+/* Tell gcc not to warn about the (i < 0) test, below. */
+#if (__GNUC__ == 4 && 3 <= __GNUC_MINOR__) || 4 < __GNUC__
+# pragma GCC diagnostic ignored "-Wtype-limits"
+#elif defined __clang__
+# pragma clang diagnostic ignored "-Wtautological-compare"
+#endif
+