Implement invoke, setField, and getField (unminified).

dart/sdk/lib/_internal/compiler/implementation/lib/js_rti.dart

 // Copyright (c) 2013, 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.
 
 part of _js_helper;
 
 setRuntimeTypeInfo(target, typeInfo) {
   assert(typeInfo == null || isJsArray(typeInfo));
   // We have to check for null because factories may return null.
   if (target != null) JS('var', r'#.$builtinTypeInfo = #', target, typeInfo);
 }
 
 getRuntimeTypeInfo(target) {
   if (target == null) return null;
   return JS('var', r'#.$builtinTypeInfo', target);
 }
 
 getRuntimeTypeArgument(target, substitution, index) {
   var arguments = substitute(substitution, getRuntimeTypeInfo(target));
   return (arguments == null) ? null : getField(arguments, index);
 }
 
 class TypeImpl implements Type {
-  final String typeName;
-  TypeImpl(this.typeName);
-  toString() => typeName;
-  int get hashCode => typeName.hashCode;
+  final String _typeName;
+
+  TypeImpl(this._typeName);
+
+  toString() => _typeName;
+
+  // TODO(ahe): This is a poor hashCode as it collides with its name.
+  int get hashCode => _typeName.hashCode;
+
   bool operator ==(other) {
-    if (other is !TypeImpl) return false;
-    return typeName == other.typeName;
+    return  (other is TypeImpl) && _typeName == other._typeName;
   }
 }
 
 String getClassName(var object) {
   return JS('String', r'#.constructor.builtin$cls', getInterceptor(object));
 }
 
 String getRuntimeTypeAsString(List runtimeType) {
   String className = getConstructorName(runtimeType[0]);
   return '$className${joinArguments(runtimeType, 1)}';
@@ skipping 194 matching lines @@
   // of [t].
   if ((!isJsArray(s) && JS('bool', '# == null', substitution)) ||
       !isJsArray(t)) {
     return true;
   }
   // Recursively check the type arguments.
   return checkArguments(substitution, getArguments(s), getArguments(t));
 }
 
 createRuntimeType(String name) => new TypeImpl(name);