Replace printables table with `unicode_data.rs` tables by Jules-Bertholet · Pull Request #155527 · rust-lang/rust

Jules-Bertholet · 2026-04-19T21:46:54Z

This gets rid of the printable.py script, ensuring that unicode-table-generator handles all our Unicode data table generation needs.

There are also some drive-by documentation improvements in library/core/char/methods.rs.

There is one change in behavior: we now consider all characters with the Default_Ignorable_Code_Point property to be unprintable. These characters can be hidden/invisible otherwise.

I've chosen to give each Unicode property its own table, instead of merging them all into one. This is slightly less efficient in terms of space, but should allow us to expose these tables in the future with public methods on char.

@rustbot label A-Unicode

rustbot · 2026-04-19T21:46:58Z

library/core/src/unicode/unicode_data.rs is generated by the src/tools/unicode-table-generator tool.

If you want to modify unicode_data.rs, please modify the tool then regenerate the library source file via ./x run src/tools/unicode-table-generator instead of editing unicode_data.rs manually.

rustbot · 2026-04-19T21:47:00Z

r? @Mark-Simulacrum

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Owners of files modified in this PR: @scottmcm, libs
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Mark-Simulacrum · 2026-04-26T18:49:45Z

There is one change in behavior: we now consider all characters with the Default_Ignorable_Code_Point property to be unprintable. These characters can be hidden/invisible otherwise.

Nominating for libs-api to FCP this. @Jules-Bertholet can you write up how that affects the public API of std? i.e., where is that unprintability used (only in Debug impls of str)?

Mark-Simulacrum

Can you split out the re-ordering and renaming in char/methods.rs? It's very hard to review the diff for me when methods are moved around in the file. It also seems entirely unrelated to the core change here and I'd rather have separate commits at least.

The changes look broadly reasonable though, I'd be happy to accept them if separated out (including maybe from the libs-api facing change).

View changes since this review

rustbot · 2026-04-26T18:57:28Z

Reminder, once the PR becomes ready for a review, use @rustbot ready.

Jules-Bertholet · 2026-04-26T22:56:02Z

@rustbot ready

6079a98 is the libs-API-relevant change. It affects the Debug impls for char and the various string types, as well as the escape_debug() methods on char and str. The following characters are changed to be always escaped: https://util.unicode.org/UnicodeJsps/list-unicodeset.jsp?a=%5Cp%7BDefault_Ignorable_Code_Point%7D-%5Cp%7BCf%7D-%5Cp%7BCn%7D

Note that we may also wish to stop escaping format control characters which are not default-ignorable. The list of characters this would affect: https://util.unicode.org/UnicodeJsps/list-unicodeset.jsp?a=%5Cp%7BCf%7D-%5Cp%7BDefault_Ignorable_Code_Point%7D

nia-e · 2026-04-28T17:34:59Z

We discussed this in today's @rust-lang/libs-api meeting; +1 for us, but we'd like someone with more unicode knowledge to weigh in to be safe so cc @Manishearth (offtopic, it would be nice to have an @rust-lang/unicode-knowers ping group since these issues arise pretty often)

Manishearth · 2026-04-28T20:28:54Z

I didn't look too closely, but this seems fine. From a quick look the printability concern is for debug output, and yes, being more conservative there makes sense.

Manishearth · 2026-04-28T20:29:52Z

While you shouldn't depend on ICU4X in the stdlib, it may be worth using ICU4X to get your unicode properties, instead of fetching them yourself. This does mean you are beholden to ICU4X for unicode updates though.

Amanieu · 2026-05-05T15:28:02Z

@rfcbot merge libs-api

rust-rfcbot · 2026-05-05T15:28:05Z

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

No concerns currently listed.

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.

