Test case:

---------------------------------------------------
static assert(is(int == typeof(0)));

void p()(int a) { pragma(msg, "OK(p)"); }
void p()() { pragma(msg, "Err(p)"); }

void r(R=typeof(0))(R a) { pragma(msg, "OK(r)"); }
void r()() { pragma(msg, "Err(r)"); }

void s()(typeof(0) a) { pragma(msg, "OK(s)"); }

void t(typeof(0) a) { }
void t() { }

void q()(typeof(0) a) { pragma(msg, "OK(q)"); }
void q()() { pragma(msg, "Err(q)"); }

void main() {
    p!()(5);    // without typeof() is ok
    r!()(5);    // put that typeof() elsewhere is ok
    s!()(5);    // no overloading is ok
    t(5);       // no template is ok
    q!()(5);    // Error
}
---------------------------------------------------
OK(p)
OK(r)
OK(s)
x.d(22): Error: template x.q() does not match any function template declaration
x.d(22): Error: template x.q() cannot deduce template function from argument types !()(int)
x.d(22): Error: template instance errors instantiating template
---------------------------------------------------

Probably the same as issue 4413, except it affects more than typeof(this).