[Bug c++/56285] New: [C++11] Arguments to an inheriting constructor is not forwarded properly

["lucdanton at free dot fr" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56285

             Bug #: 56285
           Summary: [C++11] Arguments to an inheriting constructor is not
                    forwarded properly
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: lucdanton@free.fr


Created attachment 29417
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29417
Minimal reproducible testcase

$ g++-snapshot --version
g++-snapshot (Debian 20130209-1) 4.8.0 20130209 (experimental) [trunk revision
195917]

$ cat main.cpp 
struct foo {
    explicit foo(int&&) {}
};

struct bar: private foo {
    using foo::foo;
};

int main()
{
    bar b { 42 };
}

$ g++-snapshot -Wall -std=c++11 main.cpp 
main.cpp: In constructor 'bar::bar(int&&)':
main.cpp:6:16: error: cannot bind 'int' lvalue to 'int&&'
     using foo::foo;
                ^
main.cpp:2:14: error:   initializing argument 1 of 'foo::foo(int&&)'
     explicit foo(int&&) {}
              ^
main.cpp: In function 'int main()':
main.cpp:11:16: note: synthesized method 'bar::bar(int&&)' first required here 
     bar b { 42 };