[GHC] #1680: Attempting to do foreign import with unboxed tuple return type causes GHC panic

[GHC]

#1680: Attempting to do foreign import with unboxed tuple return type causes GHC
panic
-----------------------------+----------------------------------------------
  Reporter:  sorear          |          Owner:       
      Type:  bug             |         Status:  new  
  Priority:  normal          |      Milestone:       
 Component:  Compiler (FFI)  |        Version:  6.7  
  Severity:  normal          |       Keywords:       
Difficulty:  Unknown         |             Os:  Linux
  Testcase:                  |   Architecture:  x86  
-----------------------------+----------------------------------------------
{{{
 stefan at stefans:/tmp$ ghc -ddump-asm -fglasgow-exts X.hs
 ghc-6.7.20070829: panic! (the 'impossible' happened)
   (GHC version 6.7.20070829 for i386-unknown-linux):
 resultWrapper
     (# base:GHC.Prim.Int#{(w) tc 3G},
        base:GHC.Prim.Int#{(w) tc 3G},
        base:GHC.Prim.Int#{(w) tc 3G} #)

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

 stefan at stefans:/tmp$ cat X.hs
 module X where
 import GHC.Exts
 foreign import ccall unsafe "foo" foo :: Int# -> Int# -> Int# -> (# Int# ,
 Int# , Int# #)
 stefan at stefans:/tmp$
 }}}

 6.6.1 and 6.4.2 are also affected.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1680>
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