--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/fixits.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,41 @@
+/* { dg-do compile } */
+/* { dg-options "-fdiagnostics-show-caret" } */
+
+struct foo { int x; };
+union u { int x; };
+
+/* Verify that we issue a hint for "." used with a ptr to a struct.  */
+
+int test_1 (struct foo *ptr)
+{
+  return ptr.x; /* { dg-error "'ptr' is a pointer; did you mean to use '->'?" } */
+/* { dg-begin-multiline-output "" }
+   return ptr.x;
+             ^
+             ->
+   { dg-end-multiline-output "" } */
+}
+
+/* Likewise for a ptr to a union.  */
+
+int test_2 (union u *ptr)
+{
+  return ptr.x; /* { dg-error "'ptr' is a pointer; did you mean to use '->'?" } */
+/* { dg-begin-multiline-output "" }
+   return ptr.x;
+             ^
+             ->
+   { dg-end-multiline-output "" } */
+}
+
+/* Verify that we don't issue a hint for a ptr to something that isn't a
+   struct or union.  */
+
+int test_3 (void **ptr)
+{
+  return ptr.x; /* { dg-error "request for member 'x' in something not a structure or union" } */
+/* { dg-begin-multiline-output "" }
+   return ptr.x;
+             ^
+   { dg-end-multiline-output "" } */
+}