class D a b where fd :: a -> b -> ()
d1 x = let p = fd x in () d2 x = let p y = fd x y in ()
GHC derives the following types:
d1 :: D a b => a -> () d2 :: a -> ()
Hugs rejects d1 on the grounds that the type is ambiguous, but agrees on the type of d2. I do not understand where the context disappears to in this example - in particular, when I compare with the single parameter case:
class C a where fc :: a -> a -> ()
c1 x = let p = fc x in () c2 x = let p y = fc x y in ()
where
c1 :: C a => a -> () c2 :: C a => a -> ()
is inferred, as I would expect.
-- Andreas Rossberg, [EMAIL PROTECTED]
Let's get rid of those possible thingies! -- TB
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