// The real begin routine is in assembler.
// It its beginning RSP in location other and calls startR.
// That causes the first output from code R (0 just now) to be returned
// as the value of this function.
#include <stdlib.h>
#define SSize (1<<20)
extern long int RSP; // imaginary stack pointer
#include "x.h"
vL begin(){
// Push onto the old stack whatever PutGetR will pop off when first called.
  other = RSP;
  RSP = SSize + (long int)malloc(SSize);
  return startR(11);}