/* Stack of data placed on obstacks. */
/* Pointer back to previous such level. */
struct stack_level
*prev
;
/* Point to obstack we should return to. */
/* First place we start putting data. */
/* Number of entries we can have from `first'.
Right now we are dumb: if we overflow, abort. */
struct stack_level
*push_stack_level ();
struct stack_level
*pop_stack_level ();