[Bug c++/66344] New: non-static data member initializer in class template fails to compile

["barry.revzin at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66344

            Bug ID: 66344
           Summary: non-static data member initializer in class template
                    fails to compile
           Product: gcc
           Version: 5.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: barry.revzin at gmail dot com
  Target Milestone: ---

The following code fails to compile on gcc 5.1:

#include <map>

template <typename T>
struct X {
    std::map<int, T>* storage = new std::map<int, T>;
};

int main() {
    X<int> x;
}

The compile output is listed at the end of this comment. If the type of storage
were instead std::vector<T>*, it would compile. If the type were set as a
typedef, as in:

    using U = std::map<int, T>;
    U* storage = new U;

That also compiles. All versions of this code compile on clang 3.6.0. 

main.cpp:5:51: error: expected ';' at end of member declaration
     std::map<int, T>* storage = new std::map<int, T>;
                                                   ^
main.cpp:5:51: error: declaration of 'std::map<int, T> X<T>::T'
main.cpp:3:11: error:  shadows template parm 'class T'
 template <typename T>
           ^
main.cpp:5:52: error: expected unqualified-id before '>' token
     std::map<int, T>* storage = new std::map<int, T>;
                                                    ^

main.cpp:5:46: error: wrong number of template arguments (1, should be at least
2)
     std::map<int, T>* storage = new std::map<int, T>;
                                              ^

In file included from /usr/local/include/c++/5.1.0/map:61:0,
                 from main.cpp:1:
/usr/local/include/c++/5.1.0/bits/stl_map.h:96:11: note: provided for
'template<class _Key, class _Tp, class _Compare, class _Alloc> class std::map'
     class map