Andres Löh <andres at well-typed.com> writes: > Hi Bryan. > > 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) > Wonderful! I suppose that should have been clear from the error. Thanks! Cheers, - Ben