Issue 5887. Parts must start with 'part of'.

compiler/javatests/com/google/dart/compiler/end2end/inc/some.dart

Index: compiler/javatests/com/google/dart/compiler/end2end/inc/some.dart
diff --git a/compiler/javatests/com/google/dart/compiler/end2end/inc/some.dart b/compiler/javatests/com/google/dart/compiler/end2end/inc/some.dart
index fc5b2cbd543d73b5e1a4dc52fd34d8f0f9d99b44..0bb2c0dd0665f3b6c404381e8fb24764b25c3927 100644
--- a/compiler/javatests/com/google/dart/compiler/end2end/inc/some.dart
+++ b/compiler/javatests/com/google/dart/compiler/end2end/inc/some.dart
@@ -1,6 +1,7 @@
 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // 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.
+part of some_lib;
 
 abstract class SomeClass {
   factory SomeClass(arg) = SomeClassImpl;