use crate::upgradable::Upgrader;
pub trait TlsClientUpgrader<S>: Upgrader<S> {}
impl<S> TlsClientUpgrader<S> for () where S: Send + 'static {}
pub trait TlsServerUpgrader<S>: Upgrader<S> {}
impl<S> TlsServerUpgrader<S> for () where S: Send + 'static {}