[project @ 2004-12-22 16:58:34 by simonpj]

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	     Add more scoped type variables
	----------------------------------------

Now the top-level forall'd variables of a type signature scope
over the right hand side of that function.

	f :: a -> a
	f x = ....

The type variable 'a' is in scope in the RHS, and in f's patterns.

It's implied by -fglasgow-exts, but can also be switched off independently
using -fscoped-type-variables (and the -fno variant)