Remove NullPointerException.

tests/language/closure3_test.dart

Index: tests/language/closure3_test.dart
diff --git a/tests/language/closure3_test.dart b/tests/language/closure3_test.dart
index 812322877bf86de2122fa8be1768e98125dbeb66..c01bfc14d916a2b059421a7352682e47d41c09ab 100644
--- a/tests/language/closure3_test.dart
+++ b/tests/language/closure3_test.dart
@@ -2,7 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// Test that a NullPointerException is thrown even when an expression
+// Test that a NoSuchMethodError is thrown even when an expression
 // seems to be free of side-effects.
 
 test(x, y) {
@@ -10,11 +10,5 @@ test(x, y) {
 }
 
 main() {
-  try {
-    test(null, 2);
-    Expect.fail('Expected NullPointerException');
-  } on NullPointerException catch (ex) {
-    return;
-  }
-  Expect.fail('Expected NullPointerException');
+  Expect.throws(() { test(null, 2); }, (e) => e is NoSuchMethodError);
 }