[Bug c++/86249] New: declaration conflicts with target of using declaration already in scope

[zhonghao at pku dot org.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86249

            Bug ID: 86249
           Summary: declaration conflicts with target of using declaration
                    already in scope
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhonghao at pku dot org.cn
  Target Milestone: ---

The code is as follow:

namespace Name {
 template <class T> class Point;
}

using Name::Point;

template <class T> class Point {
 public:
 Point() {}
 protected:
 T member;
};

int main(void) {
 Name::Point<double> d;
 return(0);
}


clang++ rejects the code with error messages:
error: declaration conflicts with target of using declaration already in scope
    template <class T> class Point {
error: implicit instantiation of undefined template 'Name::Point<double>'
     Name::Point<double> d;

g++ accepts the code. The code comes from a gcc bug report:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=1876

I thought that it is a clang++ bug, and reported it to
https://bugs.llvm.org/show_bug.cgi?id=37867

Richard Smith determined that this is a gcc bug. Shall gcc repair the bug, if
it is?