// @noEmit: true
// @allowJs: true
// @checkJs: true
// @Filename: a.js
// @strict: true

// non top-level:
// all references to _map, set, get, addon should be ok
(function container() {
    /** @constructor */
    var Multimap = function() {
        this._map = {};
        this._map
        this.set
        this.get
        this.addon
    };

    Multimap.prototype = {
        set: function() {
            this._map
            this.set
            this.get
            this.addon
        },
        get() {
            this._map
            this.set
            this.get
            this.addon
        }
    }

    Multimap.prototype.addon = function () {
        this._map
        this.set
        this.get
        this.addon
    }

    var mm = new Multimap();
    mm._map
    mm.set
    mm.get
    mm.addon
});