template<uint32_t pin>
class Pin
{
public:
    void Test()
    {
        if(pin < 16) {
1:            g_test &= ~(0x03UL << (pin * 2));
        }
        else
        {
            g_test &= ~(0x03UL << ((pin - 16) * 2));
        }
    }
};

int main()
{
    Pin<22> test;
    test.Test();
}

source/main.cpp: In member function 'void Pin<pin>::Test() [with long unsigned int pin = 22ul]':
source/main.cpp:30:12:   instantiated from here
source/main.cpp:18:4: warning: left shift count >= width of type [enabled by default]