re PR c++/67257 (Internal compiler error in retrieve_specialization)

	PR c++/67257
	* parser.c (cp_parser_single_declaration): Reject a class template
	that also declares a variable.

From-SVN: r231913

gcc/cp/ChangeLog

 2015-12-22  Jason Merrill  <jason@redhat.com>
 
+	PR c++/67257
+	* parser.c (cp_parser_single_declaration): Reject a class template
+	that also declares a variable.
+
 	PR c++/67339
 	* parser.c (cp_parser_elaborated_type_specifier): Use CLASS_TYPE_P
 	rather than check for RECORD_TYPE.

gcc/cp/parser.c

@@ -25642,7 +25642,8 @@ cp_parser_single_declaration (cp_parser* parser,
   /* Check for the declaration of a template class.  */
   if (declares_class_or_enum)
     {
-      if (cp_parser_declares_only_class_p (parser))
+      if (cp_parser_declares_only_class_p (parser)
+	  || (declares_class_or_enum & 2))
 	{
 	  // If this is a declaration, but not a definition, associate
 	  // any constraints with the type declaration. Constraints
@@ -25673,6 +25674,19 @@ cp_parser_single_declaration (cp_parser* parser,
 
 	  /* Perform access checks for template parameters.  */
 	  cp_parser_perform_template_parameter_access_checks (checks);
+
+	  /* Give a helpful diagnostic for
+	       template <class T> struct A { } a;
+	     if we aren't already recovering from an error.  */
+	  if (!cp_parser_declares_only_class_p (parser)
+	      && !seen_error ())
+	    {
+	      error_at (cp_lexer_peek_token (parser->lexer)->location,
+			"a class template declaration must not declare "
+			"anything else");
+	      cp_parser_skip_to_end_of_block_or_statement (parser);
+	      goto out;
+	    }
 	}
     }
 

gcc/testsuite/g++.dg/cpp0x/pr51226.C

@@ -6,4 +6,7 @@ template<int> struct A           // { dg-message "provided" }
   enum E : int;
 };
 
-template<> enum A<>::E : int {}  // { dg-error "wrong number|expected" }
+template<> enum A<>::E : int {}  // { dg-error "wrong number" }
+
+// { dg-prune-output "expected" }
+// { dg-prune-output "specialization" }

gcc/testsuite/g++.dg/cpp1y/auto-fn28.C

+// PR c++/67257
+// { dg-do compile { target c++14 } }
+
+template <typename> struct plus;
+template <typename> struct A {
+  template <typename T> auto operator()(T);
+} foldl;			// { dg-error "" }
+void foo() { foldl<plus<int>>(0); }
+
+// { dg-prune-output "not declared" }
+// { dg-prune-output "expected" }