[PATCH] Fix PR c++/60994 gcc does not recognize hidden/shadowed enumeration as valid nested-name-specifier

[Momchil Velikov <momchil dot velikov at gmail dot com>]

Hello,

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.


Please, review this proposed fix. Bootstrapped/regtested for C/C++ on
x86_64-unknown-linux-gnu.

~chill

Attachment: scoped-enum-nested-name-specifier.diff
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