better parsing information object class sets
diff --git a/libasn1parser/asn1p_expr.h b/libasn1parser/asn1p_expr.h
index 6f2503b..524f532 100644
--- a/libasn1parser/asn1p_expr.h
+++ b/libasn1parser/asn1p_expr.h
@@ -281,7 +281,10 @@
void *resolver_arg);
void asn1p_expr_add(asn1p_expr_t *to, asn1p_expr_t *what);
void asn1p_expr_add_many(asn1p_expr_t *to, asn1p_expr_t *from_what);
+int asn1p_expr_compare(const asn1p_expr_t *, const asn1p_expr_t *);
void asn1p_expr_free(asn1p_expr_t *expr);
+void asn1p_expr_set_source(asn1p_expr_t *, asn1p_module_t *, int lineno);
+
#define TAG2STRING_BUFFER_SIZE 64 /* buf should be at least this big */
char *asn1p_tag2string(struct asn1p_type_tag_s *tag, char *opt_buf);