Qualified name in binding position

When building diagrams with HEAD I ran into this difference from 7.0.2 (and I believe 7.2) shown with this:

---- Qual.hs --------

{-# LANGUAGE TypeFamilies #-}

import qualified Blah.A as A

instance A.B Int where
  type A.T Int = Bool

---- Blah/A.hs --------

{-# LANGUAGE TypeFamilies #-}

module Blah.A (B(..)) where

class B a where
  type T a :: *

--- Output from HEAD (was same with 7.3.20111206)
$ ~/ghc/inplace/bin/ghc-stage2 --interactive Qual.hs
GHCi, version 7.5.20111215: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
[1 of 2] Compiling Blah.A           ( Blah/A.hs, interpreted )
[2 of 2] Compiling Main             ( Qual.hs, interpreted )

Qual.hs:6:8: Qualified name in binding position: A.T
Failed, modules loaded: Blah.A.
*Blah.A>

---- Output from 7.0.2
$ ghci Qual.hs
GHCi, version 7.0.2: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
[1 of 2] Compiling Blah.A           ( Blah/A.hs, interpreted )
[2 of 2] Compiling Main             ( qual.hs, interpreted )
Ok, modules loaded: Blah.A, Main.
*Main>

In our case we didn't need the qualified import anyway and removed it here: http://www.patch-tag.com/r/byorgey/diagrams-core/snapshot/hash/20111215185451-1e371-dcaeff70fc825e9afa91addbeaaa69c5749f5529/patch

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Trac field	Value
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Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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