--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/pr70756.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,23 @@
+/* PR c/70756 */
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+enum E e; /* { dg-error "storage size|use of enum" } */
+int (*A)[];
+
+void
+fn0 (void)
+{
+  struct
+  {
+    int x;
+    int y[];
+  } s;
+  1234 && &s.y + 1; /* { dg-error "16:invalid use of" } */
+}
+
+void
+fn1 (void)
+{
+  1234, A += 1; /* { dg-error "11:invalid use of array with unspecified bounds" } */
+}