re PR c++/51852 ([c++11] tree check: expected tree_list, have HßèMÕþÿøtxøtsø)

	PR c++/51852
	* pt.c (tsubst_pack_expansion): Delete and restore
	local_specialization whenever need_local_specialization, not just
	when saved_local_specializations is non-NULL.

	* g++.dg/other/gc5.C: New test.

From-SVN: r183637

gcc/cp/ChangeLog

+2012-01-27  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/51852
+	* pt.c (tsubst_pack_expansion): Delete and restore
+	local_specialization whenever need_local_specialization, not just
+	when saved_local_specializations is non-NULL.
+
 2012-01-26  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/51370

gcc/cp/pt.c

@@ -9582,7 +9582,7 @@ tsubst_pack_expansion (tree t, tree args, tsubst_flags_t complain,
         }
     }
 
-  if (saved_local_specializations)
+  if (need_local_specializations)
     {
       htab_delete (local_specializations);
       local_specializations = saved_local_specializations;

gcc/testsuite/ChangeLog

+2012-01-27  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/51852
+	* g++.dg/other/gc5.C: New test.
+
 2012-01-27  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/50444

gcc/testsuite/g++.dg/other/gc5.C

+// PR c++/51852
+// { dg-do compile }
+// { dg-options "-std=gnu++11 --param ggc-min-heapsize=0 --param ggc-min-expand=0" }
+
+template <typename, typename>
+class transformed {};
+
+template <class R, class F>
+transformed<F, R> transform (R r, F f);
+
+template <typename, typename>
+class joined {};
+
+template <typename T, typename U>
+joined<T, U> join (T t, U u);
+
+template <typename T, typename U, typename V, typename... Rest>
+auto join (T t, U u, V v, Rest... rest) -> decltype (join (join (t, u), v, rest...));
+
+template <typename F, typename... Rs>
+auto polymorphic_transform (F f, Rs... rs) -> decltype (join (transform(rs, f)...));
+
+int
+main ()
+{
+  polymorphic_transform (0, 0, 0);
+}