Codes in Immediately-Invoked Function Expression, tags can't be generated

[zhifengle]

var foo = 1;
(function() {
let worker = {
  someMethod() {
    return 1;
  },

  slow(x) {
    console.log("Called with " + x);
    return x * this.someMethod(); // (*)
  }
};
}());

jsctags only can generate variable foo's tags.I make Immediately-Invoked Function Expression as commentary, jsctags would work fine.
My Nodejs version is 6.11.0, and jsctags version is 5.2.0.

Is it possible to take "iife" as an anonymous namespace ?