Mark-Simulacrum

r=me with FCP complete

View changes since this review

@rustbot

…Mark-Simulacrum Replace printables table with `unicode_data.rs` tables This gets rid of the `printable.py` script, ensuring that `unicode-table-generator` handles all our Unicode data table generation needs. There are also some drive-by documentation improvements in `library/core/char/methods.rs`. There is one change in behavior: we now consider all characters with the `Default_Ignorable_Code_Point` property to be unprintable. These characters can be hidden/invisible otherwise. I've chosen to give each Unicode property its own table, instead of merging them all into one. This is slightly less efficient in terms of space, but should allow us to expose these tables in the future with public methods on `char`. @rustbot label A-Unicode

@rustbot

…Mark-Simulacrum Replace printables table with `unicode_data.rs` tables This gets rid of the `printable.py` script, ensuring that `unicode-table-generator` handles all our Unicode data table generation needs. There are also some drive-by documentation improvements in `library/core/char/methods.rs`. There is one change in behavior: we now consider all characters with the `Default_Ignorable_Code_Point` property to be unprintable. These characters can be hidden/invisible otherwise. I've chosen to give each Unicode property its own table, instead of merging them all into one. This is slightly less efficient in terms of space, but should allow us to expose these tables in the future with public methods on `char`. @rustbot label A-Unicode

@rustbot

…Mark-Simulacrum Replace printables table with `unicode_data.rs` tables This gets rid of the `printable.py` script, ensuring that `unicode-table-generator` handles all our Unicode data table generation needs. There are also some drive-by documentation improvements in `library/core/char/methods.rs`. There is one change in behavior: we now consider all characters with the `Default_Ignorable_Code_Point` property to be unprintable. These characters can be hidden/invisible otherwise. I've chosen to give each Unicode property its own table, instead of merging them all into one. This is slightly less efficient in terms of space, but should allow us to expose these tables in the future with public methods on `char`. @rustbot label A-Unicode

@rustbot

…Mark-Simulacrum Replace printables table with `unicode_data.rs` tables This gets rid of the `printable.py` script, ensuring that `unicode-table-generator` handles all our Unicode data table generation needs. There are also some drive-by documentation improvements in `library/core/char/methods.rs`. There is one change in behavior: we now consider all characters with the `Default_Ignorable_Code_Point` property to be unprintable. These characters can be hidden/invisible otherwise. I've chosen to give each Unicode property its own table, instead of merging them all into one. This is slightly less efficient in terms of space, but should allow us to expose these tables in the future with public methods on `char`. @rustbot label A-Unicode

Rollup of 31 pull requests Successful merges: - #141030 (Expand free alias types during variance computation) - #154853 (mgca: Register `ConstArgHasType` when normalizing projection consts) - #155527 (Replace printables table with `unicode_data.rs` tables) - #156629 (Stabilize `core::range::{legacy, RangeFull, RangeTo}`) - #157280 (traits: Allow escaping self types in ExistentialTraitRef::with_self_ty) - #157282 (Fix post-monomorphization error note race in the parallel frontend) - #157352 (Make the retained dep graph deterministic under the parallel frontend) - #157601 (Emit error for unused target expression in glob and list delegations) - #157611 (Update `browser-ui-test` version to `0.24.0`) - #157620 (Add a strategy FnMut to inject behavior into the flush cycle) - #157645 (Windows TLS - Only register the `atexit` hook when `cleanup` can be unloaded) - #157646 (Keep rename-imported main alive in dead-code analysis under `--test`) - #157647 (Start using comptime for reflection intrinsics and their wrapper functions) - #157719 (resolve: Partially revert "Remove a special case for dummy imports") - #155153 (Ensure Send/Sync is not implemented for std::env::Vars{,Os}) - #155198 (fix(mgca): Allow specifying generic args (of enum) on enum itself in unit & tuple variant constructions in (direct) const args) - #155323 (refactor `TypeRelativePath::AssocItem` to use `AliasTerm`) - #156497 (fix-155516: Don't suggest wrong unwrap expect) - #156583 (Support defaults for static EIIs) - #157013 (Ensure inferred let pattern types are well-formed) - #157196 (Only suggest reborrowing a moved value where the reborrow is valid) - #157230 (borrowck: avoid ICE describing fields on generic params) - #157288 (platform support: add SNaN erratum to MIPS targets) - #157330 (remove `IsTypeConst` from `hir::TraitItemKind`) - #157350 (compiletest: ignore SVG `y` offset in by-lines comparison) - #157355 (Add `or_try_*` variants for `HashMap` and `BTreeMap` Entry APIs) - #157577 (Fix parser error recovery treating 'dyn' as a strict keyword in Rust 2015 when used in `dyn + dyn`) - #157670 (Rename `errors.rs` file to `diagnostics.rs` (4/N)) - #157691 (Move symbol hiding code to a new file) - #157700 (Rename `errors.rs` file to `diagnostics.rs` (5/N)) - #157703 (Fix doc link to Instant sub in saturating caveat) Failed merges: - #157699 (Arg splat experiment - hir FnDecl impl)

