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: handlers.rs
    path of file: ./repos/smithay/src/wayland/compositor
    
    the code of the file until where you have to start completion: use std::sync::{
    atomic::{AtomicBool, Ordering},
    Mutex,
};

use wayland_server::{
    protocol::{
        wl_callback::{self, WlCallback},
        wl_compositor::{self, WlCompositor},
        wl_region::{self, WlRegion},
        wl_subcompositor::{self, WlSubcompositor},
        wl_subsurface::{self, WlSubsurface},
        wl_surface::{self, WlSurface},
    },
    DataInit, Dispatch, DisplayHandle, GlobalDispatch, New, Resource, WEnum,
};

use crate::utils::{
    alive_tracker::{AliveTracker, IsAlive},
    Logical, Point,
};

use super::{
    cache::Cacheabl
    
    fn merge_into(self, into: &mut Self, _dh: &DisplayHandle) {
        if self.buffer.is_some() {
            if let Some(BufferAssignment::NewBuffer(buffer)) =
                std::mem::replace(&mut into.buffer, self.buffer)
            {
                let new_buffer = into.buffer.as_ref().and_then(|b| match b {
                    BufferAssignment::Removed => None,
                    BufferAssignment::NewBuffer(buffer) => Some(buffer),
                });

                if Some(&buffer) != new_buffer {
                    buffer.release();
                }
            }
        }
        into.buffer_delta = self.buffer_delta;
        into.buffer_scale = self.buffer_scale;
        into.buffer_transform = self.buffer_transform;
        into.damage.extend(self.damage);
        into.opaque_region = self.opaque_region;
        into.input_region = self.input_region;
        into.frame_callbacks.extend(self.frame_callbacks);
    }