macro_rules! try_desync(
    ($s:expr, $e:expr) => (
        match $e {
            Ok(ok) => ok,
            Err(err) => {
                $s.desynchronized = true;
                return Err(::std::error::FromError::from_error(err));
            }
        }
    )
)

macro_rules! check_desync(
    ($e:expr) => ({
        if $e.canary() != CANARY {
            panic!("Connection use after free. See mozilla/rust#13246.");
        }
        if $e.is_desynchronized() {
            return Err(::Error::StreamDesynchronized);
        }
    })
)

macro_rules! bad_response(
    ($s:expr) => ({
        debug!("Unexpected response");
        $s.desynchronized = true;
        return Err(::Error::BadResponse);
    })
)