--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/Wrestrict-21.c	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -Wrestrict" } */
+
+static char *
+str_numth(char *dest, char *num, int type)
+{
+  if (dest != num)
+    __builtin_strcpy(dest, num); /* { dg-bogus "is the same" } */
+  __builtin_strcat(dest, "foo");
+  return dest;
+}
+
+void
+DCH_to_char(char *in, char *out, int collid)
+{
+  char *s = out;
+  str_numth(s, s, 42);
+}