Better error message for mixed type

[jakubkulhan]

class AnEntity
{
    /**garbage
     * @var int
     */
    protected $id;
}

Currently the message says "Property AnEntity::$id of type mixed. Either add @var, or @transient annotation." The user is confused, because there is @var annotation. The problem is caused by PHP not recognizing comment as doc comment. Error message should warn that there is no doc comment.