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 c13218e29793ac755ab70a9e6ed3082cfd61c8b2..eb55252a95903d41d2029c076ae9324af6c96e29 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);