-static bool parse_if_clause (struct lexer *, struct loop_trns *, struct expression **);
-static bool parse_index_clause (struct lexer *, struct loop_trns *, char index_var_name[]);
+static bool parse_if_clause (struct lexer *,
+ struct loop_trns *, struct expression **);
+static bool parse_index_clause (struct dataset *, struct lexer *,
+ struct loop_trns *, bool *created_index_var);