Don't escape U+FF9E and U+FF9F in `escape_debug_ext` by Jules-Bertholet · Pull Request #158057 · rust-lang/rust

Jules-Bertholet · 2026-06-18T01:51:36Z

The two characters ﾞ U+FF9E HALFWIDTH KATAKANA VOICED SOUND MARK and ﾟ U+FF9F HALFWIDTH KATAKANA SEMI-VOICED SOUND MARK are the odd ones out when it comes to grapheme extenders, in that graphically they are not combining at all. See microsoft/terminal#18087 for more background on these characters.

I think this needs FCP? It affects char::escape_debug, and various Debug impls for characters and strings.

@rustbot labels T-libs-api needs-fcp A-Unicode

rustbot · 2026-06-18T01:51:42Z

r? @Darksonn

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Darksonn · 2026-06-18T06:29:43Z

            _ if self.is_control()
                || self.is_private_use()
                || self.is_whitespace()
                || args.escape_grapheme_extender && self.is_grapheme_extender()
                || self.is_default_ignorable()
                || self.is_format_control()
                || self.is_unassigned() =>
            {
                EscapeDebug::unicode(self)


Which category does it fall into today? What sort of other things are in that category? It seems like a really weird exception, and I can't help but wonder whether it's one of these methods that should be fixed instead.

View changes since the review

They fall under is_grapheme_extender(). https://www.unicode.org/versions/latest/core-spec/chapter-3/#G41165 is the description of this category in the Unicode standard (which explicitly special-cases these two characters). https://util.unicode.org/UnicodeJsps/list-unicodeset.jsp?a=%5B%3AGrapheme_Extend%3A%5D is the full list of characters in the category

If I set escape_grapheme_extender, then I would expect it to escape all grapheme extenders.

I added a note to the field's doc comment.

Darksonn · 2026-06-18T06:31:22Z

Could you give an example of a string whose Debug impl changes? Perhaps add it as a test.

Jules-Bertholet · 2026-06-18T13:53:13Z

An example string that would be affected: "ﾍﾟﾝｷﾞﾝ" (Japanese "penguin" in half-width katakana) would previously debug-print as "ﾍ\u{ff9f}ﾝｷ\u{ff9e}ﾝ", but after this PR will print as itself.

Jules-Bertholet

I added a test.

View changes since this review

Darksonn

Well, with my somewhat limited but non-zero knowledge of japanese, I do agree that ﾍﾟﾝｷﾞﾝ should ideally be printed without escaping, and I also understand why it makes sense for them to be considered "part" of the current character even if they do not stack on top of the previous character.

So I'm going to review this PR with the assumption that we want to make this change now, but I do agree that an FCP would be ideal for this behavior change.

View changes since this review

Darksonn · 2026-06-19T20:22:31Z

cc @Amanieu can you help with whether FCP is needed? Thanks!

Amanieu · 2026-06-19T21:26:11Z

When in doubt, just add the label to nominate for discussion in the next libs-api meeting.

nia-e · 2026-06-23T17:05:35Z

cc @Manishearth as our Unicode Knower, if this seems reasonable to you we're okay shipping this

joshtriplett · 2026-06-23T17:06:08Z

@rfcbot merge libs-api

@rfcbot concern wait-for-manish-feedback

rust-rfcbot · 2026-06-23T17:06:24Z

@joshtriplett has proposed to merge this. The next step is review by the rest of the tagged team members:

Concerns:

~~wait-for-manish-feedback~~ resolved by Don't escape U+FF9E and U+FF9F in escape_debug_ext #158057 (comment)

Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

See this document for info about what commands tagged team members can give me.

the8472 · 2026-06-23T17:06:49Z

cc @Manishearth as our Unicode Knower, if this seems reasonable to you we're okay shipping this

And also, is there something we could get from the unicode consortium to make this less adhoc?

Jules-Bertholet · 2026-06-23T18:05:03Z

And also, is there something we could get from the unicode consortium to make this less adhoc?

