Vendor dependencies for 0.3.0 release

vendor/tracing-core/tests/common/mod.rs

@@ -0,0 +1,30 @@
+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) {}
+}