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@xxxxxxxxxxx,
or http://sourceforge.net/projects/ghc/.
| 