[Bug c++/67074] New: Name lookup ambiguity between namespace and its alias

[anders.granlund.0 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67074

            Bug ID: 67074
           Summary: Name lookup ambiguity between namespace and its alias
           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: ---

Test case:

  namespace P{ namespace X { static int i = 1; } }
  namespace Q { namespace X = P::X; }
  using namespace P;
  using namespace Q;
  int main() { X::i; }

Command line:

  g++ prog.cc -std=c++14 -pedantic-errors

This results in name-lookup ambiguity errors when looking up X in main. This is
not a name-lookup ambiguity since the two names founds denotes the same entity.

I tried this with gcc HEAD 6.0.0 20150730 here:

  http://melpon.org/wandbox/permlink/6IBZhBmgDMkq6Eho