On Tue, Jan 29, 2002 at 07:36:56AM -0800, Simon Peyton-Jones wrote: > The Haskell Report says of n+k patterns: > > "A n+k pattern can only be matched against a value in > the class Integral." > > This seems far too strong. All that is needed are Ord (for the >=) > and Num (for - and fromInteger), and indeed that's what GHC requires. > Do Hugs or nhc actually require Integral?

Hugs demands Integral and the assumption that only one class is involved seems deeply entwined in the code. > In any case, I propose to change "Integral" to "Ord and Num". Without this change, the relevant rule of the formal semantics of patterns wouldn't preserve the static semantics. _______________________________________________ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell