--- /dev/null
+/* Copyright (C) 2000 Free Software Foundation, Inc. */
+
+/* { dg-do run } */
+
+/* This string contains embedded nulls which should be preserved. */
+static char x[] = "A string /* { dg-warning "null.*string" "nulls in string" { target *-*-* } 6 } */
+
+#include <string.h>
+
+int
+main ()
+{
+ return strlen(x) != 8;
+}
+
+/* This comment with preprocessor silently. */
+
+/* Some random nulls among whitespace to be warned about once. */
+
+#define N
+#if 0 == '#endif
+
+#if 0#endif
+
+/* The null here should act as a whitespace separator. */
+#define X
+#if X != 1
+#error /* { dg-bogus "error" "Check X defined OK" } */
+#endif
+