diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index ce4ade16a84..572090ad9a7 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,5 +1,9 @@
 2011-03-04  Jason Merrill  <jason@redhat.com>
 
+	PR c++/47971
+	* pt.c (tsubst_copy_and_build) [PSEUDO_DTOR_EXPR]: Use tsubst for type.
+	(tsubst_copy) [default]: Just return t if !ENABLE_CHECKING.
+
 	PR c++/46220
 	* search.c (check_final_overrider): Allow pointer to same incomplete
 	class type with different cv-quals.
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index c52bb74eba8..dfc972870f4 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -11727,7 +11727,9 @@ tsubst_copy (tree t, tree args, tsubst_flags_t complain, tree in_decl)
       return t;
 
     default:
-      gcc_unreachable ();
+      /* We shouldn't get here, but keep going if !ENABLE_CHECKING.  */
+      gcc_checking_assert (false);
+      return t;
     }
 }
 
@@ -12984,7 +12986,7 @@ tsubst_copy_and_build (tree t,
       return finish_pseudo_destructor_expr
 	(RECUR (TREE_OPERAND (t, 0)),
 	 RECUR (TREE_OPERAND (t, 1)),
-	 RECUR (TREE_OPERAND (t, 2)));
+	 tsubst (TREE_OPERAND (t, 2), args, complain, in_decl));
 
     case TREE_LIST:
       {
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index c56bea48f04..1e541053e13 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,7 @@
 2011-03-04  Jason Merrill  <jason@redhat.com>
 
+	* g++.dg/template/pseudodtor6.C: New.
+
 	* g++.dg/inherit/covariant19.C: New.
 
 2011-03-04  Richard Guenther  <rguenther@suse.de>
diff --git a/gcc/testsuite/g++.dg/template/pseudodtor6.C b/gcc/testsuite/g++.dg/template/pseudodtor6.C
new file mode 100644
index 00000000000..4438b6ffb33
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/pseudodtor6.C
@@ -0,0 +1,9 @@
+// PR c++/47971
+
+template <typename> struct S
+{
+  typedef double T;
+  S () { T ().~T (); }
+};
+
+S<double> s;