[GHC] #844: panic on conflicting patterns in TH splice

[GHC]

#844: panic on conflicting patterns in TH splice
-------------------------------+--------------------------------------------
  Reporter:  guest             |          Owner:         
      Type:  bug               |         Status:  new    
  Priority:  normal            |      Milestone:         
 Component:  Template Haskell  |        Version:  6.4.2  
  Severity:  minor             |     Resolution:         
  Keywords:                    |             Os:  Unknown
Difficulty:  Unknown           |   Architecture:  Unknown
-------------------------------+--------------------------------------------
Comment (by guest):

 {{{
 foo = sequence
   [
     funD (mkName "f")
       [
         clause
           [varP $ mkName "c",varP $ mkName "c"]
           (normalB $ [| undefined |])
           []
       ]
   ]
 }}}, the compiler panics:

 ghc-6.4.2: panic! (the `impossible' happened, GHC version 6.4.2):
         SrcLoc.srcSpanStartLine

 . It would be nice if ghc gave an error message just like the non-TH case.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/844>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler