Enable dartanalyze warnings.

mojo/public/dart/src/handle.dart

 // Copyright 2014 The Chromium Authors. 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 core;
 
 class _MojoHandleNatives {
   static int register(MojoEventStream eventStream) native "MojoHandle_Register";
   static int close(int handle) native "MojoHandle_Close";
   static List wait(
@@ skipping 26 matching lines @@
     switch (mwr.result) {
       case MojoResult.OK:
         return true;
       case MojoResult.DEADLINE_EXCEEDED:
       case MojoResult.CANCELLED:
       case MojoResult.INVALID_ARGUMENT:
       case MojoResult.FAILED_PRECONDITION:
         return false;
       default:
         // Should be unreachable.
-        throw "Unexpected result $res for wait on $h";
+        throw "Unexpected result $mwr for wait on $h";
     }
   }
 
   bool get readyRead => _ready(MojoHandleSignals.PEER_CLOSED_READABLE);
   bool get readyWrite => _ready(MojoHandleSignals.WRITABLE);
 
   static MojoWaitManyResult waitMany(
       List<int> handles, List<int> signals, int deadline) {
     List result = _MojoHandleNatives.waitMany(handles, signals, deadline);
     return new MojoWaitManyResult(
@@ skipping 11 matching lines @@
       return "MojoHandle(INVALID)";
     }
     var mwr = wait(MojoHandleSignals.kAll, 0);
     return "MojoHandle(h: $h, status: $mwr)";
   }
 
   bool operator ==(MojoHandle other) {
     return h == other.h;
   }
 }