re PR c++/18729 (ICE on invalid typedef)

cp:
	PR c++/18729
	* parser.c (cp_parser_class_name): Check decl's type is not
	error_mark_node.
testsuite:
	PR C++/18729
	* g++.dg/parse/crash20.C: New.

From-SVN: r91566

gcc/cp/ChangeLog

 2004-12-01  Nathan Sidwell  <nathan@codesourcery.com>
 
+	PR c++/18729
+	* parser.c (cp_parser_class_name): Check decl's type is not
+	error_mark_node.
+
 	PR c++/17431
 	* call.c (standard_conversion): Add FLAGS parameter. Do not allow
 	derived to base conversion when checking constructor

gcc/cp/parser.c

@@ -12232,6 +12232,7 @@ cp_parser_class_name (cp_parser *parser,
     decl = TYPE_NAME (make_typename_type (scope, decl, tag_type, tf_error));
   else if (decl == error_mark_node
 	   || TREE_CODE (decl) != TYPE_DECL
+	   || TREE_TYPE (decl) == error_mark_node
 	   || !IS_AGGR_TYPE (TREE_TYPE (decl)))
     {
       cp_parser_error (parser, "expected class-name");

gcc/testsuite/ChangeLog

 2004-12-01  Nathan Sidwell  <nathan@codesourcery.com>
 
+	PR C++/18729
+	* g++.dg/parse/crash20.C: New.
+
 	PR c++/17431
 	* g++.dg/overload/arg1.C: New.
 	* g++.dg/overload/arg2.C: New.

gcc/testsuite/g++.dg/parse/crash20.C

+// { dg-do compile }
+
+// Copyright (C) 2004 Free Software Foundation, Inc.
+// Contributed by Nathan Sidwell 1 Dec 2004 <nathan@codesourcery.com>
+
+// PR 18729: ICE on ill formed
+// Origin: Volker Reichelt <reichelt@gcc.gnu.org>
+
+template<typename T> struct A
+{
+  typedef typename T::X Y; // { dg-error "not a class" "" }
+};
+
+A<int>::Y y; // { dg-error "instantiated from here" "" }