g++-4.3 rejects the following code:

namespace n1 {
struct foo{};
}

namespace n2 {
struct foo{};
}

using namespace n1;
using namespace n2;

template <typename tp>
int run(tp const & t) {
    return t.foo;
}

struct bar {
    int foo;
};

int main() {
    bar b;

    run(b);
}

the error message is:
bug.cpp: In function ‘int run(const tp&)’:
bug.cpp:14: error: reference to ‘foo’ is ambiguous
bug.cpp:6: error: candidates are: struct n2::foo
bug.cpp:2: error:                 struct n1::foo

g++-4.1 and g++-4.2 accept the code, though ...


-- 
           Summary: g++ rejects valid code
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tim at klingt dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35138