What trait bounds? These trait bounds

uhhhhhhh.rs

error[E0599]: no method named `for_each` found for type `std::boxed::Box<websocket::<unnamed>::Future<Error=websocket::WebSocketError, Item=(websocket::client::async::Framed<websocket::client::async::TlsStream<tokio_core::net::TcpStream>, websocket::async::MessageCodec<websocket::OwnedMessage>>, websocket::header::Headers)> + 'static>` in the current scope
  --> src/main.rs:31:10
   |
31 |         .for_each(|_| println!("test"));
   |          ^^^^^^^^
   |
   = note: the method `for_each` exists but the following trait bounds were not satisfied:
           `std::boxed::Box<websocket::<unnamed>::Future<Error=websocket::WebSocketError, Item=(websocket::client::async::Framed<websocket::client::async::TlsStream<tokio_core::net::TcpStream>, websocket::async::MessageCodec<websocket::OwnedMessage>>, websocket::header::Headers)>> : websocket::<unnamed>::Stream`
           `std::boxed::Box<websocket::<unnamed>::Future<Error=websocket::WebSocketError, Item=(websocket::client::async::Framed<websocket::client::async::TlsStream<tokio_core::net::TcpStream>, websocket::async::MessageCodec<websocket::OwnedMessage>>, websocket::header::Headers)>> : std::iter::Iterator`
           `&mut std::boxed::Box<websocket::<unnamed>::Future<Error=websocket::WebSocketError, Item=(websocket::client::async::Framed<websocket::client::async::TlsStream<tokio_core::net::TcpStream>, websocket::async::MessageCodec<websocket::OwnedMessage>>, websocket::header::Headers)> + 'static> : websocket::<unnamed>::Stream`
           `&mut std::boxed::Box<websocket::<unnamed>::Future<Error=websocket::WebSocketError, Item=(websocket::client::async::Framed<websocket::client::async::TlsStream<tokio_core::net::TcpStream>, websocket::async::MessageCodec<websocket::OwnedMessage>>, websocket::header::Headers)> + 'static> : std::iter::Iterator`
           `&mut websocket::<unnamed>::Future<Error=websocket::WebSocketError, Item=(websocket::client::async::Framed<websocket::client::async::TlsStream<tokio_core::net::TcpStream>, websocket::async::MessageCodec<websocket::OwnedMessage>>, websocket::header::Headers)> + 'static : websocket::<unnamed>::Stream`
           `&mut websocket::<unnamed>::Future<Error=websocket::WebSocketError, Item=(websocket::client::async::Framed<websocket::client::async::TlsStream<tokio_core::net::TcpStream>, websocket::async::MessageCodec<websocket::OwnedMessage>>, websocket::header::Headers)> + 'static : std::iter::Iterator`