@rustbot

Rollup merge of #155527 - Jules-Bertholet:riir-printable, r=Mark-Simulacrum Replace printables table with `unicode_data.rs` tables This gets rid of the `printable.py` script, ensuring that `unicode-table-generator` handles all our Unicode data table generation needs. There are also some drive-by documentation improvements in `library/core/char/methods.rs`. There is one change in behavior: we now consider all characters with the `Default_Ignorable_Code_Point` property to be unprintable. These characters can be hidden/invisible otherwise. I've chosen to give each Unicode property its own table, instead of merging them all into one. This is slightly less efficient in terms of space, but should allow us to expose these tables in the future with public methods on `char`. @rustbot label A-Unicode

Rollup of 31 pull requests Successful merges: - rust-lang#141030 (Expand free alias types during variance computation) - rust-lang#154853 (mgca: Register `ConstArgHasType` when normalizing projection consts) - rust-lang#155527 (Replace printables table with `unicode_data.rs` tables) - rust-lang#156629 (Stabilize `core::range::{legacy, RangeFull, RangeTo}`) - rust-lang#157280 (traits: Allow escaping self types in ExistentialTraitRef::with_self_ty) - rust-lang#157282 (Fix post-monomorphization error note race in the parallel frontend) - rust-lang#157352 (Make the retained dep graph deterministic under the parallel frontend) - rust-lang#157601 (Emit error for unused target expression in glob and list delegations) - rust-lang#157611 (Update `browser-ui-test` version to `0.24.0`) - rust-lang#157620 (Add a strategy FnMut to inject behavior into the flush cycle) - rust-lang#157645 (Windows TLS - Only register the `atexit` hook when `cleanup` can be unloaded) - rust-lang#157646 (Keep rename-imported main alive in dead-code analysis under `--test`) - rust-lang#157647 (Start using comptime for reflection intrinsics and their wrapper functions) - rust-lang#157719 (resolve: Partially revert "Remove a special case for dummy imports") - rust-lang#155153 (Ensure Send/Sync is not implemented for std::env::Vars{,Os}) - rust-lang#155198 (fix(mgca): Allow specifying generic args (of enum) on enum itself in unit & tuple variant constructions in (direct) const args) - rust-lang#155323 (refactor `TypeRelativePath::AssocItem` to use `AliasTerm`) - rust-lang#156497 (fix-155516: Don't suggest wrong unwrap expect) - rust-lang#156583 (Support defaults for static EIIs) - rust-lang#157013 (Ensure inferred let pattern types are well-formed) - rust-lang#157196 (Only suggest reborrowing a moved value where the reborrow is valid) - rust-lang#157230 (borrowck: avoid ICE describing fields on generic params) - rust-lang#157288 (platform support: add SNaN erratum to MIPS targets) - rust-lang#157330 (remove `IsTypeConst` from `hir::TraitItemKind`) - rust-lang#157350 (compiletest: ignore SVG `y` offset in by-lines comparison) - rust-lang#157355 (Add `or_try_*` variants for `HashMap` and `BTreeMap` Entry APIs) - rust-lang#157577 (Fix parser error recovery treating 'dyn' as a strict keyword in Rust 2015 when used in `dyn + dyn`) - rust-lang#157670 (Rename `errors.rs` file to `diagnostics.rs` (4/N)) - rust-lang#157691 (Move symbol hiding code to a new file) - rust-lang#157700 (Rename `errors.rs` file to `diagnostics.rs` (5/N)) - rust-lang#157703 (Fix doc link to Instant sub in saturating caveat) Failed merges: - rust-lang#157699 (Arg splat experiment - hir FnDecl impl)

JonathanBrouwer · 2026-06-13T10:49:54Z

@rust-timer build d97e782

rust-timer · 2026-06-13T14:40:57Z

Finished benchmarking commit (d97e782): comparison URL.

