add_pointer
$$ = add_pointer($2, $1);
$$ = add_pointer($2, $1);
$$ = add_pointer($2, $1);
$$ = add_pointer($2, $1);
$$ = add_pointer(abstract_name(), $1);
$$ = add_pointer($2, $1);
$$ = add_pointer($3, $1);
sym_t *add_pointer(sym_t *, qual_ptr *);