Add support for serializing 'target[index]' expressions.

pkg/analyzer/test/src/summary/summary_common.dart

 // Copyright (c) 2015, 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.test.src.summary.summary_common;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/dart/scanner/reader.dart';
@@ skipping 5868 matching lines @@
       0,
       0
     ], strings: [
       'f'
     ], referenceValidators: [
       (EntityRef r) => checkTypeRef(r, null, null, 'C',
           expectedKind: ReferenceKind.classOrEnum)
     ]);
   }
 
+  test_expr_extractIndex_ofClassField() {
+    if (skipNonConstInitializers) {
+      return;
+    }
+    UnlinkedVariable variable = serializeVariableText('''
+class C {
+  List<int> get items => null;
+}
+final v = new C().items[5];
+''');
+    _assertUnlinkedConst(variable.constExpr, operators: [
+      UnlinkedConstOperation.invokeConstructor,
+      UnlinkedConstOperation.extractProperty,
+      UnlinkedConstOperation.pushInt,
+      UnlinkedConstOperation.extractIndex,
+    ], ints: [
+      0,
+      0,
+      5
+    ], strings: [
+      'items'
+    ], referenceValidators: [
+      (EntityRef r) => checkTypeRef(r, null, null, 'C',
+          expectedKind: ReferenceKind.classOrEnum)
+    ]);
+  }
+
   test_field() {
     UnlinkedClass cls = serializeClassText('class C { int i; }');
     UnlinkedVariable variable = findVariable('i', variables: cls.fields);
     expect(variable, isNotNull);
     expect(variable.isConst, isFalse);
     expect(variable.isStatic, isFalse);
     expect(variable.isFinal, isFalse);
     expect(variable.constExpr, isNull);
     expect(findExecutable('i', executables: cls.executables), isNull);
     expect(findExecutable('i=', executables: cls.executables), isNull);
@@ skipping 2485 matching lines @@
 class _PrefixExpectation {
   final ReferenceKind kind;
   final String name;
   final String absoluteUri;
   final String relativeUri;
   final int numTypeParameters;
 
   _PrefixExpectation(this.kind, this.name,
       {this.absoluteUri, this.relativeUri, this.numTypeParameters: 0});
 }