Overall result: ❌ regressions - no action needed

Benchmarking means the PR may be perf-sensitive. Consider adding rollup=never if this change is not fit for rolling up.

@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	0.6%	[0.6%, 0.6%]	1
Regressions ❌ (secondary)	0.2%	[0.2%, 0.2%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.6%	[0.6%, 0.6%]	1

Max RSS (memory usage)

Results (primary -1.9%, secondary -2.2%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	0.8%	[0.8%, 0.8%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-2.7%	[-3.5%, -2.0%]	3
Improvements ✅ (secondary)	-2.2%	[-2.2%, -2.2%]	1
All ❌✅ (primary)	-1.9%	[-3.5%, 0.8%]	4

Cycles

Results (primary 2.1%, secondary -4.2%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	2.1%	[2.1%, 2.1%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-4.2%	[-4.2%, -4.2%]	1
All ❌✅ (primary)	2.1%	[2.1%, 2.1%]	1

Binary size

Results (primary 0.2%, secondary 0.5%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	0.2%	[0.0%, 0.6%]	16
Regressions ❌ (secondary)	0.5%	[0.4%, 0.6%]	42
Improvements ✅ (primary)	-0.1%	[-0.1%, -0.1%]	1
Improvements ✅ (secondary)	-0.0%	[-0.0%, -0.0%]	1
All ❌✅ (primary)	0.2%	[-0.1%, 0.6%]	17

Bootstrap: 517.006s -> 516.074s (-0.18%)
Artifact size: 401.43 MiB -> 400.91 MiB (-0.13%)

JonathanBrouwer · 2026-06-13T16:41:50Z

Regression is real but small enough that we can probably ignore this?

Jules-Bertholet · 2026-06-13T19:36:04Z

Yeah, I would expect a small regression (because we are doing more table lookups)—but it should only affect debug printing.

panstromek · 2026-06-16T07:07:47Z

Cargo spends more time in LLVM optimizations, so this might have triggered some new optimization opportunities (also, this only affects the patch-println variant which seems to make a lot of sense).

include-blob check spends more time in metadata decoding, which would also make sense, as this PR seems to make core/std metadata bigger? We don't measure that directly, though, as far as I know.

But I agree we can probably ignore this.

Rollup of 25 pull requests Successful merges: - rust-lang/rust#157251 (`rust-analyzer` subtree update) - rust-lang/rust#157533 (Subtree sync for rustc_codegen_cranelift) - rust-lang/rust#154742 (Add APIs for case folding to the standard library) - rust-lang/rust#155144 (mir_build: Add an extra intermediate step in MIR building for patterns ) - rust-lang/rust#156222 (Stabilize `Result::map_or_default` and `Option::map_or_default`) - rust-lang/rust#157016 (add `extern "tail"` calling convention) - rust-lang/rust#157264 (diagnostics: Fix ICE building a trait ref in method suggestions) - rust-lang/rust#157386 (Parse deprecated note links separately in rustc_resolve) - rust-lang/rust#157483 (fix windows-gnu TLS leak) - rust-lang/rust#157488 (compiletest: inject `#![windows_subsystem = "windows"]` to debuginfo tests on Windows) - rust-lang/rust#157509 (remove solaris implementation for File::lock, it has the wrong semantics) - rust-lang/rust#157521 (Rename `SyncView::{as_pin => as_pin_ref}`) - rust-lang/rust#156136 (Move tests box) - rust-lang/rust#156573 (Add unwinder_private_data_size for wasm64 target) - rust-lang/rust#156783 (docs: make `Rc::into_raw` clickable in `Rc::increment_strong_count` doc) - rust-lang/rust#156840 (Stabilize `PathBuf::into_string`) - rust-lang/rust#156936 (Remove FIXME about impl PinCoerceUnsized for UnsafePinned<T>) - rust-lang/rust#157365 (Revert "LLVM 23: Run AssignGUIDPass in some places") - rust-lang/rust#157380 (clarify compiler_fence (and fence) docs) - rust-lang/rust#157471 (Debug assert that parsed attributes are in the `BUILTIN_ATTRIBUTE_MAP`) - rust-lang/rust#157485 (Rename `errors.rs` file to `diagnostics.rs` (1/N)) - rust-lang/rust#157494 (Convert `QueryRegionConstraint` into a struct) - rust-lang/rust#157526 (std tests: skip a slow test on Miri) - rust-lang/rust#157531 (ci: bump x86_64-gnu base image to 26.04) - rust-lang/rust#157556 (Add `BTree::append()` change to 1.96.0 relnotes) Failed merges: - rust-lang/rust#155527 (Replace printables table with `unicode_data.rs` tables)

