-void parser_print_prefix_pos(source_position_t);
-void parser_print_warning_prefix_pos(source_position_t);
-void parse_warning_pos(source_position_t, const char *message);
-void parse_warning_posf(source_position_t, const char *fmt, ...);
+# if defined(_MSC_VER)
+# define NORETURN void __declspec(noreturn)
+# endif /* defined(_MSC_VER) */
+
+/* If not set above, use "void" for DOES_NOT_RETURN. */
+# ifndef NORETURN
+# define NORETURN void
+# endif /* ifndef NORETURN */
+#endif /* ifndef NORETURN */
+
+/**
+ * Issue a diagnostic message.
+ * Format types:
+ * %Y const symbol_t *
+ * %E const expression_t *
+ * %Q unsigned (qualifier)
+ * %T const type_t*
+ * %K const token_t*
+ * %k token_kind_t
+ * %P const source_position_t *
+ * %S const string_t *
+ */
+void diagnosticf(const char *fmt, ...);
+void errorf(const source_position_t *pos, const char *fmt, ...);
+void warningf(const source_position_t *pos, const char *fmt, ...);
+NORETURN internal_errorf(const source_position_t *pos, const char *fmt, ...);
+
+extern unsigned diagnostic_count;
+extern unsigned error_count;
+extern unsigned warning_count;