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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/55232] [C++11] Compilation fails if expanding function param pack in initializer_list
Date: Wed, 07 Nov 2012 13:52:00 -0000
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X-Bugzilla-Keywords: ice-on-valid-code
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55232

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-valid-code
             Status|RESOLVED                    |NEW
   Last reconfirmed|                            |2012-11-07
      Known to work|4.7.2, 4.8.0                |
         Resolution|WORKSFORME                  |
            Summary|[C++0x] Compilation fails   |[C++11] Compilation fails
                   |if expanding function param |if expanding function param
                   |pack in initializer_list    |pack in initializer_list
     Ever Confirmed|0                           |1

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-11-07 13:52:34 UTC ---
It only fails with warnings enabled.

Reduced:

struct vector
{
    typedef double value_type;

    int push_back() { return 0; }
};

template< class... T >
struct X : T...
{
    void push_back( typename T::value_type ... vals )
    {
        int li[] = { T::push_back()... };  //Fail
    }
};

int main()
{
    X< vector > x;
    x.push_back(2);
    return 0;
}