tokio 1.8.3

An event-driven, non-blocking I/O platform for writing asynchronous I/O backed applications.
Documentation 
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use std::future::Future;

pub(crate) trait InstrumentedFuture: Future {
    fn id(&self) -> Option<tracing::Id>;
}

impl<F: Future> InstrumentedFuture for tracing::instrument::Instrumented<F> {
    fn id(&self) -> Option<tracing::Id> {
        self.span().id()
    }
}