this is almost a workaround for the lack of named parameters

[J]

#!/usr/bin/rdmd
void main(string[] arg) {

   // Observation: I'd like to say:
   /*
   auto r = myfunc.call("named") with { z= 2; x = -123; y = 200; }
   */

   // and have it turned into this:
   with(myfunc) { x = -123; y = 200; z = -20; }
   auto r = myfunc.call("named");

   // Q: is there some way to achieve this? Maybe a variation on 
with?

   // Is there a macro facility lurking someplace?  Or is there 
another way to do this?
   // Thanks!
   // - J
}

import std.stdio;

struct myfunc_
{
    // named keyword or named parameters
    // --the call arguments and their defaults
    int x=0;
    int y=0;
    int z=0;

    string call(string non_keyword_arg)
    {
      writefln("%s:  X %s, Y %s, Z %s", non_keyword_arg, x, y, z );
      return "yo";
    }
}
myfunc_ myfunc;