aliasCall

static struct S
{
    auto lightConst()() const @property { return S(); }

    auto fun(size_t ct_param = 1)(size_t rt_param) const
    {
        return rt_param + ct_param;
    }
}

S s;

auto sfun = aliasCall!"fun"(s);
assert(sfun(3) == 4);

auto sfun10 = aliasCall!("fun", 10)(s);   // uses fun!10
assert(sfun10(3) == 13);