I doubt it. It's debug output, there's not much use in a detailed standard for that.

Jules-Bertholet · 2026-07-30T00:43:36Z

@rustbot ready

Darksonn

@bors r+

View changes since this review

rust-bors · 2026-07-30T05:55:56Z

📋 This PR cannot be approved because it currently has the following label: S-waiting-on-fcp.

Darksonn · 2026-07-30T05:56:21Z

@bors r+

rust-bors · 2026-07-30T05:56:24Z

📌 Commit 4be2c44 has been approved by Darksonn

It is now in the queue for this repository.

@rustbot

…noescape, r=Darksonn Don't escape U+FF9E and U+FF9F in `escape_debug_ext` The two characters `ﾞ` U+FF9E HALFWIDTH KATAKANA VOICED SOUND MARK and `ﾟ` U+FF9F HALFWIDTH KATAKANA SEMI-VOICED SOUND MARK are the odd ones out when it comes to grapheme extenders, in that *graphically* they are not combining at all. See microsoft/terminal#18087 for more background on these characters. I think this needs FCP? It affects `char::escape_debug`, and various `Debug` impls for characters and strings. @rustbot labels T-libs-api needs-fcp A-Unicode

@rustbot

…noescape, r=Darksonn Don't escape U+FF9E and U+FF9F in `escape_debug_ext` The two characters `ﾞ` U+FF9E HALFWIDTH KATAKANA VOICED SOUND MARK and `ﾟ` U+FF9F HALFWIDTH KATAKANA SEMI-VOICED SOUND MARK are the odd ones out when it comes to grapheme extenders, in that *graphically* they are not combining at all. See microsoft/terminal#18087 for more background on these characters. I think this needs FCP? It affects `char::escape_debug`, and various `Debug` impls for characters and strings. @rustbot labels T-libs-api needs-fcp A-Unicode

…uwer Rollup of 8 pull requests Successful merges: - #159817 (Rename splat to avoid stable name collisions) - #158057 (Don't escape U+FF9E and U+FF9F in `escape_debug_ext`) - #159818 (Resolve vars before calling `unnormalized_obligations`) - #160040 (Split function parsing out of `item.rs` to a new module.) - #160044 (Add regression tests for fixed dead-code issues) - #160147 (tests: Remove `-Zthreads` options from tests in `ui/parallel-rustc`) - #160175 (Try to recover less from incorrectly parsed const arg) - #160181 (Mark `Tuple` and `FnPtr` traits `#[fundamental]`)

@rustbot

…noescape, r=Darksonn Don't escape U+FF9E and U+FF9F in `escape_debug_ext` The two characters `ﾞ` U+FF9E HALFWIDTH KATAKANA VOICED SOUND MARK and `ﾟ` U+FF9F HALFWIDTH KATAKANA SEMI-VOICED SOUND MARK are the odd ones out when it comes to grapheme extenders, in that *graphically* they are not combining at all. See microsoft/terminal#18087 for more background on these characters. I think this needs FCP? It affects `char::escape_debug`, and various `Debug` impls for characters and strings. @rustbot labels T-libs-api needs-fcp A-Unicode

Rollup of 14 pull requests Successful merges: - #159817 (Rename splat to avoid stable name collisions) - #160204 (Sync from portable simd 2026 07 30) - #150885 (Revive L4Re target) - #158057 (Don't escape U+FF9E and U+FF9F in `escape_debug_ext`) - #160125 (Fix typing mode handling in transmute checks and rustc_dump_layout) - #160152 (Create on-demand CI job for testing EC2 instances) - #159214 (std: improve the documentation of the random feature) - #159818 (Resolve vars before calling `unnormalized_obligations`) - #160040 (Split function parsing out of `item.rs` to a new module.) - #160044 (Add regression tests for fixed dead-code issues) - #160144 (renovate: group lockfiles PRs) - #160149 (Fix Windows on Arm PAC default) - #160175 (Try to recover less from incorrectly parsed const arg) - #160181 (Mark `Tuple` and `FnPtr` traits `#[fundamental]`)

