Comment 2 for bug 321883

I thought this was filed before but I cannot find it.
Testcase:
namespace std
{
  namespace __gnu_debug {
namespace debug = std::__gnu_debug;
namespace debug
{
-----
Error we get:
t.ii:6: error: namespace alias ‘std::__gnu_debug::debug’ not allowed here, assuming ‘std::__gnu_debug’
t.ii:6: internal compiler error: in resume_scope, at cp/name-lookup.c:1372
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.