Re: ghc-6.4.20050220: panic! eval_data2tag...

[Christian Maeder]

This happens when partially recompiling with "-O" (I thing I've send a 
similar bug-report that was kept in the moderator's queue because it was 
to slightly too large - over 40K )

Christian
Thomas Hallgren wrote:
Hi,
I managed to distill my program into to the following small example that 
still exhibits the problem:

   module Bug where
   data S e = A | B | C | D | E | F | G | H | I deriving (Eq)
   newtype R = T (S R) deriving (Eq)
The output from 'ghc -c -O Bug.hs' is:
ghc-6.4.20050220: panic! (the `impossible' happened, GHC version 
6.4.20050220):
       eval_data2tag
   GHCziPrim.dataToTagzh{(w) v 95f}
     @ (Bug.S{tc r14v} <recnt>Bug.R{tc r14r})
     (__coerce (Bug.S{tc r14v} <recnt>Bug.R{tc r14r}) a{v s1Cm})

Please report it as a compiler bug to glasgow-haskell-bugs@haskell.org,
or http://sourceforge.net/projects/ghc/.
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