@rustbot

…le, r=Mark-Simulacrum Make `char::is_default_ignorable` unstably public Similar to rust-lang#154849; this function is used in the implementation of `char::escape_debug()`, and there's no reason to force crates to duplicate a data table that std has to ship anyway. I'll add a tracking issue if this is approved. (I'll do the other data tables from rust-lang#155527 in separate PRs.) @rustbot label A-Unicode T-libs-api Tracking issue: rust-lang#160583 r? @Mark-Simulacrum

@rustbot

Rollup merge of #157944 - Jules-Bertholet:is-default-ignorable, r=Mark-Simulacrum Make `char::is_default_ignorable` unstably public Similar to #154849; this function is used in the implementation of `char::escape_debug()`, and there's no reason to force crates to duplicate a data table that std has to ship anyway. I'll add a tracking issue if this is approved. (I'll do the other data tables from #155527 in separate PRs.) @rustbot label A-Unicode T-libs-api Tracking issue: #160583 r? @Mark-Simulacrum

Rollup of 31 pull requests Successful merges: - rust-lang/rust#141030 (Expand free alias types during variance computation) - rust-lang/rust#154853 (mgca: Register `ConstArgHasType` when normalizing projection consts) - rust-lang/rust#155527 (Replace printables table with `unicode_data.rs` tables) - rust-lang/rust#156629 (Stabilize `core::range::{legacy, RangeFull, RangeTo}`) - rust-lang/rust#157280 (traits: Allow escaping self types in ExistentialTraitRef::with_self_ty) - rust-lang/rust#157282 (Fix post-monomorphization error note race in the parallel frontend) - rust-lang/rust#157352 (Make the retained dep graph deterministic under the parallel frontend) - rust-lang/rust#157601 (Emit error for unused target expression in glob and list delegations) - rust-lang/rust#157611 (Update `browser-ui-test` version to `0.24.0`) - rust-lang/rust#157620 (Add a strategy FnMut to inject behavior into the flush cycle) - rust-lang/rust#157645 (Windows TLS - Only register the `atexit` hook when `cleanup` can be unloaded) - rust-lang/rust#157646 (Keep rename-imported main alive in dead-code analysis under `--test`) - rust-lang/rust#157647 (Start using comptime for reflection intrinsics and their wrapper functions) - rust-lang/rust#157719 (resolve: Partially revert "Remove a special case for dummy imports") - rust-lang/rust#155153 (Ensure Send/Sync is not implemented for std::env::Vars{,Os}) - rust-lang/rust#155198 (fix(mgca): Allow specifying generic args (of enum) on enum itself in unit & tuple variant constructions in (direct) const args) - rust-lang/rust#155323 (refactor `TypeRelativePath::AssocItem` to use `AliasTerm`) - rust-lang/rust#156497 (fix-155516: Don't suggest wrong unwrap expect) - rust-lang/rust#156583 (Support defaults for static EIIs) - rust-lang/rust#157013 (Ensure inferred let pattern types are well-formed) - rust-lang/rust#157196 (Only suggest reborrowing a moved value where the reborrow is valid) - rust-lang/rust#157230 (borrowck: avoid ICE describing fields on generic params) - rust-lang/rust#157288 (platform support: add SNaN erratum to MIPS targets) - rust-lang/rust#157330 (remove `IsTypeConst` from `hir::TraitItemKind`) - rust-lang/rust#157350 (compiletest: ignore SVG `y` offset in by-lines comparison) - rust-lang/rust#157355 (Add `or_try_*` variants for `HashMap` and `BTreeMap` Entry APIs) - rust-lang/rust#157577 (Fix parser error recovery treating 'dyn' as a strict keyword in Rust 2015 when used in `dyn + dyn`) - rust-lang/rust#157670 (Rename `errors.rs` file to `diagnostics.rs` (4/N)) - rust-lang/rust#157691 (Move symbol hiding code to a new file) - rust-lang/rust#157700 (Rename `errors.rs` file to `diagnostics.rs` (5/N)) - rust-lang/rust#157703 (Fix doc link to Instant sub in saturating caveat) Failed merges: - rust-lang/rust#157699 (Arg splat experiment - hir FnDecl impl)

