2008-10-11 Hackage status with GHC 6.10

Duncan Coutts duncan.coutts at worc.ox.ac.uk
Wed Oct 15 13:58:06 EDT 2008

On Wed, 2008-10-15 at 09:46 +0100, Simon Peyton-Jones wrote:
> Right.  I've finally fixed 2497; it was a typo, and while I thought
> I'd tested it, the test didn't tet that RULES compile without any
> flags.

That's great, thanks.

> The story is that you should not need any funny RankN flags just to
> make RULES parse and typecheck. -XScopedTypeVariables gets set
> automatically inside a RULES pragma.  This is what the discussion on
> #2497 claimed, but there was a bug in the impl.

And for people trying to make their code compatible with older ghc too,
they can use this in their .cabal files:

extensions: ScopedTypeVariables

Which makes Cabal pass -XScopedTypeVariables for ghc-6.8 and for 6.6 and
earlier is passes -fglasgow-exts. This is what the bytestring package is
currently using (and no more ghc-options: -fglasgow-exts).


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