You are right. Damn. And this means we have no "real appender" in *Phobos*. By "real" I mean the one which will generate an array without copying. E.g. we may want to make an array of non-copyable objects. The function is `@trusted` for now as it implemented. Lots of `Appender` functions will finally depend on `T` so this change is just "make it such for now".