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Simon Peyton Jones authored
The main purpose of this patch is to fix Trac #3306, by fleshing out the syntax for GADT-style record declraations so that you have a context in the type. The new form is data T a where MkT :: forall a. Eq a => { x,y :: !a } -> T a See discussion on the Trac ticket. The old form is still allowed, but give a deprecation warning. When we remove the old form we'll also get rid of the one reduce/reduce error in the grammar. Hurrah! While I was at it, I failed as usual to resist the temptation to do lots of refactoring. The parsing of data/type declarations is now much simpler and more uniform. Less code, less chance of errors, and more functionality. Took longer than I planned, though. ConDecl has record syntax, but it was not being used consistently, so I pushed that through the compiler.
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