Fix compile error: Make IOV live longer (#163) #596

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3 errors and 4 warnings

The job was canceled because "ubuntu-latest_nightly" failed.

used `expect()` on `Err` value

The operation was canceled.

using `.deref()` on a double reference, which returns `&mut &mio::net::TcpStream` instead of dereferencing the inner type

using `.deref()` on a double reference, which returns `&mut &mio::net::TcpStream` instead of dereferencing the inner type

using `.deref()` on a double reference, which returns `&mut &mio::net::TcpStream` instead of dereferencing the inner type

using `.deref()` on a double reference, which returns `&mut &mio::net::TcpStream` instead of dereferencing the inner type