>
> In GHC 5.02 on Sun Solaris (binary package), running 'ghc-5.02 -c
> -fglasgow-exts Test.hs' and Test.hs containing the following code:
> > module Test where
> > bimapGRose __ff __a = ((to ((bimapEP epGRose) epGRose))
> > ((bimapGRose__ __ff) __a))
>
> Gives the following panic message:
> | ghc-5.02: panic! (the `impossible' happened, GHC version 5.02):
> | parser/Parser.hs:5394: Non-exhaustive patterns in case
> |
> | Please report it as a compiler bug to
> [EMAIL PROTECTED],
> | or http://sourceforge.net/projects/ghc/.
>
> The problem does not occur when '-fglasgow-exts' is omitted,
> but we need
> the universally quantified types...
Thanks for the report. When -fglasgow-exts is on, there are a bunch of
extra reserved keywords that all begin with two underscores, eg. '__a'.
These keywords are used in interface files.
The fact that the keyword triggered a panic rather than a parse error is
really a bug in Happy, which I'll look into fixing, and we'll also be
sure to add a note in the documentation about the extra reserved words.
Cheers,
Simon
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