Tracking Issue for proc_macro::Span::{before, after} #87552
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Area: Procedural macros
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Category: A tracking issue for an RFC or an unstable feature.
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Nov 4, 2022
[](https://renovatebot.com) This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [Swatinem/rust-cache](https://togithub.com/Swatinem/rust-cache) | action | patch | `v2.0.0` -> `v2.0.2` | | [clap](https://togithub.com/clap-rs/clap) | dependencies | patch | `3.2.17` -> `3.2.23` | | [const_format](https://togithub.com/rodrimati1992/const_format_crates) | dependencies | patch | `0.2.26` -> `0.2.30` | | [darling](https://togithub.com/TedDriggs/darling) | dependencies | patch | `0.14.1` -> `0.14.2` | | [futures](https://rust-lang.github.io/futures-rs) ([source](https://togithub.com/rust-lang/futures-rs)) | dependencies | patch | `0.3.23` -> `0.3.25` | | [proc-macro2](https://togithub.com/dtolnay/proc-macro2) | dependencies | patch | `1.0.43` -> `1.0.47` | | [serde](https://serde.rs) ([source](https://togithub.com/serde-rs/serde)) | dependencies | patch | `1.0.144` -> `1.0.147` | | [serde_json](https://togithub.com/serde-rs/json) | dependencies | patch | `1.0.85` -> `1.0.87` | | [serde_yaml](https://togithub.com/dtolnay/serde-yaml) | dependencies | patch | `0.9.10` -> `0.9.14` | | [snafu](https://togithub.com/shepmaster/snafu) | dependencies | patch | `0.7.1` -> `0.7.3` | | [syn](https://togithub.com/dtolnay/syn) | dependencies | patch | `1.0.99` -> `1.0.103` | | [thiserror](https://togithub.com/dtolnay/thiserror) | dependencies | patch | `1.0.32` -> `1.0.37` | | [tokio](https://tokio.rs) ([source](https://togithub.com/tokio-rs/tokio)) | dependencies | patch | `1.21.1` -> `1.21.2` | | [tracing](https://tokio.rs) ([source](https://togithub.com/tokio-rs/tracing)) | dependencies | patch | `0.1.36` -> `0.1.37` | | [tracing-subscriber](https://tokio.rs) ([source](https://togithub.com/tokio-rs/tracing)) | dependencies | patch | `0.3.15` -> `0.3.16` | --- ### Release Notes <details> <summary>Swatinem/rust-cache</summary> ### [`v2.0.2`](https://togithub.com/Swatinem/rust-cache/releases/tag/v2.0.2) [Compare Source](https://togithub.com/Swatinem/rust-cache/compare/v2.0.1...v2.0.2) - Avoid calling cargo metadata on pre-cleanup. ### [`v2.0.1`](https://togithub.com/Swatinem/rust-cache/releases/tag/v2.0.1) [Compare Source](https://togithub.com/Swatinem/rust-cache/compare/v2.0.0...v2.0.1) - Primarily just updating dependencies to fix GitHub deprecation notices. </details> <details> <summary>clap-rs/clap</summary> ### [`v3.2.23`](https://togithub.com/clap-rs/clap/releases/tag/v3.2.23) [Compare Source](https://togithub.com/clap-rs/clap/compare/v3.2.22...v3.2.23) #### \[3.2.23] - 2022-10-24 ##### Fixes - Upgrade to `textwrap` 0.16 ### [`v3.2.22`](https://togithub.com/clap-rs/clap/releases/tag/v3.2.22) [Compare Source](https://togithub.com/clap-rs/clap/compare/v3.2.21...v3.2.22) ##### \[3.2.22] - 2022-09-16 ##### Fixes - Unify dependencies on `terminal_size` to the 0.2 release ### [`v3.2.21`](https://togithub.com/clap-rs/clap/releases/tag/v3.2.21) [Compare Source](https://togithub.com/clap-rs/clap/compare/v3.2.20...v3.2.21) #### \[3.2.21] - 2022-09-12 ##### Features - `TypedValueParser::map` to allow reusing existing value parsers for other purposes ### [`v3.2.20`](https://togithub.com/clap-rs/clap/releases/tag/v3.2.20) [Compare Source](https://togithub.com/clap-rs/clap/compare/v3.2.19...v3.2.20) #### \[3.2.20] - 2022-09-02 ##### Features - `ArgMatches::get_count` help for `ArgAction::Count` - `ArgMatches::get_flag` help for `ArgAction::SetTrue` / `ArgAction::SetFalse` ### [`v3.2.19`](https://togithub.com/clap-rs/clap/releases/tag/v3.2.19) [Compare Source](https://togithub.com/clap-rs/clap/compare/v3.2.18...v3.2.19) #### \[3.2.19] - 2022-08-30 ##### Fixes - *(help)* Ensure required arguments for parent commands aren't shown in