…uwer Rollup of 25 pull requests Successful merges: - #160204 (Sync from portable simd 2026 07 30) - #138230 (Add `raw_borrows_via_references` lint) - #158057 (Don't escape U+FF9E and U+FF9F in `escape_debug_ext`) - #160015 (refactor(mir-transform): Merge `can_be_overridden`, `is_required` and `is_enabled` into one) - #160031 (std: make positioned I/O unsupported on VxWorks) - #160125 (Fix typing mode handling in transmute checks and rustc_dump_layout) - #160152 (Create on-demand CI job for testing EC2 instances) - #160232 (rustdoc: fix ICE when a grapheme cluster joins a Prepend-class character to `_` or `:`) - #159214 (std: improve the documentation of the random feature) - #159818 (Resolve vars before calling `unnormalized_obligations`) - #159955 (Stop using higher-order macros to declare arenas) - #159958 (Fix avoid cycle for self referential return type notation) - #160040 (Split function parsing out of `item.rs` to a new module.) - #160044 (Add regression tests for fixed dead-code issues) - #160144 (renovate: group lockfiles PRs) - #160149 (Fix Windows on Arm PAC default) - #160164 (Derive `GenericTypeVisitable` for `RegionConstraint`) - #160175 (Try to recover less from incorrectly parsed const arg) - #160177 (A few more "predicate"-to-"clause" renamings) - #160181 (Mark `Tuple` and `FnPtr` traits `#[fundamental]`) - #160192 (Fix ICE for parsing issue with a closing brace) - #160209 (bootstrap: Remove method `Subcommand::kind`) - #160221 (Remove `Copy` supertrait from `VaList`) - #160223 (interpret: rename validate_operand → validate_place) - #160234 (Always use short ty path for call with missing arguments suggestion)

@rustbot

Rollup merge of #158057 - Jules-Bertholet:halfwidth-dakuten-noescape, r=Darksonn Don't escape U+FF9E and U+FF9F in `escape_debug_ext` The two characters `ﾞ` U+FF9E HALFWIDTH KATAKANA VOICED SOUND MARK and `ﾟ` U+FF9F HALFWIDTH KATAKANA SEMI-VOICED SOUND MARK are the odd ones out when it comes to grapheme extenders, in that *graphically* they are not combining at all. See microsoft/terminal#18087 for more background on these characters. I think this needs FCP? It affects `char::escape_debug`, and various `Debug` impls for characters and strings. @rustbot labels T-libs-api needs-fcp A-Unicode

…uwer Rollup of 25 pull requests Successful merges: - rust-lang/rust#160204 (Sync from portable simd 2026 07 30) - rust-lang/rust#138230 (Add `raw_borrows_via_references` lint) - rust-lang/rust#158057 (Don't escape U+FF9E and U+FF9F in `escape_debug_ext`) - rust-lang/rust#160015 (refactor(mir-transform): Merge `can_be_overridden`, `is_required` and `is_enabled` into one) - rust-lang/rust#160031 (std: make positioned I/O unsupported on VxWorks) - rust-lang/rust#160125 (Fix typing mode handling in transmute checks and rustc_dump_layout) - rust-lang/rust#160152 (Create on-demand CI job for testing EC2 instances) - rust-lang/rust#160232 (rustdoc: fix ICE when a grapheme cluster joins a Prepend-class character to `_` or `:`) - rust-lang/rust#159214 (std: improve the documentation of the random feature) - rust-lang/rust#159818 (Resolve vars before calling `unnormalized_obligations`) - rust-lang/rust#159955 (Stop using higher-order macros to declare arenas) - rust-lang/rust#159958 (Fix avoid cycle for self referential return type notation) - rust-lang/rust#160040 (Split function parsing out of `item.rs` to a new module.) - rust-lang/rust#160044 (Add regression tests for fixed dead-code issues) - rust-lang/rust#160144 (renovate: group lockfiles PRs) - rust-lang/rust#160149 (Fix Windows on Arm PAC default) - rust-lang/rust#160164 (Derive `GenericTypeVisitable` for `RegionConstraint`) - rust-lang/rust#160175 (Try to recover less from incorrectly parsed const arg) - rust-lang/rust#160177 (A few more "predicate"-to-"clause" renamings) - rust-lang/rust#160181 (Mark `Tuple` and `FnPtr` traits `#[fundamental]`) - rust-lang/rust#160192 (Fix ICE for parsing issue with a closing brace) - rust-lang/rust#160209 (bootstrap: Remove method `Subcommand::kind`) - rust-lang/rust#160221 (Remove `Copy` supertrait from `VaList`) - rust-lang/rust#160223 (interpret: rename validate_operand → validate_place) - rust-lang/rust#160234 (Always use short ty path for call with missing arguments suggestion)

