DouKaku?

module doukaku;
private import std.stdio;
void main() { std.stdio.writefln("Hello, world!"); }

module doukaku;
private import std.stdio;

class Hello
{
  this()
  {
    writef("Hello");
  }

  void puts(void delegate() dg)
  {
    dg();
  }

  ~this()
  {
    writef(" world!\n");
  }
}

int main()
{
  (new Hello()).puts(
  {
    writef(",");
  });
  return 0;
}