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: wasm.rs
    path of file: ./repos/muddle-run/libs/client_lib/src/websocket
    
    the code of the file until where you have to start completion: use futures::{Sink, Stream};
use std::{
    pin::Pin,
    task::{Context, Poll},
};
use url::Url;
use ws_stream_wasm::{WsMessage as Message, WsMeta, WsStream};

impl From<Message> for super::Message {
    fn from
    
    fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
        let ws_stream = unsafe { self.map_unchecked_mut(|s| &mut s.ws_stream) };
        match ws_stream.poll_next(cx) {
            Poll::Ready(Some(item)) => Poll::Ready(Some(Ok(item.into()))),
            Poll::Ready(None) => Poll::Ready(None),
            Poll::Pending => Poll::Pending,
        }
    }