I was recently made aware of D's Uniform Function Call Syntax (UFCS) which is similar but not exactly the same:

    void sun(T, int);

    void moon(T t)
    {
        t.sun(1);
        // If `T` does not have member function `sun`,
        // `t.sun(1)` is interpreted as if it were written `sun(t, 1)`
    }

The nice thing here is that no placeholder like % is needed and it still works with functions that expect multiple parameters.

Docs: https://dlang.org/spec/function.html#pseudo-member