sb def; /* The default value. */
sb actual; /* The actual argument (changed on each expansion). */
int index; /* The index of the formal 0..formal_count - 1. */
+ enum formal_type
+ {
+ FORMAL_OPTIONAL,
+ FORMAL_REQUIRED,
+ FORMAL_VARARG
+ } type; /* The kind of the formal. */
} formal_entry;
/* Other values found in the index field of a formal_entry. */