-int lex_force_match (int);
-int lex_force_match_id (const char *);
-int lex_force_int (void);
-int lex_force_num (void);
-int lex_force_id (void);
-int lex_force_string (void);
+bool lex_force_match (int);
+bool lex_force_match_id (const char *);
+bool lex_force_int (void);
+bool lex_force_num (void);
+bool lex_force_id (void);
+bool lex_force_string (void);