initial sync*, part of #221

lib/src/js/template.dart

Index: lib/src/js/template.dart
diff --git a/lib/src/js/template.dart b/lib/src/js/template.dart
index 0c951a968d09456e7ae8a20d8a4ca635c895d14a..9d75530162f538078ca0ba1b19c2634aa8e9a011 100644
--- a/lib/src/js/template.dart
+++ b/lib/src/js/template.dart
@@ -642,6 +642,9 @@ class InstantiatorGeneratorVisitor implements NodeVisitor<Instantiator> {
   Instantiator visitSpread(Spread node) =>
       (args) => new Spread(visit(node.argument)(args));
 
+  Instantiator visitYield(Yield node) =>
+      (args) => new Yield(visit(node.value)(args), star: node.star);
+
   Instantiator visitRestParameter(RestParameter node) =>
       (args) => new RestParameter(visit(node.parameter)(args));