Fix hints in the analyzer package.

pkg/analyzer/test/generated/resolver_test.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 engine.resolver_test;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
@@ skipping 11480 matching lines @@
   }
 }
 
 @reflectiveTest
 class TypeOverrideManagerTest extends EngineTestCase {
   void test_exitScope_noScopes() {
     TypeOverrideManager manager = new TypeOverrideManager();
     try {
       manager.exitScope();
       fail("Expected IllegalStateException");
-    } on IllegalStateException catch (exception) {
+    } on IllegalStateException {
       // Expected
     }
   }
 
   void test_exitScope_oneScope() {
     TypeOverrideManager manager = new TypeOverrideManager();
     manager.enterScope();
     manager.exitScope();
     try {
       manager.exitScope();
       fail("Expected IllegalStateException");
-    } on IllegalStateException catch (exception) {
+    } on IllegalStateException {
       // Expected
     }
   }
 
   void test_exitScope_twoScopes() {
     TypeOverrideManager manager = new TypeOverrideManager();
     manager.enterScope();
     manager.exitScope();
     manager.enterScope();
     manager.exitScope();
     try {
       manager.exitScope();
       fail("Expected IllegalStateException");
-    } on IllegalStateException catch (exception) {
+    } on IllegalStateException {
       // Expected
     }
   }
 
   void test_getType_enclosedOverride() {
     TypeOverrideManager manager = new TypeOverrideManager();
     LocalVariableElementImpl element =
         ElementFactory.localVariableElement2("v");
     InterfaceType type = ElementFactory.classElement2("C").type;
     manager.enterScope();
@@ skipping 2150 matching lines @@
         // check propagated type
         FunctionType propagatedType = node.propagatedType as FunctionType;
         expect(propagatedType.returnType, test.typeProvider.stringType);
       } on AnalysisException catch (e, stackTrace) {
         thrownException[0] = new CaughtException(e, stackTrace);
       }
     }
     return null;
   }
 }