[GHC] #3395: Template Haskell crashes

[GHC]

#3395: Template Haskell crashes
---------------------------------+------------------------------------------
    Reporter:  NeilMitchell      |        Owner:                  
        Type:  bug               |       Status:  closed          
    Priority:  normal            |    Milestone:                  
   Component:  Compiler          |      Version:  6.10.4          
    Severity:  normal            |   Resolution:  fixed           
    Keywords:                    |   Difficulty:  Unknown         
    Testcase:                    |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |  
---------------------------------+------------------------------------------
Changes (by igloo):

  * status:  new => closed
  * difficulty:  => Unknown
  * resolution:  => fixed

Comment:

 Thanks for the report.

 This represents
 {{{
 [r1 <- undefined | undefined]
 }}}
 i.e. it generates incorrect Haskell.

 The HEAD gives a
 {{{
 ghc-stage2: panic! (the 'impossible' happened)
   (GHC version 6.11.20090722 for x86_64-unknown-linux):
         Malformed body
 }}}
 error.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3395#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler