re PR c++/50870 ([C++0x] [4.6/4.7 Regression] ICE with decltype, operator->, and…

re PR c++/50870 ([C++0x] [4.6/4.7 Regression] ICE with decltype, operator->, and default template arguments)

	PR c++/50870
	* pt.c (tsubst_copy): Handle NAMESPACE_DECL.
	(tsubst_copy_and_build) [COMPONENT_REF]: Handle a still-dependent
	object.

From-SVN: r181131

gcc/cp/ChangeLog

+2011-11-07  Jason Merrill  <jason@redhat.com>
+
+	PR c++/50870
+	* pt.c (tsubst_copy): Handle NAMESPACE_DECL.
+	(tsubst_copy_and_build) [COMPONENT_REF]: Handle a still-dependent
+	object.
+
 2011-11-07  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* pt.c (tsubst_copy_and_build): Fix qualified_name_lookup_error

gcc/cp/pt.c

@@ -12010,6 +12010,9 @@ tsubst_copy (tree t, tree args, tsubst_flags_t complain, tree in_decl)
       mark_used (t);
       return t;
 
+    case NAMESPACE_DECL:
+      return t;
+
     case OVERLOAD:
       /* An OVERLOAD will always be a non-dependent overload set; an
 	 overload set from function scope will just be represented with an
@@ -13871,7 +13874,9 @@ tsubst_copy_and_build (tree t,
 	if (member == error_mark_node)
 	  return error_mark_node;
 
-	if (object_type && !CLASS_TYPE_P (object_type))
+	if (type_dependent_expression_p (object))
+	  /* We can't do much here.  */;
+	else if (!CLASS_TYPE_P (object_type))
 	  {
 	    if (SCALAR_TYPE_P (object_type))
 	      {

gcc/testsuite/ChangeLog

+2011-11-07  Jason Merrill  <jason@redhat.com>
+
+	PR c++/50870
+	* g++.dg/cpp0x/decltype35.C: New.
+
 2011-11-07  Dodji Seketeli  <dodji@redhat.com>
 
 	Support C++11 alias-declaration

gcc/testsuite/g++.dg/cpp0x/decltype35.C

+// PR c++/50870
+// { dg-options -std=c++0x }
+
+template <class V>
+  struct impl
+  {
+    template <class T> static T create();
+  };
+
+template <class T, class U, class V, class
+      = decltype(impl<V>::template create<T>()
+             -> impl<V>::template create<U>())>
+struct tester { };
+
+tester<impl<float>*, int, float> ti;