This MR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [rust](https://github.com/rust-lang/rust) | tools | minor | `1.97.1` → `1.98.0` | MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot). **Proposed changes to behavior should be submitted there as MRs.** --- ### Release Notes <details> <summary>rust-lang/rust (rust)</summary> ### [`v1.98.0`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1980-2026-08-20) [Compare Source](rust-lang/rust@1.97.1...1.98.0) \========================== <a id="1.98.0-Language"></a> ## Language - [Allow shortening lifetime of `&mut` when unsize-coercing, even in an invariant position.](rust-lang/rust#149219) For example, you can now coerce a `Cell<&'long mut i32>` to a `Cell<&'short mut dyn Send>`. Such shortenings were already previously allowed when coercing a `&mut` to a `&`, or coercing a `&` to a `&`. - [Add deny-by-default `invalid_runtime_symbol_definitions` lint and warn-by-default `suspicious_runtime_symbol_definitions` lint](rust-lang/rust#155521) - The lints currently specifically targets `core` runtime symbols like `memcmp`, `memset`, `strlen`, ... and is planned to be expanded in the next few releases. - [Add warn-by-default `c_void_returns` lint to check `core::ffi::c_void` as a return type](rust-lang/rust#156379) <a id="1.98.0-Platform-Support"></a> ## Platform Support - [Add `powerpc64-unknown-linux-gnuelfv2` as Tier 3](rust-lang/rust#144220) - [Add `aarch64-unknown-linux-pauthtest` as Tier 3 target](rust-lang/rust#155722) - [Promote `thumbv7a-none-eabi` to Tier 2](rust-lang/rust#155763) - [Promote `thumbv7a-none-eabihf` to Tier 2](rust-lang/rust#155763) - [Promote `thumbv7r-none-eabi` to Tier 2](rust-lang/rust#155763) - [Promote `thumbv7r-none-eabihf` to Tier 2](rust-lang/rust#155763) - [Promote `thumbv8r-none-eabihf` to Tier 2](rust-lang/rust#155763) 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 <a id="1.98.0-Libraries"></a> ## Libraries - [Change `Location<'_>` lifetime to `'static` in `Panic[Hook]Info`](rust-lang/rust#146561) - [Document panic in `RangeInclusive::from(legacy::RangeInclusive)`](rust-lang/rust#155421) - [Document that `ManuallyDrop`'s `Box` interaction has been fixed](rust-lang/rust#155750) - [Stabilize LoongArch CRC Intrinsics](rust-lang/rust#156908) - [The `derive` macro is available at `{core,std}::derive`.](rust-lang/rust#154645) This was previously [unintentionally stabilized in 1.96](rust-lang/rust#159856), but is now [explicitly accepted](rust-lang/rust#154645) as a stabilized API. - Please note that the MSRV for `{core,std}::derive` will be 1.96, and not 1.98. <a id="1.98.0-Stabilized-APIs"></a> ## Stabilized APIs - [`str::substr_range`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.substr_range) - [`[T]::subslice_range`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.subslice_range) - [`core::fmt::NumBuffer`](https://doc.rust-lang.org/stable/core/fmt/struct.NumBuffer.html) - [`<{integer}>::format_into`](https://doc.rust-lang.org/stable/core/primitive.usize.html#method.format_into) - [`Send/Sync for std::process::CommandArgs`](https://doc.rust-lang.org/stable/std/process/struct.CommandArgs.html#impl-Send-for-CommandArgs%3C'a%3E) - [`{fN}::algebraic_add`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_add) - [`{fN}::algebraic_sub`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_sub) - [`{fN}::algebraic_mul`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_mul) - [`{fN}::algebraic_div`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_div) - [`{fN}::algebraic_rem`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_rem) - [`NonZero<{integer}>::from_str_radix`](https://doc.rust-lang.org/stable/core/num/struct.NonZero.html#method.from_str_radix-4) - [`String::from_utf16le`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16le) - [`String::from_utf16le_lossy`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16le_lossy) - [`String::from_utf16be`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16be) - [`String::from_utf16be_lossy`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16be_lossy) - [`[T]::strip_circumfix`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.strip_circumfix) - [`str::strip_circumfix`](https://doc.rust-lang.org/stable/core/primitive.str.html#method.strip_circumfix) - [`Atomic<T>::from_mut`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.from_mut) - [`Atomic<T>::get_mut_slice`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.get_mut_slice) - [`Atomic<T>::from_mut_slice`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.from_mut_slice) - [`std::range::legacy`](https://doc.rust-lang.org/stable/std/range/legacy/index.html) <a