When summarize AST, include local variables in loops and try-catch.

pkg/analyzer/lib/src/dart/element/builder.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 analyzer.src.dart.element.builder;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 352 matching lines @@
   @override
   Object visitCatchClause(CatchClause node) {
     SimpleIdentifier exceptionParameter = node.exceptionParameter;
     if (exceptionParameter != null) {
       // exception
       LocalVariableElementImpl exception =
           new LocalVariableElementImpl.forNode(exceptionParameter);
       if (node.exceptionType == null) {
         exception.hasImplicitType = true;
       }
+      exception.setVisibleRange(node.offset, node.length);
       _currentHolder.addLocalVariable(exception);
       exceptionParameter.staticElement = exception;
       // stack trace
       SimpleIdentifier stackTraceParameter = node.stackTraceParameter;
       if (stackTraceParameter != null) {
         LocalVariableElementImpl stackTrace =
             new LocalVariableElementImpl.forNode(stackTraceParameter);
         _setCodeRange(stackTrace, stackTraceParameter);
+        stackTrace.setVisibleRange(node.offset, node.length);
         _currentHolder.addLocalVariable(stackTrace);
         stackTraceParameter.staticElement = stackTrace;
       }
     }
     return super.visitCatchClause(node);
   }
 
   @override
   Object visitClassDeclaration(ClassDeclaration node) {
     ElementHolder holder = new ElementHolder();
@@ skipping 1105 matching lines @@
     return null;
   }
 
   /**
    * Return the lexical identifiers associated with the given [identifiers].
    */
   static List<String> _getIdentifiers(NodeList<SimpleIdentifier> identifiers) {
     return identifiers.map((identifier) => identifier.name).toList();
   }
 }