Description Nathan Ridge 2016-10-12 12:15:50 EDT

The following code:


template <typename T>
int foo(T t)
{
    return bar(t);
}

namespace N
{
    class A {};
    int bar(N::A);  // WARNING: Unused declaration of function 'bar'
}

int main()
{
    foo(N::A());
}


produces a warning at the indicated location. This warning is a false positive, as the code does use bar(). bar() found by argument-dependent lookup during the instantiation of foo() with T = N::A.