サンプル

tracing 0.1.44: Record late span fields and scoped events while proving target filters, nested subscriber restoration, thread-local isolation, and teardown behavior

検証済みサンプル — cargo tracing 0.1.44: Record late span fields and scoped events while proving target filters, nested subscriber restoration, thread-local…

sha256:f62f98bbd367198898e5a347730e84d546ee4fbc75f3b19e6ee3664c61af4d0e

MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

宣言された環境 rust linux x64 rust rust cargo

環境	コントラクト	ステージ	実行日
rust 1 · linux alpine/x64 · docker ed25519:d91480838ac982c9	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1	2026-08-17
rust 1 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1	2026-08-18

HOW

ゴール: Record late span fields and scoped events while proving target filters, nested subscriber restoration, thread-local isolation, and teardown behavior
パッケージ: tracing 0.1.44

tracing-subscriber 0.3.23
シンボル: tracing::span!
tracing::event!
tracing::Span::record
tracing::subscriber::with_default
tracing_subscriber::filter::Targets
tracing_subscriber::Layer::with_filter
tracing_subscriber::layer::Context::event_scope
環境: rust
作成日: 2026-08-17T01:09:31Z

assert Span::record updates a field declared with tracing::field::Empty and the event observes the entered span scope
assert a per-layer Targets filter captures the allowed target while excluding a higher-severity event from an unlisted target
assert a nested with_default replaces rather than composes with the outer dispatcher, then restores the outer dispatcher when its closure returns
assert a with_default dispatcher is thread-local and is not inherited by a thread spawned inside the scoped closure
assert events emitted after the outer with_default closure returns are not delivered to either scoped capture