Pkgsrc changes: * Adapt to changes in vendored crate versions. * Version & checksum changes. Upstream changes: Version 1.99.0 (2026-10-01) ========================== Language -------- - [Add allow-by-default `raw_borrows_via_references` lint that checks for references that decay immediately into raw borrows](rust-lang/rust#138230) - [Extend `unconditional_panic` lint to function calls that panic when the chunks/windows size is zero] (rust-lang/rust#153563) - [Stabilize C-variadic function definitions] (rust-lang/rust#155697) - [Stabilize the ability to use `#[unsafe(naked)]` functions to define C-variadic functions (`#![feature(c_variadic_naked_functions)]`).] (rust-lang/rust#159746) - [Trait methods are now resolved on an adjusted never type (producing a FCW)] (rust-lang/rust#156047) - [Coerce from inference variables to trait objects if the inference variable is related via subtyping to a type that is known to be `Sized`] (rust-lang/rust#157820) - [Stabilize `#[my_macro] mod foo;`] (rust-lang/rust#157857). This allows outlined modules (`mod foo;`) anywhere in the body of a custom attribute or derive macro. - [Fix the `overflowing_literals` lint with repeated negation] (rust-lang/rust#158302). For instance, it will now no longer lint on `--128_i8`, which is already detected by the `arithmetic_overflow` lint. - [Add POSIX symbols to the `invalid_runtime_symbol_definitions` and `suspicious_runtime_symbol_definitions` lints] (rust-lang/rust#158522) - [Lint unused `#[path]` attributes on inline modules] (rust-lang/rust#158835) - [Enable `unreachable_cfg_select_predicates` lint as part of `unused` lint group] (rust-lang/rust#159179) - [Stabilize passing 128-bit integers via vector registers with `asm!` on x86] (rust-lang/rust#159525) - [Explicitly document that some allocations are allowed to grow in-place (but none are allowed to shrink)] (rust-lang/rust#159729) - We now [guarantee] (rust-lang/rust#159730) that the contents of an `UnsafeCell` can be accessed without going through `get` - [The `invalid_reference_casting` lint was adjusted accordingly] (rust-lang/rust#159960) - [Account for globally enabled target features in `global_asm!`] (rust-lang/rust#160594) - [Warn if an invalid `doc` attribute is used on a macro invocation] (rust-lang/rust#161003) Compiler -------- - [Convert `-Ctarget-cpu` into a target-modifier for AVR, AMDGCN and NVPTX] (rust-lang/rust#150732) - [Enable `static_position_independent_executables` on all gnu and musl targets] (rust-lang/rust#158510) - When providing a suggestion about a missing method, rustc now prefers an exactly matching name from a [doc alias attribute] (https://doc.rust-lang.org/rustdoc/advanced-features.html#add-aliases-for-an-item-in-documentation-search) over a similarity search from other method names. If your new users sometimes expect a method under a different name, adding a doc alias will now help them find it via rustc suggestions, in addition to helping them find it via rustdoc search: [When suggesting method names, prefer *exact* doc aliases over similar names](rust-lang/rust#160369) Platform Support ---------------- - [Promote `riscv64-unknown-linux-musl` to Tier 2 with host tools] (rust-lang/rust#158766) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. [platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html Libraries --------- - Iteration on `RangeInclusive` (`a..