[Bug c++/59244] New: [c++11] can't specialize template on ref-qualified member function pointer type

[eric.niebler at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59244

            Bug ID: 59244
           Summary: [c++11] can't specialize template on ref-qualified
                    member function pointer type
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: eric.niebler at gmail dot com

I believe the following should compile:

```
template<typename T>
struct U;

template<typename S, typename T>
struct U<S (T::*)()>
{};

template<typename S, typename T>
struct U<S (T::*)() &>
{};

template<typename S, typename T>
struct U<S (T::*)() &&>
{};
```

g++ 4.8.1 in C++11 mode gives this:

```
test.cpp:9:8: error: redefinition of ‘struct U<S (T::*)()>’
 struct U<S (T::*)() &>
        ^
test.cpp:5:8: error: previous definition of ‘struct U<S (T::*)()>’
 struct U<S (T::*)()>
        ^
test.cpp:13:8: error: redefinition of ‘struct U<S (T::*)()>’
 struct U<S (T::*)() &&>
        ^
test.cpp:5:8: error: previous definition of ‘struct U<S (T::*)()>’
 struct U<S (T::*)()>
        ^
```