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Matthias Krüger 5da750001d
Rollup merge of #136520 - compiler-errors:redundant-layout-assert, r=lcnr 
Remove unnecessary layout assertions for object-safe receivers

The soundness of `DispatchFromDyn` relies on the fact that, like all other built-in marker-like layout traits (e.g. `Sized`, `CoerceUnsized`), the guarantees that they enforce in *generic* code via traits will result in assumptions that we can rely on in codegen.

Specifically, `DispatchFromDyn` ensures that we end up with a receiver that is a valid pointer type, and its implementation validity recursively ensures that the ABI of that pointer type upholds the `Scalar` or `ScalarPair` representation for sized and unsized pointees, respectively.

The check that this layout guarantee holds for arbitrary, possibly generic receiver types that also may exist in possibly impossible-to-instantiate where clauses is overkill IMO, and leads to several ICEs due to the fact that computing layouts before monomorphization is going to be fallible at best.

This PR removes the check altogether, since it just exists as a sanity check from very long ago, 6f2a161b1b.

Fixes #125810
Fixes #90110

This PR is an alternative to #136195. cc `@adetaylor.` I didn't realize in that PR that the layout checks that were being modified were simply *sanity checks*, rather than being actually necessary for soundness.
2025-02-04 18:49:41 +01:00
.github Merge remote-tracking branch 'upstream/master' into rustup 2025-01-28 19:14:45 +01:00
compiler Rollup merge of #136520 - compiler-errors:redundant-layout-assert, r=lcnr 2025-02-04 18:49:41 +01:00
library Auto merge of #136534 - jhpratt:rollup-dnz57dq, r=jhpratt 2025-02-04 14:59:25 +00:00
LICENSES Synchronize Unicode license text from unicode.org 2024-11-20 00:54:12 -08:00
src Rollup merge of #136284 - oli-obk:push-zsxuwnzmonnl, r=lcnr 2025-02-04 18:49:37 +01:00
tests Rollup merge of #136520 - compiler-errors:redundant-layout-assert, r=lcnr 2025-02-04 18:49:41 +01:00
.clang-format Add .clang-format 2024-06-26 05:56:00 +08:00
.editorconfig Only use max_line_length = 100 for *.rs 2023-07-10 15:18:36 -07:00
.git-blame-ignore-revs Add rustfmt 2024 reformatting to git blame ignore 2024-09-23 10:02:04 +02:00
.gitattributes Revert "Stop git from merging generated files" 2024-12-12 07:20:11 +01:00
.gitignore Ignore mermaid.min.js 2025-01-20 16:08:08 -05:00
.gitmodules Removed rustc-dev-guide as a submodule 2025-01-01 17:05:53 +01:00
.ignore Add .ignore file to make config.toml searchable in vscode 2024-06-24 10:15:16 +02:00
.mailmap Rollup merge of #134965 - Noratrieb:slightly-late-for-boxing-day-sadly-but-still-almost, r=BoxyUwU 2025-01-03 22:12:42 +01:00
Cargo.lock Rollup merge of #135844 - yaahc:tidy-feature-status-dump, r=jieyouxu 2025-02-04 05:36:51 -05:00
Cargo.toml features-status-dump: add new build-metrics tool 2025-01-26 14:45:05 +08:00
CODE_OF_CONDUCT.md Remove the code of conduct; instead link https://www.rust-lang.org/conduct.html 2019-10-05 22:55:19 +02:00
config.example.toml add optimized-compiler-builtins to target specific section 2025-01-10 11:47:06 +03:00
configure Ensure ./configure works when configure.py path contains spaces 2024-02-16 18:57:22 +00:00
CONTRIBUTING.md docs: update contributing docs for submodule/subtree changes 2025-01-20 21:53:59 +08:00
COPYRIGHT dist: Re-work how we describe the licence of Rust in our distributions 2024-12-09 10:18:55 +00:00
INSTALL.md add clarity for custom path installation 2024-10-06 07:37:00 -05:00
LICENSE-APACHE Remove appendix from LICENCE-APACHE 2019-12-30 14:25:53 +00:00
license-metadata.json Add italic for newly added sans serif fonts 2025-01-29 11:01:14 +01:00
LICENSE-MIT dist: Re-work how we describe the licence of Rust in our distributions 2024-12-09 10:18:55 +00:00
README.md Add new lint doc_overindented_list_items 2025-01-28 16:22:28 +09:00
RELEASES.md Rollup merge of #136266 - cyrgani:patch-1, r=Mark-Simulacrum 2025-02-01 01:19:20 +01:00
REUSE.toml Fix tidy errors 2025-01-29 11:01:14 +01:00
rust-bors.toml Increase timeout for new bors bot 2024-03-13 08:31:07 +01:00
rustfmt.toml Select edition 2024 2025-01-13 16:55:42 +01:00
triagebot.toml triagebot: remove myself from vacation 2025-01-31 14:46:13 +08:00
x fix(x): fix a regex used to find python executable 2024-11-06 16:40:02 +03:00
x.ps1 use & instead of start-process in x.ps1 2023-12-09 09:46:16 -05:00
x.py Reformat Python code with ruff 2024-12-04 23:03:44 +01:00

README.md

This is the main source code repository for Rust. It contains the compiler, standard library, and documentation.

Why Rust?

  • Performance: Fast and memory-efficient, suitable for critical services, embedded devices, and easily integrated with other languages.

  • Reliability: Our rich type system and ownership model ensure memory and thread safety, reducing bugs at compile-time.

  • Productivity: Comprehensive documentation, a compiler committed to providing great diagnostics, and advanced tooling including package manager and build tool (Cargo), auto-formatter (rustfmt), linter (Clippy) and editor support (rust-analyzer).

Quick Start

Read "Installation" from The Book.

Installing from Source

If you really want to install from source (though this is not recommended), see INSTALL.md.

Getting Help

See https://www.rust-lang.org/community for a list of chat platforms and forums.

Contributing

See CONTRIBUTING.md.

License

Rust is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0), with portions covered by various BSD-like licenses.

See LICENSE-APACHE, LICENSE-MIT, and COPYRIGHT for details.

Trademark

The Rust Foundation owns and protects the Rust and Cargo trademarks and logos (the "Rust Trademarks").

If you want to use these names or brands, please read the media guide.

Third-party logos may be subject to third-party copyrights and trademarks. See Licenses for details.