#7204: Use a class to control FFI marshalling
---------------------------------+------------------------------------------
Reporter: simonpj | Owner:
Type: feature request | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.4.2
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: None/Unknown
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by simonpj):
You're right. And arguably `newtype deriving` should work with at
suitably-simple AT. Given
{{{
class C a where
type F a :: <kind>
newtype T a b c = MkT <reptype> deriving( C )
}}}
we should generate an instance looking like
{{{
instance C <reptype> => C (T a b c) where
F (T a b c) = F <reptype>
}}}
That's another new extension to the (already complex) `newtype deriving`,
but people will surely be asking for it before long!
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7204#comment:3>
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