--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/Wrestrict-3.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,17 @@
+/* Test to verify that the call below with the out-of-bounds offset
+   doesn't trigger an internal assertion and is diagnosed.
+   { dg-do compile }
+   { dg-options "-O2 -Wrestrict" } */
+
+#define DIFF_MAX   __PTRDIFF_MAX__
+
+void test_no_ice (int *d, __PTRDIFF_TYPE__ i, __SIZE_TYPE__ n)
+{
+  if (i < DIFF_MAX / sizeof *d - 1 || DIFF_MAX / sizeof *d + 2 < i)
+    i = DIFF_MAX / sizeof *d - 1;
+
+  if (n < DIFF_MAX)
+    n = DIFF_MAX / sizeof *d;
+
+  __builtin_strncpy ((char*)(d + i), (char*)d, n);   /* { dg-warning "\\\[-Wrestrict]" } */
+}