#7512: GHC crashes with multiple => in instance
---------------------------------+------------------------------------------
Reporter: jvictor | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Compiler | Version: 7.6.1
Resolution: worksforme | Keywords:
Os: Linux | Architecture: x86_64 (amd64)
Failure: Compile-time crash | Difficulty: Unknown
Testcase: | Blockedby:
Blocking: | Related:
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Changes (by simonpj):
* status: new => closed
* difficulty: => Unknown
* resolution: => worksforme
Comment:
Really? With 7.6.1 I get
{{{
bash$ c:/fp/ghc-7.6.1/bin/ghc -c T7512.hs
T7512.hs:7:10:
Malformed instance: IArray UArray r => Num r => Num (Vector r)
}}}
GHC 7.4.1 indeed crashes with
{{{
bash-3.1$ c:/fp/ghc-7.4.1/bin/ghc -c T7512.hs
ghc.exe: panic! (the 'impossible' happened)
(GHC version 7.4.1 for i386-unknown-mingw32):
compiler\rename\RnSource.lhs:429:14-81: Irrefutable pattern failed
for pattern Data.Maybe.Just (inst_tyvars,
_,
SrcLoc.L _ cls,
_)
}}}
So I'll close this as already fixed. Re-open if you disagree.
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7512#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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