Remove calls to `mem::forget` and `mem::replace` in `Option::get_or_insert_with`. This removes the unneeded calls to `mem::forget` and `mem::replace` in `Option::get_or_insert_with`.
Remove calls to `mem::forget` and `mem::replace` in `Option::get_or_insert_with`. This removes the unneeded calls to `mem::forget` and `mem::replace` in `Option::get_or_insert_with`.