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d2f47f1e3f
## Motivation Clippy check fails in recent CI runs in v0.1.x branch PRs, for example this run: https://github.com/tokio-rs/tracing/actions/runs/4641107803/jobs/8215263838 Relevant error logs: ``` error: lint `const_err` has been removed: converted into hard error, see issue #71800 <https://github.com/rust-lang/rust/issues/71800> for more information --> tracing-core/src/lib.rs:132:5 | 132 | const_err, | ^^^^^^^^^ | = note: `-D renamed-and-removed-lints` implied by `-D warnings` error: deref which would be done by auto-deref --> tracing-core/src/dispatcher.rs:371:26 | 371 | return f(&*entered.current()); | ^^^^^^^^^^^^^^^^^^^ help: try this: `&entered.current()` | = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_auto_deref = note: `-D clippy::explicit-auto-deref` implied by `-D warnings` error: deref which would be done by auto-deref --> tracing-core/src/dispatcher.rs:393:20 | 393 | Some(f(&*entered.current())) | ^^^^^^^^^^^^^^^^^^^ help: try this: `&entered.current()` | = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_auto_deref ``` ## Solution Fix the warnings based on the suggestions for Clippy.