Struct constructor and opCall confussion

[Tom]

D2 Code:

int main(string[] args) {
        struct S {
                int i;
                this(int i) { this.i = i; }
                void opCall(int x, int y) { }
        }
        
        S s;
        s(4, 1);
        
        return 0;
}

src\main.d(12): Error: constructor main.main.S.this (int i) is not 
callable using argument types (int,int)
src\main.d(12): Error: expected 1 arguments, not 2 for non-variadic 
function type ref S(int i)


Am I missing something or is this another major bug?

T.I.A.,
Tom;