[GHC] #3782: Data Parallel "Impossible happened" compiler error

[GHC]

#3782: Data Parallel "Impossible happened" compiler error
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    Reporter:  guest                  |        Owner:  benl        
        Type:  bug                    |       Status:  new         
    Priority:  high                   |    Milestone:  7.0.1       
   Component:  Data Parallel Haskell  |      Version:  6.12.1      
    Keywords:                         |     Testcase:              
   Blockedby:                         |   Difficulty:              
          Os:  Unknown/Multiple       |     Blocking:              
Architecture:  Unknown/Multiple       |      Failure:  None/Unknown
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Comment(by benl):

 Beautified by

 {{{
 Thu Oct 28 23:33:20 PDT 2010  benl at ouroborus.net
 * Nicer error message for #3782
  It now says:

  ghc-stage2: sorry! (this is work in progress)
    (GHC version 7.1.20101028 for i386-apple-darwin):
         Vectorise.Builtins.indexBuiltin

      DPH builtin function 'sumTyCon' of size '11' is not yet implemented.
      This function does not appear in your source program, but it is
 needed
      to compile your code in the backend. This is a known, current
 limitation
      of DPH. If you want it to to work you should send mail to cvs-
 ghc at haskell.org
      and ask what you can do to help (it might involve some GHC hacking).


  I added 'pprSorry' that behaves like 'pprPanic' except it say sorry!
 instead
  of panic!, and doesn't ask the user to report a bug.
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3782#comment:10>
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