#include <set>

using namespace std;

struct A {};

struct X
{
    template <typename T> void set(T x) {}
};

struct Y : X {};

void f()
{
    Y y;
    A a;
    y.set<A>(a);
}

/*

$ clang++ -Wall -std=c++98 -c test.cpp
test.cpp:19:4: warning: lookup of 'set' in member access expression is ambiguous; using member of 'Y' [-Wambiguous-member-template]
        y.set<A>(a);
          ^
test.cpp:10:29: note: lookup in the object type 'Y' refers here
        template <typename T> void set(T x) {}
                                   ^
In file included from test.cpp:2:
In file included from /usr/include/c++/4.4/set:60:
/usr/include/c++/4.4/bits/stl_set.h:87:11: note: lookup from the current scope refers here
    class set
          ^
1 warning generated.


*/