Re: this is almost a workaround for the lack of named parameters

[J]

  /*  Similarly but different (here I am instantiating a new 
struct
      before the call, rather than re-using a global single 
struct each time),
      it would be lovely and elegant to say:
  */

void main(string[] arg) {
  /* Elegant:

     auto r = myfunc() with { z= 2; x = -123; y = 200; }

  */

  // and have it lowered to:
  myfunc tmp;
  with(tmp) { z= 2; x = -123; y = 200; }
  auto r = tmp();

}

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;

  // opCall is sweet... improves upon previous example

   string opCall(string required_positional_arg = "default pos 
arg value") {
     writefln("%s:  X %s, Y %s, Z %s", required_positional_arg, 
x, y, z );
     return "yo";
   }

}