Function forward

src/simplicity/eval.c:124–126

Given a read frame, advance its cursor by 'n' cells. * * Precondition: NULL != frame. */

 * Precondition: NULL != frame.
 */
static void forward(frameItem* frame, size_t n) {
  frame->offset += n;
}

/* Given a read frame, move its cursor backwards by 'n' cells.
 *