Bad warning when exporting data families

module Foo ( T ) where
data family T a

module Bar ( T(..), module Foo ) where
import Foo
data instance T Int = TInt

GHC issues the following warning:

Bar.hs:1:20: Warning: `T' is exported by `module Foo' and `T(..)'

However, that's the only way to export both module Foo and TInt from Bar. I don't think GHC should warn here.

Trac metadata

Trac field	Value
Version	6.9
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
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Operating system	Unknown
Architecture	Unknown