diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index f85f4b1619f..75c0c53dc8e 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,5 +1,9 @@
 2010-11-10  Jason Merrill  <jason@redhat.com>
 
+	PR c++/46420
+	* pt.c (tsubst_copy_and_build) [TARGET_EXPR]: New case.
+	[CONSTRUCTOR]: Use the tsubsted type.
+
 	PR c++/46369
 	* semantics.c (cxx_eval_bit_field_ref): New.
 	(cxx_eval_constant_expression): Call it.
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 7a06038c674..56b7543504c 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -13197,6 +13197,7 @@ tsubst_copy_and_build (tree t,
 	if (TREE_HAS_CONSTRUCTOR (t))
 	  return finish_compound_literal (type, r);
 
+	TREE_TYPE (r) = type;
 	return r;
       }
 
@@ -13316,6 +13317,12 @@ tsubst_copy_and_build (tree t,
 	return build_lambda_object (r);
       }
 
+    case TARGET_EXPR:
+      /* We can get here for a constant initializer of non-dependent type.
+         FIXME stop folding in cp_parser_initializer_clause.  */
+      gcc_assert (TREE_CONSTANT (t));
+      return get_target_expr (RECUR (TARGET_EXPR_INITIAL (t)));
+
     default:
       /* Handle Objective-C++ constructs, if appropriate.  */
       {
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 1115512a2d3..467290d51b0 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2010-11-10  Jason Merrill  <jason@redhat.com>
+
+	* g++.dg/cpp0x/constexpr-46420.C: New.
+
 2010-11-10  Joseph Myers  <joseph@codesourcery.com>
 
 	* g++.dg/ext/bitfield2.C, g++.dg/ext/bitfield4.C,
diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-46420.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-46420.C
new file mode 100644
index 00000000000..757a6e315b0
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-46420.C
@@ -0,0 +1,13 @@
+// PR c++/46420
+// { dg-options -std=c++0x }
+
+template<typename> class vector { };
+struct A{};
+template <class T1>
+void complete_test(vector<T1> data1){
+        A drop=A();
+}
+int main(){
+  vector<double> vect1;
+  complete_test(vect1);
+}