their subcommands when using `args_conflicts_with_subcommand` ### [`v3.2.18`](https://togithub.com/clap-rs/clap/blob/HEAD/CHANGELOG.md#​3218---2022-08-29) [Compare Source](https://togithub.com/clap-rs/clap/compare/v3.2.17...v3.2.18) ##### Fixes - *(help)* `Command::print_help` now respects `Command::colored_help` - *(derive)* Improved error messages </details> <details> <summary>rodrimati1992/const_format_crates</summary> ### [`v0.2.29`](https://togithub.com/rodrimati1992/const_format_crates/blob/HEAD/Changelog.md#​0229) Added lowercase hexadecimal formatting support. Breaking: to add lowercase hexadecimal formatting, this crate changed the uppercase hexadecimal formatter from `{:x}` to `{:X}` ### [`v0.2.27`](https://togithub.com/rodrimati1992/const_format_crates/blob/HEAD/Changelog.md#​0227) Replacing existing features with these: - `"rust_1_64"`: superceeding the soft-deprecated `"more_str_macros"` feature. - `"rust_1_51"`: superceeding the soft-deprecated `"const_generics"` feature. The new features are enabled by the feature they superceede. Now the `"fmt"` feature enables the `"rust_1_64"` feature. </details> <details> <summary>TedDriggs/darling</summary> ### [`v0.14.2`](https://togithub.com/TedDriggs/darling/blob/HEAD/CHANGELOG.md#v0142-October-26-2022) [Compare Source](https://togithub.com/TedDriggs/darling/compare/v0.14.1...v0.14.2) - Derived impls of `FromMeta` will now error on literals, rather than silently ignoring them. [#​193](https://togithub.com/TedDriggs/darling/pull/193) - Don't include property paths in compile errors when spans are available. [#​203](https://togithub.com/TedDriggs/darling/pull/203) </details> <details> <summary>rust-lang/futures-rs</summary> ### [`v0.3.25`](https://togithub.com/rust-lang/futures-rs/blob/HEAD/CHANGELOG.md#​0325---2022-10-20) [Compare Source](https://togithub.com/rust-lang/futures-rs/compare/0.3.24...0.3.25) - Fix soundness issue in `join!` and `try_join!` macros ([#​2649](https://togithub.com/rust-lang/futures-rs/issues/2649)) - Implement `Clone` for `sink::Drain` ([#​2650](https://togithub.com/rust-lang/futures-rs/issues/2650)) ### [`v0.3.24`](https://togithub.com/rust-lang/futures-rs/blob/HEAD/CHANGELOG.md#​0324---2022-08-29) [Compare Source](https://togithub.com/rust-lang/futures-rs/compare/0.3.23...0.3.24) - Fix incorrect termination of `select_with_strategy` streams ([#​2635](https://togithub.com/rust-lang/futures-rs/issues/2635)) </details> <details> <summary>dtolnay/proc-macro2</summary> ### [`v1.0.47`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.47) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.46...1.0.47) - Fix integer overflow when nesting depth of nested comments exceeds 4 billion ([#​357](https://togithub.com/dtolnay/proc-macro2/issues/357)) ### [`v1.0.46`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.46) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.45...1.0.46) - Make proc_macro2::TokenStream's `FromStr` impl consistent with proc_macro::TokenStream's on strings that begin with a byte order mark `\u{feff}` ([#​353](https://togithub.com/dtolnay/proc-macro2/issues/353)) ### [`v1.0.45`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.45) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.44...1.0.45) - Fix panic on parsing disallowed raw identifiers such as `r#self` ([#​351](https://togithub.com/dtolnay/proc-macro2/issues/351)) ### [`v1.0.44`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.44) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.43...1.0.44) - Expose `span.before()` and `span.after()` to access an empty `Span` located immediately before or after the input span ([#​348](https://togithub.com/dtolnay/proc-macro2/issues/348), upstream tracking issue: [rust-lang/rust#87552) </details> <details> <summary>serde-rs/serde</summary> ### [`v1.0.147`](https://togithub.com/serde-rs/serde/releases/tag/v1.0.147) [Compare Source](https://togithub.com/serde-rs/serde/compare/v1.0.146...v1.0.147) - Add `serde::de::value::EnumAccessDeserializer` which transforms an `EnumAccess` into a `Deserializer` ([#​2305](https://togithub.com/serde-rs/serde/issues/2305)) ### [`v1.0.146`](https://togithub.com/serde-rs/serde/releases/tag/v1.0.146) [Compare Source](https://togithub.com/serde-rs/serde/compare/v1.0.145...v1.0.146) - Allow internally tagged newtype variant to contain unit ([#​2303](https://togithub.com/serde-rs/serde/issues/2303), thanks [@​tage64](https://togithub.com/tage64)) ### [`v1.0.145`](https://togithub.com/serde-rs/serde/releases/tag/v1.0.145) [Compare Source](https://togithub.com/serde-rs/serde/compare/v1.0.144...v1.0.145) - Allow RefCell\<T>, Mutex\<T>, and RwLock\<T> to be serialized regardless of whether T is `Sized` ([#​2282](https://togithub.com/serde-rs/serde/issues/2282), thanks [@​ChayimFriedman2](https://togithub.com/ChayimFriedman2)) </details> <details> <summary>serde-rs/json</summary> ### [`v1.0.87`](https://togithub.com/serde-rs/json/releases/tag/v1.0.87) [Compare Source](https://togithub.com/serde-rs/json/compare/v1.0.86...v1.0.87) - Add `write_i128` and `write_u128` methods to `serde_json::Formatter` to control the formatting of 128-bit integers ([#​940](https://togithub.com/serde-rs/json/issues/940), thanks [@​Lucretiel](https://togithub.com/Lucretiel)) ### [`v1.0.86`](https://togithub.com/serde-rs/json/releases/tag/v1.0.86) [Compare Source](https://togithub.com/serde-rs/json/compare/v1.0.85...v1.0.86) - Support `arbitrary_precision` feature even in no-std mode ([#​928](https://togithub.com/serde-rs/json/issues/928), thanks [@​kvinwang](https://togithub.com/kvinwang)) </details> <details> <summary>dtolnay/serde-yaml</summary> ### [`v0.9.14`](https://togithub.com/dtolnay/serde-yaml/releases/tag/0.9.14) [Compare Source](https://togithub.com/dtolnay/serde-yaml/compare/0.9.13...0.9.14) - Implement `Deserializer` for `TaggedValue` and `&TaggedValue` ([#​339](https://togithub.com/dtolnay/serde-yaml/issues/339)) ### [`v0.9.13`](https://togithub.com/dtolnay/serde-yaml/releases/tag/0.9.13) [Compare Source](https://togithub.com/dtolnay/serde-yaml/compare/0.9.12...0.9.13) - Recognize `True`, `TRUE`, `False`, `FALSE` as booleans, `Null`, `NULL` as null ([#​330](https://togithub.com/dtolnay/serde-yaml/issues/330)) ### [`v0.9.12`](https://togithub.com/dtolnay/serde-yaml/releases/tag/0.9.12) [Compare Source](https://togithub.com/dtolnay/serde-yaml/compare/0.9.11...0.9.12) - Support deserializing tagged literal scalar into primitive ([#​327](https://togithub.com/dtolnay/serde-yaml/issues/327)) ```yaml "foo": !!int |- 7200 ``` ### [`v0.9.11`](https://togithub.com/dtolnay/serde-yaml/releases/tag/0.9.11) [Compare Source](https://togithub.com/dtolnay/serde-yaml/compare/0.9.10...0.9.11) - Serialize strings on a single line when they do not already contain a newline character, regardless of string length ([#​321](https://togithub.com/dtolnay/serde-yaml/issues/321), [#​322](https://togithub.com/dtolnay/serde-yaml/issues/322)) </details> <details> <summary>shepmaster/snafu</summary> ### [`v0.7.3`](https://togithub.com/shepmaster/snafu/blob/HEAD/CHANGELOG.md#​073---2022-10-20) [Compare Source](https://togithub.com/shepmaster/snafu/compare/0.7.2...0.7.3) ##### Fixed - The macro no longer generates invalid code when implicitly-generated types (such as backtraces) were used in conjunction with `#[snafu(source(from))]` and the type before transformation does not implement `std::error::Error`. [0.7.3]: https://togithub.com/shepmaster/snafu/releases/tag/0.7.3 ### [`v0.7.2`](https://togithub.com/shepmaster/snafu/blob/HEAD/CHANGELOG.md#​072---2022-10-09) [Compare Source](https://togithub.com/shepmaster/snafu/compare/0.7.1...0.7.2) ##### Added - `Report` can be returned from `main` or test functions to provide a user-friendly display of errors. - A cheat sheet for the most common `#[snafu(...)]