fixes #221, initial sync*, async, async* implementation

lib/src/info.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.
 
 /// Defines static information collected by the type checker and used later by
 /// emitters to generate code.
 library dev_compiler.src.info;
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
@@ skipping 73 matching lines @@
   }
 
   @override
   List cloneNodeList(List list) {
     var clone = super.cloneNodeList(list);
     for (int i = 0, len = list.length; i < len; i++) {
       _cloneProperties(clone[i], list[i]);
     }
     return clone;
   }
+
+  // TODO(jmesserly): as a workaround for analyzer <0.26.0-alpha.1.
+  // ResolutionCopier won't copy the type, so we do it here.
+  @override
+  AwaitExpression visitAwaitExpression(AwaitExpression node) {
+    var clone = super.visitAwaitExpression(node);
+    clone.staticType = node.staticType;
+    clone.propagatedType = node.propagatedType;
+    return clone;
+  }
 }
 
 // The abstract type of coercions mapping one type to another.
 // This class also exposes static builder functions which
 // check for errors and reduce redundant coercions to the identity.
 abstract class Coercion {
   final DartType fromType;
   final DartType toType;
   Coercion(this.fromType, this.toType);
   static Coercion cast(DartType fromT, DartType toT) => new Cast(fromT, toT);
@@ skipping 468 matching lines @@
 /// Better to have `super` at the end, as required by the Dart style guide:
 /// <http://goo.gl/q1T4BB>
 ///
 /// For now this is the only pattern we support.
 class InvalidSuperInvocation extends StaticError {
   InvalidSuperInvocation(SuperConstructorInvocation node) : super(node);
 
   @override String get message => "super call must be last in an initializer "
       "list (see http://goo.gl/q1T4BB): {0}";
 }