re PR c++/59347 (ICE on invalid: tree check: expected class 'type', have…

re PR c++/59347 (ICE on invalid: tree check: expected class 'type', have 'exceptional' (error_mark) in tsubst_decl, at cp/pt.c:10798)

	PR c++/59347
	* pt.c (tsubst_decl) [TYPE_DECL]: Don't try to instantiate an
	erroneous typedef.

From-SVN: r208025

gcc/cp/ChangeLog

 2014-02-21  Jason Merrill  <jason@redhat.com>
 
+	PR c++/59347
+	* pt.c (tsubst_decl) [TYPE_DECL]: Don't try to instantiate an
+	erroneous typedef.
+
 	PR c++/60241
 	* pt.c (lookup_template_class_1): Update DECL_TEMPLATE_INSTANTIATIONS
 	of the partial instantiation, not the most general template.

gcc/cp/pt.c

@@ -10824,6 +10824,9 @@ tsubst_decl (tree t, tree args, tsubst_flags_t complain)
 	tree type = NULL_TREE;
 	bool local_p;
 
+	if (TREE_TYPE (t) == error_mark_node)
+	  RETURN (error_mark_node);
+
 	if (TREE_CODE (t) == TYPE_DECL
 	    && t == TYPE_MAIN_DECL (TREE_TYPE (t)))
 	  {

gcc/testsuite/g++.dg/template/typedef41.C

+// PR c++/59347
+
+template<int> struct A
+{
+  typedef int ::X;		// { dg-error "" }
+};
+
+A<0> a;