--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Sema/warn-unused-label.c	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,15 @@
+// RUN: %clang_cc1 -fsyntax-only -Wunused-label -verify %s
+
+void f() {
+  a:
+  goto a;
+  b: // expected-warning{{unused}}
+  c: __attribute__((unused));
+  d: __attribute__((noreturn)); // expected-warning {{'noreturn' attribute only applies to functions}}
+  goto d;
+  return;
+}
+
+void PR8455() {
+  L: __attribute__((unused)) return; // ok, no semicolon required
+}