// This produces a stream from "Hello world".
#include <stdlib.h>
#include "pushy.h"
typedef struct {unode un; char *a;} hllo;
static void rptr(unode* n){
  char a = *(((hllo*)n)->a++);
  if(a) (n->dn->code)(a, n->dn, n);
  else {free(n); exit(0);}
}
unode* chllo(dnode* n, char* a){
  hllo* r = (hllo*)malloc(sizeof(hllo));
  *r = (hllo){(unode){rptr, n}, a};
  return &r->un;}