Ketil Malde wrote:
wren ng thornton <w...@freegeek.org> writes:
A bit more seriously: is there any listing anywhere of which extensions
Hugs supports?
Cabal has a partial listing embedded in its code, though I can't seem
to find a textual version at the moment. In general, Hugs has all the
features of GHC 6.6: FFI, CPP, MPTCs, FunDeps,
OverlappingInstances,... I'm forgetting off-hand whether it has
Rank2Types/RankNTypes, but I think so.
Indeed Rank2Types are supported.
Of course, since it's GHC6.6-era that means it doesn't support
LANGUAGE pragma to enable these features.
I'm not entirely up to speed on Hugs nor Haskell 2010, but it seems that
it's fairly close to compliance?
Well here's the list of accepted proposals for 2010:
http://hackage.haskell.org/trac/haskell-prime/query?state=accepted&milestone=Haskell+2010
So far these ones are already implemented:
HierarchicalModules
FixityResolution
ForeignFunctionInterface
RelaxedDependencyAnalysis
Which leaves the following (seemingly simple) syntactic changes:
DoAndIfThenElse
LineCommentSyntax
NoNPlusKPatterns
And the following more significant changes:
EmptyDataDeclarations
PatternGuards
LanguagePragma
How significant these last three actually are would depend on the code
base. They shouldn't be too difficult I wouldn't think, but then I don't
know much about Hugs' code nor what sorts of implementation details the
extensions might run into.
--
Live well,
~wren
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