Fix for serializing cascades with not-assignment access to properties.

pkg/analyzer/lib/src/summary/summarize_const_expr.dart

 // Copyright (c) 2016, 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 serialization.summarize_const_expr;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/type.dart' show DartType;
 import 'package:analyzer/src/summary/format.dart';
@@ skipping 614 matching lines @@
     assignmentOperators.add(operator);
     _pushAssignable(operand);
   }
 
   void _serializePropertyAccess(PropertyAccess expr) {
     if (_isIdentifierSequence(expr)) {
       EntityRefBuilder ref = serializeIdentifierSequence(expr);
       references.add(ref);
       operations.add(UnlinkedExprOperation.pushReference);
     } else {
-      _serialize(expr.target);
+      if (!expr.isCascaded) {
+        _serialize(expr.target);
+      }
       strings.add(expr.propertyName.name);
       operations.add(UnlinkedExprOperation.extractProperty);
     }
   }
 
   void _serializeString(StringLiteral expr) {
     if (expr is AdjacentStrings) {
       if (expr.strings.every((string) => string is SimpleStringLiteral)) {
         operations.add(UnlinkedExprOperation.pushString);
         strings.add(expr.stringValue);
@@ skipping 24 matching lines @@
     if (typeArguments == null) {
       ints.add(0);
     } else {
       ints.add(typeArguments.arguments.length);
       for (TypeAnnotation type in typeArguments.arguments) {
         references.add(serializeTypeName(type));
       }
     }
   }
 }