Update unicode_data to Unicode version 18.0.0 by Kmeakin · Pull Request #162929 · rust-lang/rust

Kmeakin · 2026-09-17T21:40:20Z

Had to add an extra array to L2Lut to account for characters that change plane when case-mapped (so far, only U+1DF95 LATIN SMALL LIGATURE LONG S WITH DESCENDER S).

Also made version() defer to ucd_parse::ucd_directory_version(), which is more robust to minor changes in the ReadMe.txt format.

rustbot · 2026-09-17T21:40:24Z

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 · 2026-09-17T21:40:27Z

r? @JohnTitor

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libs expanded to 12 candidates
Random selection from Darksonn, JohnTitor, Mark-Simulacrum, clarfonthey, jhpratt

clarfonthey · 2026-09-17T21:52:09Z

r? clarfonthey

I'll take this over since I already reviewed a similar PR that was closed. Knew about the exceptions, wasn't sure how exactly they should be handled, but I like this method.

Had to add an extra array to `L2Lut` to account for characters that change plane when case-mapped (so far, only U+1DF95 LATIN SMALL LIGATURE LONG S WITH DESCENDER S). Also made `version()` defer to `ucd_parse::ucd_directory_version()`, which is more robust to minor changes in the ReadMe.txt format.

clarfonthey · 2026-09-18T10:54:45Z

@bors r+ rollup

Thank you!

rust-bors · 2026-09-18T10:54:47Z

📌 Commit b5df62e has been approved by clarfonthey

It is now in the queue for this repository.

Update unicode_data to Unicode version 18.0.0 Had to add an extra array to `L2Lut` to account for characters that change plane when case-mapped (so far, only U+1DF95 LATIN SMALL LIGATURE LONG S WITH DESCENDER S). Also made `version()` defer to `ucd_parse::ucd_directory_version()`, which is more robust to minor changes in the ReadMe.txt format.

…uwer Rollup of 15 pull requests Successful merges: - #160401 (sparc: make ABI consistent with clang) - #161777 (Add Natvis visualiser and debuginfo tests for `f128`) - #162423 (Rename the src install build step to rust-src.) - #162740 (stdarch subtree update) - #162824 (link Enzyme and the offload with in-tree lld if possible) - #161005 (fix: unfulfilled nested dead code lint) - #161803 (Fix docs of make_ascii_lowercase/make_ascii_upercase) - #162256 (Add mentions to sync back `RELEASES.md` to the `main` branch) - #162661 (simplify `Target::GenericParam`) - #162666 (Tidy footnote in `platform-support.md`) - #162803 (docs(num): add documentation for `NonZero::from_str`) - #162906 (Move more `rustdoc-html` tests in the right location) - #162922 (An assortment of polonius tweaks) - #162929 (Update unicode_data to Unicode version 18.0.0) - #162930 (Use niche length type for strlen to guarantee `isize::MAX` bound)

Update unicode_data to Unicode version 18.0.0 Had to add an extra array to `L2Lut` to account for characters that change plane when case-mapped (so far, only U+1DF95 LATIN SMALL LIGATURE LONG S WITH DESCENDER S). Also made `version()` defer to `ucd_parse::ucd_directory_version()`, which is more robust to minor changes in the ReadMe.txt format.

…uwer Rollup of 14 pull requests Successful merges: - #160401 (sparc: make ABI consistent with clang) - #161777 (Add Natvis visualiser and debuginfo tests for `f128`) - #162740 (stdarch subtree update) - #162824 (link Enzyme and the offload with in-tree lld if possible) - #161005 (fix: unfulfilled nested dead code lint) - #161803 (Fix docs of make_ascii_lowercase/make_ascii_upercase) - #162256 (Add mentions to sync back `RELEASES.md` to the `main` branch) - #162661 (simplify `Target::GenericParam`) - #162666 (Tidy footnote in `platform-support.md`) - #162803 (docs(num): add documentation for `NonZero::from_str`) - #162906 (Move more `rustdoc-html` tests in the right location) - #162922 (An assortment of polonius tweaks) - #162929 (Update unicode_data to Unicode version 18.0.0) - #162930 (Use niche length type for strlen to guarantee `isize::MAX` bound)

Update unicode_data to Unicode version 18.0.0 Had to add an extra array to `L2Lut` to account for characters that change plane when case-mapped (so far, only U+1DF95 LATIN SMALL LIGATURE LONG S WITH DESCENDER S). Also made `version()` defer to `ucd_parse::ucd_directory_version()`, which is more robust to minor changes in the ReadMe.txt format.

…uwer Rollup of 20 pull requests Successful merges: - #160401 (sparc: make ABI consistent with clang) - #162715 (don't calculate dtors if the self ty has impossible bounds) - #162740 (stdarch subtree update) - #162824 (link Enzyme and the offload with in-tree lld if possible) - #162946 (Simplify query stack printing) - #161005 (fix: unfulfilled nested dead code lint) - #161246 (Normalize non-rigid aliases in ty_known_to_outlive) - #161803 (Fix docs of make_ascii_lowercase/make_ascii_upercase) - #162256 (Add mentions to sync back `RELEASES.md` to the `main` branch) - #162661 (simplify `Target::GenericParam`) - #162666 (Tidy footnote in `platform-support.md`) - #162803 (docs(num): add documentation for `NonZero::from_str`) - #162879 (use u64 limbs in core::num::bignum) - #162903 (PassWrapper: adapt to LLVM reading exception model from module flag) - #162905 (c-variadic: add checks for windows i686) - #162906 (Move more `rustdoc-html` tests in the right location) - #162922 (An assortment of polonius tweaks) - #162929 (Update unicode_data to Unicode version 18.0.0) - #162930 (Use niche length type for strlen to guarantee `isize::MAX` bound) - #162960 (Guard types with unstable `Allocator` params ahead of partial stabilization)

