--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/label-decl-2.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,16 @@
+/* Test diagnostics for label declarations.  Test with -pedantic.  */
+/* Origin: Joseph Myers <joseph@codesourcery.com> */
+/* { dg-do compile } */
+/* { dg-options "-pedantic" } */
+
+typedef int b;
+
+void
+f (void)
+{
+  __label__ a, b, c, d; /* { dg-warning "ISO C forbids label declarations" "label decls" } */
+  __extension__ (void)&&d; /* { dg-error "label 'd' used but not defined" } */
+  goto c; /* { dg-error "label 'c' used but not defined" } */
+ a: (void)0;
+ b: (void)0;
+}