ensure BuildError impls std::error::Error
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Some usage in tracing expects this impl, as mentioned here: <tokio-rs/tracing#3033 (review)> It's provided when `regex-automata` has its `std` feature enabled. As `matchers` uses `std` itself, no reason not to allow `regex-automata` to do so also. Seems like the most straightforward way to address the problem: * avoids the need to create a wrapper type. * less fragile than bumping `tracing-subscriber`'s `regex` dependency to 1.9.0 and hoping that all semver-compatible versions will continue depending on `regex-automata` with this `std` feature enabled.
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Some usage in tracing expects this impl, as mentioned here: tokio-rs/tracing#3033 (review) It's provided when
regex-automatahas itsstdfeature enabled. Asmatchersusesstditself, no reason not to allowregex-automatato do so also. Seems like the most straightforward way to address the problem:tracing-subscriber'sregexdependency to 1.9.0 and hoping that all semver-compatible versions will continue depending onregex-automatawith thisstdfeature enabled.