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bors eb5e2449c5 Auto merge of #125864 - compiler-errors:opt-in-error-reporting, r=lcnr 
Opt-in to `FulfillmentError` generation to avoid doing extra work in the new solver

In the new solver, we do additional trait solving in order to generate fulfillment errors, because all we have is the root obligation. This is problematic because there are many cases where we don't need the full error information, and instead are just calling `ObligationCtxt::select_all_or_error` to probe whether a predicate holds or not. This is also problematic because we use `ObligationCtxt`s within the error reporting machinery itself, and so we can definitely cause stack overflows:

a94483a5f2/compiler/rustc_trait_selection/src/solve/inspect/analyse.rs (L75-L84)

So instead, make `TraitEngine` and `ObligationCtxt` generic over `E: FulfillmentErrorLike<'tcx>`, and introduce a new `ScrubbedTraitError` which only stores whether the failure was due to a "true error" or an ambiguity. Then, introduce `ObligationCtxt::new_with_diagnostics` for the callsites that actually inspect their `FulfillmentError`s.

r? `@lcnr`

Number-wise, there are:
```
     39 ObligationCtxt::new
     32 ObligationCtxt::new_with_diagnostics
      1 ObligationCtxt::new_generic
```
calls to each `ObligationCtxt` constructor, which suggests that there are indeed a lot of callsites that don't care about diagnostics.
2024-06-03 15:43:06 +00:00
.github Add "Setup Python" action to github-hosted runners 2024-05-26 22:43:52 +00:00
.reuse std: move Once implementations to sys 2024-03-12 15:41:06 +01:00
compiler Nits and formatting 2024-06-03 10:02:08 -04:00
library Auto merge of #125912 - nnethercote:rustfmt-tests-mir-opt, r=oli-obk 2024-06-03 10:25:12 +00:00
LICENSES
src Opt-in diagnostics reporting to avoid doing extra work in the new solver 2024-06-03 09:27:52 -04:00
tests Auto merge of #125912 - nnethercote:rustfmt-tests-mir-opt, r=oli-obk 2024-06-03 10:25:12 +00:00
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.git-blame-ignore-revs Ignore compiletest test directive migration commits 2024-02-22 18:55:02 +00:00
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.gitignore Use cargo in y.sh 2024-05-12 12:59:10 +00:00
.gitmodules refactor: add rustc-perf submodule to src/tools 2024-05-20 14:56:49 +00:00
.mailmap Rollup merge of #123873 - cuviper:mailmap, r=lqd 2024-04-13 00:18:47 -04:00
Cargo.lock Auto merge of #125408 - chriskrycho:chriskrycho/book-updates, r=ehuss 2024-05-31 18:30:15 +00:00
Cargo.toml Remove the expand-yaml-anchors tool 2024-04-29 21:33:17 +02:00
CODE_OF_CONDUCT.md
config.example.toml Remove deprecated field dist.missing-tools 2024-05-25 10:35:07 +03:00
configure Ensure ./configure works when configure.py path contains spaces 2024-02-16 18:57:22 +00:00
CONTRIBUTING.md
COPYRIGHT
INSTALL.md chore: fix some comments 2024-03-27 22:32:53 +08:00
LICENSE-APACHE
LICENSE-MIT
README.md Use SVG logos in the README.md. 2024-04-03 19:48:20 +02:00
RELEASES.md release notes 1.78: add link to interior-mut breaking change 2024-05-03 14:56:05 +02:00
rust-bors.toml Increase timeout for new bors bot 2024-03-13 08:31:07 +01:00
rustfmt.toml rustfmt tests/mir-opt. 2024-06-03 14:17:16 +10:00
triagebot.toml Rollup merge of #125566 - camelid:notify-accepted, r=GuillaumeGomez 2024-05-26 15:28:29 -07:00
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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 integrate 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.