Fix hints in the analyzer package.

pkg/analyzer/test/reflective_tests.dart

 // Copyright (c) 2014, 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.
 
 library reflective_tests;
 
 @MirrorsUsed(metaTargets: 'ReflectiveTest')
 import 'dart:mirrors';
 import 'dart:async';
 
@@ skipping 57 matching lines @@
         });
       }
     });
   });
 }
 
 Future _invokeSymbolIfExists(InstanceMirror instanceMirror, Symbol symbol) {
   var invocationResult = null;
   try {
     invocationResult = instanceMirror.invoke(symbol, []).reflectee;
-  } on NoSuchMethodError catch (e) {}
+  } on NoSuchMethodError {}
   if (invocationResult is Future) {
     return invocationResult;
   } else {
     return new Future.value(invocationResult);
   }
 }
 
 /**
  * Run a test that is expected to fail, and confirm that it fails.
  *
@@ skipping 23 matching lines @@
  */
 class ReflectiveTest {
   const ReflectiveTest();
 }
 
 /**
  * A marker annotation used to instruct dart2js to keep reflection information
  * for the annotated classes.
  */
 const ReflectiveTest reflectiveTest = const ReflectiveTest();