Vendor things

third-party/vendor/tracing/tests/scoped_clobbers_default.rs

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+#![cfg(feature = "std")]
+use tracing_mock::*;
+
+#[test]
+fn scoped_clobbers_global() {
+    // Reproduces https://github.com/tokio-rs/tracing/issues/2050
+
+    let (scoped, scoped_handle) = subscriber::mock()
+        .event(event::msg("before global"))
+        .event(event::msg("before drop"))
+        .only()
+        .run_with_handle();
+
+    let (global, global_handle) = subscriber::mock()
+        .event(event::msg("after drop"))
+        .only()
+        .run_with_handle();
+
+    // Set a scoped default subscriber, returning a guard.
+    let guard = tracing::subscriber::set_default(scoped);
+    tracing::info!("before global");
+
+    // Now, set the global default.
+    tracing::subscriber::set_global_default(global)
+        .expect("global default should not already be set");
+    // This event should still be collected by the scoped default.
+    tracing::info!("before drop");
+
+    // Drop the guard. Now, the global default subscriber should be used.
+    drop(guard);
+    tracing::info!("after drop");
+
+    scoped_handle.assert_finished();
+    global_handle.assert_finished();
+}