http://llvm.org/bugs/show_bug.cgi?id=12583

Petr Ovtchenkov <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|                            |INVALID

--- Comment #8 from Petr Ovtchenkov <[email protected]> 2012-04-18 
04:04:13 CDT ---
Summary:

Not a bug, because during evaluating

    template <class T>
    static decltype( declval<typename T::pointer>(), declval<true_type>())
__test_p( int );

compiler check possible (not available here, but still possible) comma operator

  operator ,( x_pair<int, Incomplete>*, true_type )

Checking this operator assume instantiation of x_pair<int, Incomplete> due to
ADL (similar to 

  S<incomplete> *p; // not instantiated here
  int k = f(p);     // instantiated here

instantiation of S<incomplete> due to ADL for f(p)).

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