Fix hints in the analyzer package.

pkg/analyzer/lib/src/generated/constant.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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.constant;
 
 import 'dart:collection';
@@ skipping 2659 matching lines @@
    * parsed as an integer, a DartObject representing 'null' is returned.
    */
   DartObject getInt(TypeProvider typeProvider, String name) {
     String value = _declaredVariables[name];
     if (value == null) {
       return new DartObjectImpl(typeProvider.intType, IntState.UNKNOWN_VALUE);
     }
     int bigInteger;
     try {
       bigInteger = int.parse(value);
-    } on FormatException catch (exception) {
+    } on FormatException {
       return new DartObjectImpl(typeProvider.nullType, NullState.NULL_STATE);
     }
     return new DartObjectImpl(typeProvider.intType, new IntState(bigInteger));
   }
 
   /**
    * Return the value of the variable with the given [name] interpreted as a
    * String value, or `null` if the variable is not defined. Return the value of
    * the variable with the given name interpreted as a String value. If the
    * variable is not defined (or [name] is `null`), a DartObject representing
@@ skipping 2386 matching lines @@
       return BoolState.from(_element == rightElement);
     } else if (rightOperand is DynamicState) {
       return BoolState.UNKNOWN_VALUE;
     }
     return BoolState.FALSE_STATE;
   }
 
   @override
   String toString() => _element == null ? "-unknown-" : _element.name;
 }