ghc -O

[Simon Peyton-Jones]

OK, I've committed the fix to this.  It's a long-standing bug
that I can't think how I managed to put in in the first place,
but it was tickled into life by the newtype with a forall inside it.

You can check out a new compiler (head or branch) or 
wait for 5.02.  Meanwhile, a workaround is to use a data type
instead of a newtype.

Thanks for the report

Simon

| -----Original Message-----
| From: Koen Claessen [mailto:koen at safelogic.se] 
| Sent: 31 October 2001 16:31
| To: Simon Marlow
| Cc: glasgow-haskell-bugs at haskell.org
| Subject: ghc -O
| 
| 
| Simon Marlow wrote:
| 
|  | Thanks, I've fixed both of these.
| 
| Great!
| 
| Now I have discovered another bug in GHC. It happens very
| often that I get a "the impossible happened" when I run GHC 
| with the -O flag.
| 
| Here is an example. I attached two files. When running "ghc
| -o --make FormParse.hs", I get the impossible error.
| 
| /Koen.
|