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tracing-core 0.1.8

Core primitives for application-level tracing.
Documentation 
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use tracing_core::{metadata::Metadata, span, subscriber::Subscriber, Event};

pub struct TestSubscriberA;
impl Subscriber for TestSubscriberA {
    fn enabled(&self, _: &Metadata<'_>) -> bool {
        true
    }
    fn new_span(&self, _: &span::Attributes<'_>) -> span::Id {
        span::Id::from_u64(1)
    }
    fn record(&self, _: &span::Id, _: &span::Record<'_>) {}
    fn record_follows_from(&self, _: &span::Id, _: &span::Id) {}
    fn event(&self, _: &Event<'_>) {}
    fn enter(&self, _: &span::Id) {}
    fn exit(&self, _: &span::Id) {}
}
pub struct TestSubscriberB;
impl Subscriber for TestSubscriberB {
    fn enabled(&self, _: &Metadata<'_>) -> bool {
        true
    }
    fn new_span(&self, _: &span::Attributes<'_>) -> span::Id {
        span::Id::from_u64(1)
    }
    fn record(&self, _: &span::Id, _: &span::Record<'_>) {}
    fn record_follows_from(&self, _: &span::Id, _: &span::Id) {}
    fn event(&self, _: &Event<'_>) {}
    fn enter(&self, _: &span::Id) {}
    fn exit(&self, _: &span::Id) {}
}