Followup to https://codereview.chromium.org/1450393002/

lib/system/system.dart

 // Copyright (c) 2015, the Fletch 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.md file.
 
 library dart.fletch._system;
 
 import 'dart:_internal' hide Symbol;
 import 'dart:collection';
 import 'dart:fletch';
 import 'dart:math';
 
 part 'list.dart';
 part 'map.dart';
 part 'nsm.dart';
 
 const native = "native";
 
+const patch = "patch";
+
 const bool enableBigint =
     const bool.fromEnvironment('fletch.enable-bigint', defaultValue: true);
 
 // These strings need to be kept in sync with the strings allocated
 // for the raw failure objects in src/vm/program.cc.
 const wrongArgumentType = "Wrong argument type.";
 const indexOutOfBounds = "Index out of bounds.";
 const illegalState = "Illegal state.";
 
 // This enum must be kept in sync with the Interpreter::InterruptKind
@@ skipping 50 matching lines @@
 }
 
 /// Make the current process yield. Either to allow other fibers to
 /// make progress or to terminate execution.
 external yield(int reason);
 
 external get nativeError;
 
 // Change execution to [coroutine], passing along [argument].
 external coroutineChange(coroutine, argument);
-
-const patch = "patch";