[Haskell-cafe] Re: The state of Hugs

Ketil Malde wrote:

wren ng thornton writes:

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A bit more seriously: is there any listing anywhere of which extensions Hugs supports?

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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.

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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