Exception when encountering instance declarations without class name
--------------------------------+-------------------------------------------
Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler (Parser)
Version: 7.4.1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: Compile-time crash | Testcase:
Blockedby: | Blocking:
Related: |
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'''Code'''
{{{
instance Bounded b => (a -> b) where
minBound = const minBound
maxBound = const maxBound
}}}
GHC 7.4.1 "crashes" with an exception if the class name
is missing.
{{{
*** Exception: compiler/rename/RnSource.lhs:429:14-81: Irrefutable pattern
failed for pattern Data.Maybe.Just (inst_tyvars,
_,
SrcLoc.L _ cls,
_)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7093>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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