core: impl Value for dyn Error + Send/Sync
#2066
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hawkw
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Apr 11, 2022
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Thanks, this looks good to me.
In general, it's a lot easier if we make changes that apply to both the master and v0.1.x branches on the master branch, and then backport them to v0.1.x when the change applies to both v0.1.x and v0.2. It's a bit more work to have to backport and forward-port changes. Would you mind changing this PR to be based on master, and I'll handle backporting it after it merges?
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Ok. I wasn't sure how best to handle that. I'll rebase it onto |
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Oh good, GitHub appears to be rather confused by me force-pushing and then changing the base >_< I'll try again. |
`Value` was already implemented for `dyn Error + 'static`, but rust doesn't silently coerce trait objects. This means that passing an error of type `dyn Error + Send + Sync + 'static` would not work. These extra impls just delegate to the existing `dyn Error + 'static` impl. Also update one of the examples to use `dyn Error + Send + Sync` to demonstrate that this works. Refs: tokio-rs#1308
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hawkw
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Apr 11, 2022
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Apr 12, 2022
## Motivation `Value` was already implemented for `dyn Error + 'static`, but rust doesn't silently coerce trait objects. This means that passing an error of type `dyn Error + Send + Sync + 'static` would not work. This is related to #1308. ## Solution Add impls for `dyn Error + …` variants for `Send`, `Sync`, and `Send + Sync`. These extra impls just delegate to the existing `dyn Error + 'static` impl. Also update one of the examples to use `dyn Error + Send + Sync` to demonstrate that this works. Refs: #1308
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# 0.1.25 (April 12, 2022) This release adds additional `Value` implementations for `std::error::Error` trait objects with auto trait bounds (`Send` and `Sync`), as Rust will not auto-coerce trait objects. Additionally, it fixes a bug when setting scoped dispatchers that was introduced in the previous release ([v0.1.24]). ### Added - `Value` implementations for `dyn Error + Send + 'static`, `dyn Error + Send + Sync + 'static`, `dyn Error + Sync + 'static` ([#2066]) ### Fixed - Failure to use the global default dispatcher if a thread has set a scoped default prior to setting the global default, and unset the scoped default after setting the global default ([#2065]) Thanks to @lilyball for contributing to this release! [v0.1.24]: https://github.com/tokio-rs/tracing/releases/tag/tracing-core-0.1.24 [#2066]: #2066 [#2065]: #2065
hawkw
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# 0.1.25 (April 12, 2022) This release adds additional `Value` implementations for `std::error::Error` trait objects with auto trait bounds (`Send` and `Sync`), as Rust will not auto-coerce trait objects. Additionally, it fixes a bug when setting scoped dispatchers that was introduced in the previous release ([v0.1.24]). ### Added - `Value` implementations for `dyn Error + Send + 'static`, `dyn Error + Send + Sync + 'static`, `dyn Error + Sync + 'static` ([#2066]) ### Fixed - Failure to use the global default dispatcher if a thread has set a scoped default prior to setting the global default, and unset the scoped default after setting the global default ([#2065]) Thanks to @lilyball for contributing to this release! [v0.1.24]: https://github.com/tokio-rs/tracing/releases/tag/tracing-core-0.1.24 [#2066]: #2066 [#2065]: #2065
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# 0.1.25 (April 12, 2022) This release adds additional `Value` implementations for `std::error::Error` trait objects with auto trait bounds (`Send` and `Sync`), as Rust will not auto-coerce trait objects. Additionally, it fixes a bug when setting scoped dispatchers that was introduced in the previous release ([v0.1.24]). ### Added - `Value` implementations for `dyn Error + Send + 'static`, `dyn Error + Send + Sync + 'static`, `dyn Error + Sync + 'static` ([tokio-rs#2066]) ### Fixed - Failure to use the global default dispatcher if a thread has set a scoped default prior to setting the global default, and unset the scoped default after setting the global default ([tokio-rs#2065]) Thanks to @lilyball for contributing to this release! [v0.1.24]: https://github.com/tokio-rs/tracing/releases/tag/tracing-core-0.1.24 [tokio-rs#2066]: tokio-rs#2066 [tokio-rs#2065]: tokio-rs#2065
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May 22, 2024
This commit adds a `Value` implementation for `Box<T> where T: Value`. This is *primarily* intended to make `Box<dyn Error + ...>` implement `Value`, building on the `Value` impls for `dyn Error + ...` added in tokio-rs#2066, but it may be useful for other boxed values as well. Refs: tokio-rs#1308
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Motivation
Valuewas already implemented fordyn Error + 'static, but rust doesn't silently coerce trait objects. This means that passing an error of typedyn Error + Send + Sync + 'staticwould not work. This is related to #1308.Solution
Add impls for
dyn Error + …variants forSend,Sync, andSend + Sync. These extra impls just delegate to the existingdyn Error + 'staticimpl.Also update one of the examples to use
dyn Error + Send + Syncto demonstrate that this works.