Yep, that works! Sweet!
On Tue, Jun 5, 2012 at 3:54 PM, Andres Löh
Hi Bryan.
Yes, I (and I assume Bas) want generalised newtype deriving to work, but it doesn't.
I want to write something very simple:
{-# LANGUAGE GeneralizedNewtypeDeriving #-} newtype Foo = Foo Int deriving (Eq, Show, Unbox)
But with the above, GHC says:
No instances for (M.MVector MVector Foo, G.Vector Vector Foo) arising from the 'deriving' clause of a data type declaration
Yes, because these are superclasses of Unbox. So can't you simply say this:
newtype Foo = Foo Int deriving (Eq, Show, Unbox, M.MVector MVector, G.Vector Vector)
?
Cheers, Andres
-- Andres Löh, Haskell Consultant Well-Typed LLP, http://www.well-typed.com
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