Fix hints in the analyzer package.

pkg/analyzer/test/generated/incremental_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.incremental_resolver_test;
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
@@ skipping 3789 matching lines @@
   void test_scopeFor_MethodDeclaration_body() {
     Scope scope = _scopeFor(_createResolvedMethodDeclaration().body);
     EngineTestCase.assertInstanceOf(
         (obj) => obj is FunctionScope, FunctionScope, scope);
   }
 
   void test_scopeFor_notInCompilationUnit() {
     try {
       _scopeFor(AstFactory.identifier3("x"));
       fail("Expected AnalysisException");
-    } on AnalysisException catch (exception) {
+    } on AnalysisException {
       // Expected
     }
   }
 
   void test_scopeFor_null() {
     try {
       _scopeFor(null);
       fail("Expected AnalysisException");
-    } on AnalysisException catch (exception) {
+    } on AnalysisException {
       // Expected
     }
   }
 
   void test_scopeFor_unresolved() {
     try {
       _scopeFor(AstFactory.compilationUnit());
       fail("Expected AnalysisException");
-    } on AnalysisException catch (exception) {
+    } on AnalysisException {
       // Expected
     }
   }
 
   ClassDeclaration _createResolvedClassDeclaration() {
     CompilationUnit unit = _createResolvedCompilationUnit();
     String className = "C";
     ClassDeclaration classNode = AstFactory.classDeclaration(
         null, className, AstFactory.typeParameterList(), null, null, null);
     unit.declarations.add(classNode);
@@ skipping 93 matching lines @@
     return ResolutionContextBuilder.contextFor(node, listener).scope;
   }
 }
 
 class _Edit {
   final int offset;
   final int length;
   final String replacement;
   _Edit(this.offset, this.length, this.replacement);
 }