--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/init-desig-obs-1.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,19 @@
+/* Test obsolete forms of designated initializers.  Test with default
+   warning options: valid forms are accepted, while ".member" without
+   "=" should not be (bug 16667).  */
+/* Origin: Joseph Myers <jsm@polyomino.org.uk> */
+/* { dg-do compile } */
+/* { dg-options "" } */
+struct s { int a; };
+struct s s0 = { .a = 1 };
+struct s s1 = { a: 1 };
+
+int x0[] = { [0] = 1 };
+int x1[] = { [0] 1 };
+
+/* Invalid syntax: multiple designators without "=".  */
+int x2[2][2] = { [0][0] 1 }; /* { dg-error "syntax error|parse error|expected" } */
+
+
+/* Invalid syntax: C99-style structure designator without "=".  */
+struct s s2 = { .a 1 }; /* { dg-error "syntax error|parse error|expected" } */