` attribute usages has been added to the `Snafu` macro's documentation. - Optional support for using the standard library's `std::backtrace::Backtrace` type via the `backtraces-impl-std` feature flag. - Optional support for implementing the Provider API using the `std::error::Error::provide` method via the `unstable-provider-api` feature flag. - Optional support for implementing the `core::error::Error` trait instead of `std::error::Error` via the `unstable-core-error` feature flag. - `GenerateImplicitData` has a new method `generate_with_source`. ##### Changed - `ErrorCompat::iter_chain` and `ChainCompat` are now available in no_std environments. - `ChainCompat` now implements `Clone`. - The `Debug` implementation for `Location` no longer shows some irrelevant internal details. [0.7.2]: https://togithub.com/shepmaster/snafu/releases/tag/0.7.2 </details> <details> <summary>dtolnay/syn</summary> ### [`v1.0.103`](https://togithub.com/dtolnay/syn/releases/tag/1.0.103) [Compare Source](https://togithub.com/dtolnay/syn/compare/1.0.102...1.0.103) - Implement `PartialOrd` for `Cursor` ([#​1236](https://togithub.com/dtolnay/syn/issues/1236), [#​1237](https://togithub.com/dtolnay/syn/issues/1237), thanks [@​CAD97](https://togithub.com/CAD97)) ### [`v1.0.102`](https://togithub.com/dtolnay/syn/releases/tag/1.0.102) [Compare Source](https://togithub.com/dtolnay/syn/compare/1.0.101...1.0.102) - More efficient internal representation for `TokenBuffer` ([#​1223](https://togithub.com/dtolnay/syn/issues/1223), thanks [@​CAD97](https://togithub.com/CAD97)) - Fix parsing of a left shift after macro metavariable in type position ([#​1229](https://togithub.com/dtolnay/syn/issues/1229)) ### [`v1.0.101`](https://togithub.com/dtolnay/syn/releases/tag/1.0.101) [Compare Source](https://togithub.com/dtolnay/syn/compare/1.0.100...1.0.101) - Eliminate a bunch of redundant work done by LitStr::parse ([#​1221](https://togithub.com/dtolnay/syn/issues/1221)) ### [`v1.0.100`](https://togithub.com/dtolnay/syn/releases/tag/1.0.100) [Compare Source](https://togithub.com/dtolnay/syn/compare/1.0.99...1.0.100) - Parse closures with explicit empty lifetime parameter list `for<> || -> T {…}` ([#​1212](https://togithub.com/dtolnay/syn/issues/1212), [rust-lang/rust#97362) - Parse `dyn*` provisional syntax ([#​1213](https://togithub.com/dtolnay/syn/issues/1213), [rust-lang/rust#91611) - Parse attributes on the "rest" pattern of a struct in pattern position, `Struct { #[attr] .. }` ([#​1214](https://togithub.com/dtolnay/syn/issues/1214)) - Parse `static async` and `static async move` closures ([#​1215](https://togithub.com/dtolnay/syn/issues/1215), [rust-lang/rust#62290) </details> <details> <summary>dtolnay/thiserror</summary> ### [`v1.0.37`](https://togithub.com/dtolnay/thiserror/releases/tag/1.0.37) [Compare Source](https://togithub.com/dtolnay/thiserror/compare/1.0.36...1.0.37) - Documentation improvements ### [`v1.0.36`](https://togithub.com/dtolnay/thiserror/releases/tag/1.0.36) [Compare Source](https://togithub.com/dtolnay/thiserror/compare/1.0.35...1.0.36) - Documentation improvements ([#​195](https://togithub.com/dtolnay/thiserror/issues/195), thanks [@​matklad](https://togithub.com/matklad)) ### [`v1.0.35`](https://togithub.com/dtolnay/thiserror/releases/tag/1.0.35) [Compare Source](https://togithub.com/dtolnay/thiserror/compare/1.0.34...1.0.35) - More work on integrating [std::any::Provider](https://doc.rust-lang.org/std/any/trait.Provider.html) for backtrace support - Fix *"Multiple applicable `provide` methods in scope"* error when the caller has both std::error::Error and std::any::Provide traits in scope ([#​185](https://togithub.com/dtolnay/thiserror/issues/185)) ### [`v1.0.34`](https://togithub.com/dtolnay/thiserror/releases/tag/1.0.34) [Compare Source](https://togithub.com/dtolnay/thiserror/compare/1.0.33...1.0.34) - Tweak "generic member access" based Backtrace implementation ([#​184](https://togithub.com/dtolnay/thiserror/issues/184)) ### [`v1.0.33`](https://togithub.com/dtolnay/thiserror/releases/tag/1.0.33) [Compare Source](https://togithub.com/dtolnay/thiserror/compare/1.0.32...1.0.33) - Expose