--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/bad-dereference.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,24 @@
+/* { dg-options "-fdiagnostics-show-caret" } */
+
+struct foo
+{
+  int x;
+};
+
+int test_1 (struct foo some_f)
+{
+  return *some_f.x; /* { dg-error "invalid type argument of unary ... .have .int.." } */
+/* { dg-begin-multiline-output "" }
+   return *some_f.x;
+          ^~~~~~~~~
+   { dg-end-multiline-output "" } */
+}
+
+int test_2 (struct foo some_f)
+{
+  return *some_f; /* { dg-error "invalid type argument of unary ... .have .struct foo.." } */
+/* { dg-begin-multiline-output "" }
+   return *some_f;
+          ^~~~~~~
+   { dg-end-multiline-output "" } */
+}