re PR c++/53492 (ICE in retrieve_specialization, at cp/pt.c:985)

	PR c++/53492
	* parser.c (cp_parser_class_head): Also check PRIMARY_TEMPLATE_P
	when deciding whether to call push_template_decl for a member class.
	* pt.c (push_template_decl_real): Return after wrong levels error.

From-SVN: r208455

gcc/cp/ChangeLog

+2014-03-10  Jason Merrill  <jason@redhat.com>
+
+	PR c++/53492
+	* parser.c (cp_parser_class_head): Also check PRIMARY_TEMPLATE_P
+	when deciding whether to call push_template_decl for a member class.
+	* pt.c (push_template_decl_real): Return after wrong levels error.
+
 2014-03-08  Adam Butcher  <adam@jessamine.co.uk>
 
 	PR c++/60033

gcc/cp/parser.c

@@ -19888,7 +19888,13 @@ cp_parser_class_head (cp_parser* parser,
       pushed_scope = push_scope (nested_name_specifier);
       /* Get the canonical version of this type.  */
       type = TYPE_MAIN_DECL (TREE_TYPE (type));
-      if (PROCESSING_REAL_TEMPLATE_DECL_P ()
+      /* Call push_template_decl if it seems like we should be defining a
+	 template either from the template headers or the type we're
+	 defining, so that we diagnose both extra and missing headers.  */
+      if ((PROCESSING_REAL_TEMPLATE_DECL_P ()
+	   || (CLASSTYPE_TEMPLATE_INFO (TREE_TYPE (type))
+	       && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE
+				      (TREE_TYPE (type)))))
 	  && !CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_TYPE (type)))
 	{
 	  type = push_template_decl (type);

gcc/cp/pt.c

@@ -4908,6 +4908,8 @@ push_template_decl_real (tree decl, bool is_friend)
 	{
 	  error ("expected %d levels of template parms for %q#D, got %d",
 		 i, decl, TMPL_ARGS_DEPTH (args));
+	  DECL_INTERFACE_KNOWN (decl) = 1;
+	  return error_mark_node;
 	}
       else
 	for (current = decl; i > 0; --i, parms = TREE_CHAIN (parms))

gcc/testsuite/g++.dg/template/memtmpl4.C

+// PR c++/53492
+
+template<typename T> struct A
+{
+  template<typename U> struct B;
+};
+
+template <> template<class T> struct A<T>::B { }; // { dg-error "expected 2 levels" }
+
+A<int>::B<int> b;		// { dg-error "" }