sclass Timed<A> extends Var<A> {
  double ms;
  
  *() {}
  *(A value, long *ms) { super(value); }
  *(A value, double *ms) { super(value); }
  
  toString { ret "[" + renderedTime() + "] " + super.toString(); }
  
  double ms() { ret ms; }
  double nanos() { ret msToNanos(ms); }
  
  S renderedTime() { ret formatDouble(ms, 3) + " ms"; }
}