=b` ranges) is now [optimized better in some circumstances] (rust-lang/rust#155114). As a side effect of this, the behavior of `RangeInclusive` values that has already been exhausted (as an iterator) has changed. For example, the return values of `start()` and `end()` on such ranges may return different values, and using such ranges as slice indexes may have different behavior. These behaviors were not guaranteed to be stable, so these changes are considered to not be breaking changes. - [Relax `transmute_copy` to accept `?Sized` types] (rust-lang/rust#155989) - [Update `transmute_copy` to use a non-unwinding panic] (rust-lang/rust#155989) - [Don't escape U+FF9E and U+FF9F in `escape_debug_ext`] (rust-lang/rust#158057) - [Re-export `core::fmt::NumBuffer` in `alloc` (and `std`)] (rust-lang/rust#161430) Stabilized APIs --------------- - [`IntoIterator` for `Box<[T; N]>`] (https://doc.rust-lang.org/stable/std/iter/trait.IntoIterator.html#impl-IntoIterator-for-Box%3C%5BT;+N%5D,+A%3E) - [`IntoIterator` for `&Box<[T; N]>`] (https://doc.rust-lang.org/stable/std/iter/trait.IntoIterator.html#impl-IntoIterator-for-%26Box%3C%5BT;+N%5D,+A%3E) - [`IntoIterator` for `&mut Box<[T; N]>`] (https://doc.rust-lang.org/stable/std/iter/trait.IntoIterator.html#impl-IntoIterator-for-%26mut+Box%3C%5BT;+N%5D,+A%3E) - [`VecDeque::retain_back`] (https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_back) - [`core::ffi::VaList`] (https://doc.rust-lang.org/stable/core/ffi/struct.VaList.html) - [`Box::into_non_null`] (https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_non_null) - [`Box::from_non_null`] (https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.from_non_null) - [`Vec::into_parts`] (https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.into_parts) - [`Vec::from_parts`] (https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.from_parts) - [`core::mem::size_of_val_raw`] (https://doc.rust-lang.org/stable/core/mem/fn.size_of_val_raw.html) - [`core::mem::align_of_val_raw`] (https://doc.rust-lang.org/stable/core/mem/fn.align_of_val_raw.html) - [`core::alloc::Layout::for_value_raw`] (https://doc.rust-lang.org/stable/core/alloc/struct.Layout.html#method.for_value_raw) - [`String::from_utf8_lossy_owned`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf8_lossy_owned) - [`string::FromUtf8Error::into_utf8_lossy`] (https://doc.rust-lang.org/stable/std/string/struct.FromUtf8Error.html#method.into_utf8_lossy) - [`FusedIterator for StepBy<I>`] (https://doc.rust-lang.org/stable/std/iter/struct.StepBy.html#impl-FusedIterator-for-StepBy%3CI%3E) - [`std::fs::set_times`] (https://doc.rust-lang.org/stable/std/fs/fn.set_times.html) - [`std::fs::set_times_nofollow`] (https://doc.rust-lang.org/stable/std/fs/fn.set_times_nofollow.html) Cargo ----- - Add a new built-in profile `debug`. This is a preparation for transitioning the `dev` profile away from debugging to give a saner default for faster development iterations. Currently there is no difference between `dev` and `debug` profiles. [docs] (https://doc.rust-lang.org/nightly/cargo/reference/profiles.html#debug-1) [#17214] (rust-lang/cargo#17214) - Workspace members on edition 2024 or later can now override an inherited workspace dependency's `default-features` field. For example, `serde = { workspace = true, default-features = false }` now turns off default features even when the workspace definition enables them. On earlier editions, `default-features = false` is ignored with a warning. ([RFC 3945] (rust-lang/rfcs#3945)) [#17126](rust-lang/cargo#17126) - Incremental compilation is now disabled by default when running in CI. CI is detected via the CI environment variable. [#17220] (rust-lang/cargo#17220) See also the [full Cargo changelog] (https://doc.rust-lang.org/nightly/cargo/CHANGELOG.html#cargo-199-2026-10-01) Rustdoc ----- - [Add new `unused_footnote_definition` rustdoc lint] (rust-lang/rust#137858) - Smarter filtering of trait impls yields performance improvements of 20% on average and up to 40% on some real-world crates. ([1] (rust-lang/rust#159623), [2](rust-lang/rust#159721), [3](rust-lang/rust#159779), [4](rust-lang/rust#159854), [5](rust-lang/rust#159091)) Compatibility