#7358: ghc: panic! (The 'impossible' happened) from RnSource.lhs
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Reporter: jeffshaw | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.4.2 | Keywords:
Os: Linux | Architecture: x86_64 (amd64)
Failure: Compile-time crash | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by jeffshaw):
ghc: panic! (the 'impossible' happened)
(GHC version 7.4.2 for x86_64-unknown-linux):
compiler/rename/RnSource.lhs:430:14-81: Irrefutable pattern failed
for pattern Data.Maybe.Just (inst_tyvars,
_,
SrcLoc.L _ cls,
_)
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Here is the source code that creates this error:
instance A a => B a => C a where
c = a
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7358#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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