Add empty to term types

lib/parse.c

@@ -239,8 +239,7 @@ void parse_free_sequence_children(const parse_sequence_t *s)
 			case PARSE_TERM_SUBEXPR:
 				parse_free_tree_children(&s->contents[i].subexpr);
 				break;
-			case PARSE_TERM_WILDCARD:
-			case PARSE_TERM_LITERAL:
+			default:
 				break;
 			}
 		}
@@ -253,3 +252,4 @@ void parse_free_class_children(const parse_class_t *c)
 	if (NULL != c->contents)
 		free(c->contents);
 }
+

lib/parse.h

@@ -26,6 +26,7 @@ typedef enum {
 	PARSE_TERM_CLASS,
 	PARSE_TERM_LITERAL,
 	PARSE_TERM_SUBEXPR,
+	PARSE_TERM_EMPTY,
 } parse_term_type_t;
 
 struct _parse_term;