Type annotations instead of closure comments.

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 0dea734d868b1611203d44eaae9f4041bafb21c8..68ca01fc0afdb8f79f61dd32b0d6a2e6493e758f 100644
--- a/lib/src/js/template.dart
+++ b/lib/src/js/template.dart
@@ -827,6 +827,33 @@ class InstantiatorGeneratorVisitor implements NodeVisitor<Instantiator> {
   Instantiator visitExportClause(ExportClause node) =>
       throw new UnimplementedError();
 
+  Instantiator visitAnyTypeRef(AnyTypeRef node) =>
+      throw new UnimplementedError();
+
+  Instantiator visitUnknownTypeRef(UnknownTypeRef node) =>
+      throw new UnimplementedError();
+
+  Instantiator visitArrayTypeRef(ArrayTypeRef node) =>
+      throw new UnimplementedError();
+
+  Instantiator visitFunctionTypeRef(FunctionTypeRef node) =>
+      throw new UnimplementedError();
+
+  Instantiator visitGenericTypeRef(GenericTypeRef node) =>
+      throw new UnimplementedError();
+
+  Instantiator visitQualifiedTypeRef(QualifiedTypeRef node) =>
+      throw new UnimplementedError();
+
+  Instantiator visitOptionalTypeRef(OptionalTypeRef node) =>
+      throw new UnimplementedError();
+
+  Instantiator visitRecordTypeRef(RecordTypeRef node) =>
+      throw new UnimplementedError();
+
+  Instantiator visitUnionTypeRef(UnionTypeRef node) =>
+      throw new UnimplementedError();
+
   @override
   Instantiator visitDestructuredVariable(DestructuredVariable node) {
     Instantiator makeName = visit(node.name);