Syntax extensions (was: RE: The Future of Haskell discussion
at the Haskell Workshop)
Malcolm Wallace
Malcolm.Wallace@cs.york.ac.uk
Wed, 10 Sep 2003 13:56:13 +0100
"Simon Marlow" <simonmar@microsoft.com> writes:
> Of course, if we change the language that is implied by -fglasgow-exts now,
> we risk breaking old code :-) Would folk prefer existing syntax extensions
> be moved into their own flags, or left in -fglasgow-exts for now? I'm
> thinking of:
>
> - implicit parameters
> - template haskell
> - FFI
> - rank-N polymorphism (forall keyword)
> - recursive 'do' (mdo keyword)
The obvious approach is to do both (in exactly the manner of
{-fffi, -farrows, -fwith}), namely to introduce a separate flag
for each extension, but (temporarily) retain -fglasgow-exts as
a catch-all for the complete set. Eventually, -fglasgow-exts
could disappear.
With this suggestion, I would certainly be in favour of separate
flags for existing extensions.
Regards,
Malcolm