backtraces via the new "generic member access" API on the Error trait ([rust-lang/rust#99301, [rust-lang/rust#96024) </details> <details> <summary>tokio-rs/tokio</summary> ### [`v1.21.2`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.21.2) [Compare Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.21.1...tokio-1.21.2) ### 1.21.2 (September 27, 2022) This release removes the dependency on the `once_cell` crate to restore the MSRV of 1.21.x, which is the latest minor version at the time of release. ([#​5048]) [#​5048]: https://togithub.com/tokio-rs/tokio/pull/5048 </details> <details> <summary>tokio-rs/tracing</summary> ### [`v0.1.37`](https://togithub.com/tokio-rs/tracing/releases/tag/tracing-0.1.37) [Compare Source](https://togithub.com/tokio-rs/tracing/compare/tracing-0.1.36...tracing-0.1.37) This release of `tracing` incorporates changes from `tracing-core` [v0.1.30][core-0.1.30] and `tracing-attributes` [v0.1.23][attrs-0.1.23], including the new `Subscriber::on_register_dispatch` method for performing late initialization after a `Subscriber` is registered as a `Dispatch`, and bugfixes for the `#[instrument]` attribute. Additionally, it fixes instances of the `bare_trait_objects` lint, which is now a warning on `tracing`'s MSRV and will become an error in the next edition. ##### Fixed - **attributes**: Incorrect handling of inner attributes in `#[instrument]`ed functions ([#​2307]) - **attributes**: Incorrect location of compiler diagnostic spans generated for type errors in `#[instrument]`ed `async fn`s ([#​2270]) - **attributes**: Updated `syn` dependency to fix compilation with `-Z minimal-versions` ([#​2246]) - `bare_trait_objects` warning in `valueset!` macro expansion ([#​2308]) ##### Added - **core**: `Subscriber::on_register_dispatch` method ([#​2269]) - **core**: `WeakDispatch` type and `Dispatch::downgrade()` function ([#​2293]) ##### Changed - `tracing-core`: updated to [0.1.30][core-0.1.30] - `tracing-attributes`: updated to [0.1.23][attrs-0.1.23] ##### Documented - Added [`tracing-web`][tracing-web] and [`reqwest-tracing`][reqwest-tracing] to related crates ([#​2283], [#​2331]) Thanks to new contributors [@​compiler-errors](https://togithub.com/compiler-errors), [@​e-nomem](https://togithub.com/e-nomem), [@​WorldSEnder](https://togithub.com/WorldSEnder), [@​Xiami2012](https://togithub.com/Xiami2012), and [@​tl-rodrigo-gryzinski](https://togithub.com/tl-rodrigo-gryzinski), as well as [@​jswrenn](https://togithub.com/jswrenn) and [@​CAD97](https://togithub.com/CAD97), for contributing to this release! [core-0.1.30]: https://togithub.com/tokio-rs/tracing/releases/tag/tracing-core-0.1.30 [attrs-0.1.23]: https://togithub.com/tokio-rs/tracing/releases/tag/tracing-attributes-0.1.23 [`tracing-web`]: https://crates.io/crates/tracing-web/ [`reqwest-tracing`]: https://crates.io/crates/reqwest-tracing/ [#​2246]: https://togithub.com/tokio-rs/tracing/pull/2246 [#​2269]: https://togithub.com/tokio-rs/tracing/pull/2269 [#​2283]: https://togithub.com/tokio-rs/tracing/pull/2283 [#​2270]: https://togithub.com/tokio-rs/tracing/pull/2270 [#​2293]: https://togithub.com/tokio-rs/tracing/pull/2293 [#​2307]: https://togithub.com/tokio-rs/tracing/pull/2307 [#​2308]: https://togithub.com/tokio-rs/tracing/pull/2308 [#​2331]: https://togithub.com/tokio-rs/tracing/pull/2331 </details> --- ### Configuration 📅 **Schedule**: Branch creation - "after 5:00 and before 6:00 every weekday" in timezone Europe/Berlin, Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. 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Feature gate:
#![feature(proc_macro_span_shrink)]This feature adds
span.before()andspan.after()which give empty spans right at the start and end of the span. (Just likeshrink_to_lo()andshrink_to_hi()inside rustc.)Public API
Steps / History
startandend: Implement proposed API forproc_macro_span#111571proc_macro::Spaninspection APIs #54725Unresolved Questions
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