On 11 February 2012 00:30, John Meacham <[email protected]> wrote:
> Would it be useful to make 'Proxy' an unboxed type itself? so
>
> Proxy :: forall k . k -> #
>
> This would statically ensure that no one accidentally passes ⊥ as a parameter
> or will get anything other than the unit 'Proxy' when trying to evaluate it.
> So the compiler can unconditionally elide the parameter at runtime. Pretty
> much exactly how State# gets dropped which has almost the same definition.
Or don't use an argument at all:
class Typeable t where
typeRep :: Tagged t TypeRep
newtype Tagged s b = Tagged { unTagged :: b }
See:
http://hackage.haskell.org/packages/archive/tagged/0.2.3.1/doc/html/Data-Tagged.html
Bas
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