[Bug c++/67016] New: Redeclaration of enum

[anders.granlund.0 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67016

            Bug ID: 67016
           Summary: Redeclaration of enum
           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: ---

Consider the following program:

  enum E {};
  enum E;
  int main() {}

Compile it with the following command line:

  g++ prog.cc -std=c++98 -pedantic-errors

No error messages are given. I expect to get at least one error message, since
the program is ill-formed according to the c++ standard, see [dcl.type.elab]/1:

  http://eel.is/c++draft/dcl.dcl#dcl.type.elab-1

I have tried compiling with gcc HEAD 6.0.0 20150725 here:

  http://melpon.org/wandbox/permlink/KtDN7vjZN3bc1gtc