@JavaScriptBody cannot handle props.render.@X call

[jtulach]

--- a/src/main/java/X.java
+++ b/src/main/java/X.java
@@ -47,7 +47,10 @@
     @JavaScriptBody(args = {"namespace", "name"}, javacall = true, body = "" +
             "namespace.__custom = namespace.__custom || {};\n" +
             "if (!namespace.__custom[name]) {\n" +
-            "    namespace.__custom[name] = function (props) { return props.render.@X::render()(); }\n" +
+            "    namespace.__custom[name] = function (props) {\n" +
+            "       let r = props.render;\n" +
+            "       return r.@X::render()();\n" +
+            "    }\n" +
             "\n}; " +
             "return namespace.__custom[name];\n")
     public static native Object customComponent(Object namespace, String name);