#5513: panic! (the 'impossible' happened) on ‘deriving instance lowercase_name
a’
---------------------------------+------------------------------------------
Reporter: andersk | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.3 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Compile-time crash
---------------------------------+------------------------------------------
This bogus code:
{{{
{-# LANGUAGE StandaloneDeriving #-}
deriving instance lowercase_name a
}}}
causes current GHC HEAD to panic:
{{{
ghc: panic! (the 'impossible' happened)
(GHC version 7.3.20110927 for x86_64-unknown-linux):
nameModule lowercase_name{tv aar}
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
}}}
I also tested GHC 7.0.3, which correctly diagnosed the problem:
{{{
crash.hs:2:19: Malformed instance header: lowercase_name a
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5513>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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