…uwer Rollup of 19 pull requests Successful merges: - #160401 (sparc: make ABI consistent with clang) - #162715 (don't calculate dtors if the self ty has impossible bounds) - #162740 (stdarch subtree update) - #162946 (Simplify query stack printing) - #161005 (fix: unfulfilled nested dead code lint) - #161246 (Normalize non-rigid aliases in ty_known_to_outlive) - #161803 (Fix docs of make_ascii_lowercase/make_ascii_upercase) - #162256 (Add mentions to sync back `RELEASES.md` to the `main` branch) - #162661 (simplify `Target::GenericParam`) - #162666 (Tidy footnote in `platform-support.md`) - #162803 (docs(num): add documentation for `NonZero::from_str`) - #162879 (use u64 limbs in core::num::bignum) - #162903 (PassWrapper: adapt to LLVM reading exception model from module flag) - #162905 (c-variadic: add checks for windows i686) - #162906 (Move more `rustdoc-html` tests in the right location) - #162922 (An assortment of polonius tweaks) - #162929 (Update unicode_data to Unicode version 18.0.0) - #162930 (Use niche length type for strlen to guarantee `isize::MAX` bound) - #162960 (Guard types with unstable `Allocator` params ahead of partial stabilization)

Rollup merge of #162929 - Kmeakin:km/unicode-18, r=clarfonthey Update unicode_data to Unicode version 18.0.0 Had to add an extra array to `L2Lut` to account for characters that change plane when case-mapped (so far, only U+1DF95 LATIN SMALL LIGATURE LONG S WITH DESCENDER S). Also made `version()` defer to `ucd_parse::ucd_directory_version()`, which is more robust to minor changes in the ReadMe.txt format.

…uwer Rollup of 19 pull requests Successful merges: - rust-lang/rust#160401 (sparc: make ABI consistent with clang) - rust-lang/rust#162715 (don't calculate dtors if the self ty has impossible bounds) - rust-lang/rust#162740 (stdarch subtree update) - rust-lang/rust#162946 (Simplify query stack printing) - rust-lang/rust#161005 (fix: unfulfilled nested dead code lint) - rust-lang/rust#161246 (Normalize non-rigid aliases in ty_known_to_outlive) - rust-lang/rust#161803 (Fix docs of make_ascii_lowercase/make_ascii_upercase) - rust-lang/rust#162256 (Add mentions to sync back `RELEASES.md` to the `main` branch) - rust-lang/rust#162661 (simplify `Target::GenericParam`) - rust-lang/rust#162666 (Tidy footnote in `platform-support.md`) - rust-lang/rust#162803 (docs(num): add documentation for `NonZero::from_str`) - rust-lang/rust#162879 (use u64 limbs in core::num::bignum) - rust-lang/rust#162903 (PassWrapper: adapt to LLVM reading exception model from module flag) - rust-lang/rust#162905 (c-variadic: add checks for windows i686) - rust-lang/rust#162906 (Move more `rustdoc-html` tests in the right location) - rust-lang/rust#162922 (An assortment of polonius tweaks) - rust-lang/rust#162929 (Update unicode_data to Unicode version 18.0.0) - rust-lang/rust#162930 (Use niche length type for strlen to guarantee `isize::MAX` bound) - rust-lang/rust#162960 (Guard types with unstable `Allocator` params ahead of partial stabilization)

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 Sep 17, 2026

rustbot assigned JohnTitor Sep 17, 2026

Kmeakin force-pushed the km/unicode-18 branch from 2172303 to 7c12ed8 Compare September 17, 2026 21:51

clarfonthey reviewed Sep 17, 2026

View reviewed changes

Comment thread src/tools/unicode-table-generator/src/case_mapping.rs Outdated

rustbot assigned clarfonthey and unassigned JohnTitor Sep 17, 2026

Kmeakin force-pushed the km/unicode-18 branch 2 times, most recently from 69b8eb8 to 00f0e06 Compare September 18, 2026 03:12

Kmeakin force-pushed the km/unicode-18 branch from 00f0e06 to b5df62e Compare September 18, 2026 03:14

rust-bors Bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Sep 18, 2026

JonathanBrouwer mentioned this pull request Sep 18, 2026

Rollup of 15 pull requests #162954

Closed

JonathanBrouwer mentioned this pull request Sep 18, 2026

Rollup of 14 pull requests #162973

Closed

JonathanBrouwer mentioned this pull request Sep 18, 2026

Rollup of 20 pull requests #162980

Closed

JonathanBrouwer mentioned this pull request Sep 18, 2026

Rollup of 20 pull requests #162983

Closed

clarfonthey mentioned this pull request Sep 18, 2026

Update generated tables to Unicode 18, 3rd try #162982

Closed

JonathanBrouwer mentioned this pull request Sep 18, 2026

Rollup of 19 pull requests #162989

Merged

rust-bors Bot merged commit 44a88ba into rust-lang:main Sep 19, 2026
13 checks passed

rustbot added this to the 1.100.0 milestone Sep 19, 2026

Kmeakin deleted the km/unicode-18 branch September 19, 2026 08:35

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Update unicode_data to Unicode version 18.0.0 - #162929

Update unicode_data to Unicode version 18.0.0#162929
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