Cannot derive instances for empty datatypes defined in other modules

In file A.hs:

module A where

data Empty

In file B.hs:

{-# LANGUAGE StandaloneDeriving #-}

module B where

import A

deriving instance Show Empty

GHC 7.5.20120421 reports:

    Can't make a derived instance of `Show Empty':
      The data constructors of `Empty' are not all in scope
        so you cannot derive an instance for it
    In the stand-alone deriving instance for `Show Empty'

But Empty has no constructors, and the problem does not arise if Empty is declared in B.

I guess the problem is in this part of the code of TcDeriv:

      	   ; let hidden_data_cons = not (isWiredInName (tyConName rep_tc)) &&
                                    (isAbstractTyCon rep_tc || 
                                     any not_in_scope (tyConDataCons rep_tc))
      	         not_in_scope dc  = null (lookupGRE_Name rdr_env (dataConName dc))
      	   ; unless (isNothing mtheta || not hidden_data_cons)
      	   	    (bale_out (derivingHiddenErr tycon))

Trac metadata

Trac field	Value
Version	7.5
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture