From: http://forum.dlang.org/post/zxhvyfitqkbvmfseyqxr@forum.dlang.org

struct Fail1
{
    void opDispatch(string s)()
    {
        static assert(false, "Tried to call a method on Fail1");
    }
}

struct Fail2
{
    void opDispatch(string s, T)(T arg)
    {
        static assert(false, "Tried to call a method on Fail2");
    }
}

void main()
{
    auto fail1 = Fail1();
    fail1.s();  // "no property" error instead of static asset failure

    auto fail2 = Fail2();
    fail2.s(1); // "no property" error instead of static asset failure
}