Naive handling of List#[] and List#[]=

tests/compiler/dart2js/mock_compiler.dart

 // Copyright (c) 2012, 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 mock_compiler;
 
 import 'dart:uri';
 
 import '../../../sdk/lib/_internal/compiler/compiler.dart' as api;
 import '../../../sdk/lib/_internal/compiler/implementation/elements/elements.dart';
@@ skipping 34 matching lines @@
   indexSet(a, index, value) {}
   makeLiteralMap(List keyValuePairs) {}
   setRuntimeTypeInfo(a, b) {}
   getRuntimeTypeInfo(a) {}
   stringTypeCheck(x) {}
   boolConversionCheck(x) {}
   abstract class JavaScriptIndexingBehavior {}
   class JSInvocationMirror {}
   S() {}
   assertHelper(a){}
-  throwNoSuchMethod(obj, name, arguments, expectedArgumentNames) {}''';
+  throwNoSuchMethod(obj, name, arguments, expectedArgumentNames) {}
+  throwAbstractClassInstantiationError(className) {}''';
 
 const String DEFAULT_INTERCEPTORSLIB = r'''
   class JSArray {
     var length;
     operator[](index) {}
     operator[]=(index, value) {}
     var add;
   }
   class JSString {
     var length;
@@ skipping 233 matching lines @@
   operator []=(Node node, Element element) {
     map[node] = element;
   }
 
   operator [](Node node) => map[node];
 
   void remove(Node node) {
     map.remove(node);
   }
 }