You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: auto_local.rs
    path of file: ./repos/jni-rs/src/wrapper/objects
    
    the code of the file until where you have to start completion: use std::{
    mem::ManuallyDrop,
    ops::{Deref, DerefMut},
    ptr,
};

use crate::{objects::JObject, J
    
    fn drop(&mut self) {
        // Extract the local reference from `self.obj` so that we can delete it.
        //
        // This is needed because it is not allowed to move out of `self` during drop. A safe
        // alternative would be to wrap `self.obj` in `Option`, but that would incur a run-time
        // performance penalty from constantly checking if it's `None`.
        //
        // Safety: `self.obj` is not used again after this `take` call.
        let obj = unsafe { ManuallyDrop::take(&mut self.obj) };

        self.env.delete_local_ref(obj);
    }