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From: "mbos at google dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/60927] Ambiguity not caught when name introduced through using-directive conflicts with previously declared entity
Date: Tue, 22 Apr 2014 22:27:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60927

Maurice Bos <mbos at google dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mbos at google dot com

--- Comment #1 from Maurice Bos <mbos at google dot com> ---
Some interesting related test cases:

namespace N { struct A {}; }
namespace A {}
using namespace N;
A * x;
int main() {}

G++ correctly complains about ambiguity. When the two lines with 'N' are
removed, it complains that A is not a type. (As expected.)

Very similar test case:

#include <memory>
namespace N { struct A {}; }
namespace A {}
using namespace N;
std::unique_ptr<A> x; // Only this line is different.
int main() {}

G++ does not complain about ambiguity, but gives the same error as when the two
lines with 'N' are removed.