PR c++/81506 - Invalid declaration with decltype accepted

testsuite/ChangeLog:
	* g++.dg/cpp0x/decltype-pr81506.C: New test.

From-SVN: r270006

gcc/testsuite/ChangeLog

+2019-03-28  Martin Sebor  <msebor@redhat.com>
+
+	PR c++/81506
+	* g++.dg/cpp0x/decltype-pr81506.C: New test.
+
 2019-03-28  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/89612 - ICE with member friend template with noexcept.

gcc/testsuite/g++.dg/cpp0x/decltype-pr81506.C

+// PR c++/81506 - Invalid declaration with decltype accepted
+// { dg-do compile }
+//
+
+#if __cplusplus < 201103L
+# define decltype __typeof__
+#endif
+
+template <int>
+struct A
+{
+  A () {
+    decltype (this);     // { dg-error "declaration does not declare anything" }
+  }
+};
+
+A<0> a;
+
+template <class>
+struct B
+{
+  B () {
+    __typeof__ (this);   // { dg-error "declaration does not declare anything" }
+  }
+};
+
+B<int> b;
+