id="1.98.0-Compatibility-Notes"></a> ## Compatibility Notes - [If fully elided, lifetime bounds of trait object types may now resolve differently or even get rejected in very specific niche scenarios](rust-lang/rust#129543) - [Error in more cases of ambiguous imports](rust-lang/rust#145108) - [Switch the destructors implementation for thread locals on Windows to use Fiber Local Storage (FLS)](rust-lang/rust#148799) - [Convert some cases of the `ambiguous_glob_imports` lint into a hard error](rust-lang/rust#149195) - [Where-bounds of the form `Type = Type` and `Type == Type` are no longer syntactically allowed](rust-lang/rust#153513) - [Ensure Send/Sync is not implemented for std::env::Vars{,Os}](rust-lang/rust#155153) - [Fix that in some attributes, arguments were not properly rejected](rust-lang/rust#155193) - [`repr(transparent)` is now more strict about which fields have "trivial" layout and hence can be ignored: `repr(C)` types, types with private fields, and `#[non_exhaustive]` types are no longer considered "trivial"](rust-lang/rust#155299) - [Correctly check whether types have equal size in `transmute()` when some `repr` attributes are involved.](rust-lang/rust#155418) - [More characters are escaped when printing strings and chars](rust-lang/rust#155527) - [Implement fast path for `derive(PartialOrd)` when deriving `Ord`](rust-lang/rust#155598) This can break crates in practice where a type's PartialOrd and Ord impls were inconsistent with each other. - [Add temporary scope to `assert_eq` and `assert_ne`](rust-lang/rust#155739) - Closed a hole in the pattern matching [structural equality](https://doc.rust-lang.org/reference/patterns.html#constant-patterns) check, preventing cases where a match of a constant would be allowed, despite disagreeing with a manually written `PartialEq` implementation, when a `derive(PartialEq)` implementation for that type also exists. - [On Emscripten the WASM exception handling ABI is now unconditionally used](rust-lang/rust#156928) The `-Zemscripten-wasm-eh=false` flag to switch back to JS exceptions has been removed. - [The UNSAFE\_CODE lint is now consistently emitted for all unsafe attributes](rust-lang/rust#157201) - [Solaris: remove `File::lock` implementation, it has the wrong semantics (return "unsupported" instead)](rust-lang/rust#157509) - [Windows-gnu targets now specify baseline tools versions](rust-lang/rust#158020) - [rustfmt now discovers module files that are defined in `cfg_select!`](rust-lang/rust#158372) This may cause more code to be formatted which was previously ignored. </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this MR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this MR, check this box --- This MR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).

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 Apr 19, 2026

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jhpratt mentioned this pull request Jun 11, 2026

Rollup of 28 pull requests #157735

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Rollup of 31 pull requests #157739

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Jules-Bertholet mentioned this pull request Jun 15, 2026

Make char::is_default_ignorable unstably public #157944

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tshepang mentioned this pull request Jun 17, 2026

Automated pull from upstream HEAD ferrocene/ferrocene#2402

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Jules-Bertholet mentioned this pull request Jun 23, 2026

Escape additional classes of characters in escape_debug_ext #158286

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BoxyUwU mentioned this pull request Aug 7, 2026

Draft release notes for 1.98.0 #160700

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rust-timer commented Jun 13, 2026

Overall result: ❌ regressions - no action needed

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