+/* define a NORETURN attribute */
+#ifndef NORETURN
+# if defined(__GNUC__)
+# if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 70)
+# define NORETURN void __attribute__ ((noreturn))
+# endif /* __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 70) */
+# endif /* defined(__GNUC__) */
+
+# 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:
+ * %E expression_t const*
+ * %K token_t const*
+ * %k token_kind_t
+ * %#k va_list*, char const*
+ * %N entity_t const*
+ * %#N entity_t const*
+ * %P source_position_t const*
+ * %Q unsigned (qualifier)
+ * %S string_t const*
+ * %T type_t const*
+ * %#T type_t const*, symbol_t const*
+ * %Y symbol_t const*
+ */