if (debug & 4) {
/*	fprintf(stderr, "%8lx %8lx %8ld %8ld %8ld\n",
	    stack, stack_base, *markstack_ptr, stack_sp-stack_base, stack_max-stack_base);
	fprintf(stderr, "%8lx %8lx %8ld %l8d %8ld\n",
	    curstack, stack->av_array, curstack, stack->av_fill, stack->av_max);
*/
	fprintf(stderr, "STACK");
	for (i = 0; i <= 30; i++) {
	    if (stack->av_array[i] || stack->av_array[i+1] || stack->av_array[i+2])
		fprintf(stderr, "\t%s%s", SvPEEK(stack->av_array[i]),
		    stack_sp == &stack->av_array[i] ? " *" : "");
	}
	fprintf(stderr, "\n");
    }