array assignment losing flow type

[jlchmura]

in the sample below, weapons->attack() should resolve the attack call expression, but cannot because weapons is seen as an untyped object.

test() {    
    object *weapons;
    weapons = get_weaps();

    weapons->attack();
    foreach(object w in weapons) {        
        w->attack();        
    }
} 

/**
 * @returns {"obj/weapon"*} weapons
 */
object *get_weaps() {
    return ({ });
}