So how do we want to handle definitions?  Read a defs.txt file at
compile time?  Build defs.c from defs.txt?

void
defname(JoyListPtr stack, JoyListPtr expression)
{
	def_node = some C initializer?
	def_node = text_to_expression("dup mul");
	push_quote(def_node, expression);
}

...?

I think the easiest thing to do at the mo' would be to hardcode the defs
as an array of strings and then read them and convert at start time?












	/*mpz_t pi;*/
	/*char *text = (char *)TEXT;*/
	/*mpz_init_set_str(pi, "3141592653589793238462643383279502884", 10);*/
	/*mpz_init_set_str(pi, "25d0c79fe247f31777d922627a74624", 16);*/
	/*GC_register_finalizer(pi, my_callback, NULL, NULL, NULL);*/

	/*el = push_integer_from_str("3141592653589793238462643383279502884", 0);*/
	/*el->tail = text_to_expression(text);*/
	/*el = text_to_expression(text);*/
	/*print_list(el);*/
	/*printf("\n");*/

  concat
cons
dip
dup
first
loop
pop
rest
stack
swaack
swap


pop_any(), pop_int(), and add

With cmp (provided by the GMP lib) we can implement the rest of
the comparison functions as definitions:

     G       E       L
 eq [false] [true] [false] cmp
 gt [true] [false] [false] cmp
 lt [false] [false] [true] cmp
neq [true] [false] [true] cmp
 le [false] [true] [true] cmp
 ge [true] [true] [false] cmp