Infer membership should support Revealing Module Pattern

[carbonrobot]

Membership should be inferred when using the revealing module pattern.

/**
 * Calculator module
 */
function Calculator() {

    /**
     * Add two numbers
     * @param {number} x - The first number
     * @param {number} y - The second number
     * @returns The sum of the arguments
     */
    function add(x, y) {
        return x+y;
    }

    /**
     * Creates a magical unicorn
     * @private
     */
    function somethingPrivate(){
        // something
    }

    return {
        add: add
    };
}