Notes ------------------- - [Fully deprecate the legacy integral modules] (rust-lang/rust#146882). For example, `std::i32::MAX` should be accessed via `i32::MAX` instead. - [Upgrade `no_mangle_generic_items` into hard error] (rust-lang/rust#154585) - [The `Pin::new_unchecked` has had its safety invariants changed slightly] (rust-lang/rust#156935) - [Do not promote references to extern statics] (rust-lang/rust#157641) - [Ensure that the inferred types of `let` patterns typecheck] (rust-lang/rust#157841) - [hermit/fs: Return `unsupported()` instead of `from_raw_os_error(22)`] (rust-lang/rust#158247) - [Fixed a bug where `#[repr(simd)]` was accidentally allowed on macro invocations on stable Rust] (rust-lang/rust#158523) - [Abort const-eval when there are generics in the type of the value being produced] (rust-lang/rust#159504) - [Attributes not applying to anything are now an error in code blocks in doc comments] (rust-lang/rust#159849) - [`Box::leak`: tell people to avoid unleaking] (rust-lang/rust#160323) - [PowerPC inline ASM: Fix scalar floats being in the wrong vector lane on little endian] (rust-lang/rust#160441) - [Do not take `doc(cfg())` into account when filtering doctests] (rust-lang/rust#159014) - [Infer anonymous lifetimes in the types of associated consts as `'static`] (rust-lang/rust#156508) - Macros that expand to a semicolon now produce a warning lint (`semicolon_in_expressions_from_non_local_macros`) even when the macro comes from another crate. Previously, such warnings only appeared for macros from the same crate, to avoid showing warnings that can't be fixed locally; however, this masked problems, as integration tests from the crate providing the macro get compiled as a separate crate, so tests often wouldn't reveal this issue. If you encounter a lint like this, please make sure to report it to the crate providing the macro so they can fix it; don't just silence it in your own crate. - [`semicolon_in_expressions_from_macros`: Lint on non-local macros too] (rust-lang/rust#159222) - [Split non-local `semicolon_in_expressions_from_macros` into a separate lint] (rust-lang/rust#159700) Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Update to LLVM 23] (rust-lang/rust#158734)

Don't escape U+FF9E and U+FF9F in escape_debug_ext

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rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Jun 18, 2026

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rustbot added A-Unicode Area: Unicode needs-fcp This change is insta-stable, or significant enough to need a team FCP to proceed. T-libs-api [DEPRECATED; DO NOT USE] labels Jun 18, 2026

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Jules-Bertholet added 2 commits June 18, 2026 23:28

Add note to doc comment of escape_grapheme_extender field

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Add tests

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Comment thread library/core/src/char/methods.rs

Add link to additional background info

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Escape additional classes of characters in escape_debug_ext #158286

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Tracking issue for release notes of #158057: Don't escape U+FF9E and U+FF9F in escape_debug_ext #159139

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Rollup of 7 pull requests #160199

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Rollup of 8 pull requests #160207

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Draft release notes for 1.99.0 #162306

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Darksonn commented Jun 19, 2026

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rust-bors Bot commented Jul 30, 2026

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