ghc-6.4.20050220: panic! eval_data2tag...

[Simon Peyton-Jones]

Should be fixed now -- can you try with the HEAD?

Simon

| -----Original Message-----
| From: Christian Maeder [mailto:maeder at tzi.de]
| Sent: 23 February 2005 09:18
| To: Thomas Hallgren
| Cc: Simon Marlow; Simon Peyton-Jones; glasgow-haskell-bugs at haskell.org
| Subject: Re: ghc-6.4.20050220: panic! eval_data2tag...
| 
| 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 at haskell.org,
| > or http://sourceforge.net/projects/ghc/.
| >