Stuart Cook
ec4e6e6559
don't completely reset `HeadUsages` This is really subtle ☠️ I've actually went and added testing for `search_graph.ignore_candidate_head_usages` to https://github.com/lcnr/search_graph_fuzz now. I should have done that when I originally implemented but didn't quite know how to do so back then. The search graph is far too subtle to think through it manually. I've added the affected proof tree to https://github.com/rust-lang/trait-system-refactor-initiative/blob/main/notes/next-solver/search-graph/general.md#keeping-provisional-cache-entries-on-rerun. It's - A - B - C (depends on B and gets dropped when rerunning) - D (does not depend on B so we keep it around when rerunning) - C (irrevant candidate) - A - B - D - C (irrevant candidate) - D - A - rerun - C (use provisional cache entry which doesn't depend on B) - D (use provisional cache entry which doesn't depend on B) Fixes the ICE in https://github.com/rust-lang/trait-system-refactor-initiative/issues/246#issuecomment-3497832902. I think this issue is brittle enough that adding that as a test isn't really useful. Any small change to the search graph will prevent it from testing this. We do test this fix via the fuzzer. r? `````@BoxyUwU`````
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 Rust language trademark policy.
Third-party logos may be subject to third-party copyrights and trademarks. See Licenses for details.