[Bug c++/88736] New: nullptr_t available without namespace qualification

[drepper.fsp+rhbz at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88736

            Bug ID: 88736
           Summary: nullptr_t available without namespace qualification
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: drepper.fsp+rhbz at gmail dot com
  Target Milestone: ---

I don't think the following should work and clang indeed complains.  gcc 8.2.1
and current trunk both accept it without warning, even with -pedantic.

#include <cstddef>

int f(nullptr_t) {
  return 0;
}


Obviously gcc should recommend using std::nullptr_t.