[Bug c++/66934] New: Compiler accepting ill-formed program with extern variable declarations and using-declaration

[anders.granlund.0 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66934

            Bug ID: 66934
           Summary: Compiler accepting ill-formed program with extern
                    variable declarations and using-declaration
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: anders.granlund.0 at gmail dot com
  Target Milestone: ---

The following program is ill-formed since the two declarations in main are
conflicting.

  namespace N {
      extern int x;
  }

  int main() {
      using N::x;
      extern int x;
  }

GCC compiles with program without errors. The expected behaviour is to get a
compiler error.