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From: "momchil.velikov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/60994] New: gcc does not recognize hidden/shadowed enumeration as valid nested-name-specifier
Date: Tue, 29 Apr 2014 07:00:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60994

            Bug ID: 60994
           Summary: gcc does not recognize hidden/shadowed enumeration as
                    valid nested-name-specifier
           Product: gcc
           Version: 4.10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: momchil.velikov at gmail dot com

gcc version 4.10.0 20140428 (experimental) (GCC)

Compiling (with c++ -c -std=c++11 b.cc) the following program

enum struct A
{
  n = 3
};

int
foo()
{
  int A;
  return A::n;
}

results in the error:

b.cc: In function 'int foo()':
b.cc:10:10: error: 'A' is not a class, namespace, or enumeration
   return A::n;
          ^
According to the C++11 Standard, [basic.lookup.qual] #1

"If a :: scope resolution operator in a nested-name-specifier is not preceded
by a decltype-specifier, lookup of the name preceding that :: considers only
namespaces, types, and templates whose specializations are types."

GCC ought not to resolve "A" to the local variable, but to the enumeration
type. This is very similar to the example in the standard 

struct A
{
  static int n;
};

int
foo()
{
  int A;
  return A::n;
}


which is compiled correctly by GCC, though.