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: channel_read_fn.rs
    path of file: ./repos/mediasoup/rust/src/worker/utils
    
    the code of the file until where you have to start completion: pub(super) use mediasoup_sys::{ChannelReadCtx, ChannelReadFn};
use mediasoup_sys::{ChannelReadFreeFn, UvAsyncT};
use std::mem;
use std::os::raw::c_void;

unsafe extern "C" fn free
    
    pub(super) unsafe fn deconstruct(self) -> (ChannelReadFn, ChannelReadCtx, ChannelReadCallback) {
        let Self {
            channel_read_fn,
            channel_read_ctx,
            write_callback,
        } = self;
        (channel_read_fn, channel_read_ctx, write_callback)
    }