string addParameter (string parameters, string newParameter) ()
{
    return parameters is null ? newParameter : parameters ~ "," ~ newParameter;
}

struct Proxy (alias func, string parameters, Args ...)
{
    Args args;

    auto opDispatch (string name, T) (T value)
    {
        return Proxy!(func, addParameter!(parameters, name), Args, T)(args, value);
    }

    auto call () ()
    {
        return callNamed!(func, parameters)(args);
    }
}

Proxy!(func, null) named (alias func) ()
{
    return Proxy!(func, null)();
}

int foo (int a, int b)
{
    writefln("a=%d b=%d", a, b);
    return b;
}

void main ()
{
    named!(foo).b(3).a(4).call();
}