fix: use sub-unification roots in type_var_is_sized When checking whether an inference variable is Sized (used during unsize coercions), ype_var_is_sized previously compared equality-only roots via oot_var. This meant that a Sized obligation on a variable related through subtyping (e.g. from Box::new(y) unsized to Box<dyn Send>) was missed, causing spurious type mismatches. Thread a UseSubtyping flag (modeled on rust-lang/rust#157820) through obligations_for_self_ty, predicate_has_self_ty, and ype_matches_expected_vid. ype_var_is_sized passes Yes (since sizedness is preserved under subtyping), while all closure callers pass No. Fixes #23114
rust-analyzer is a language server that provides IDE functionality for writing Rust programs. You can use it with any editor that supports the Language Server Protocol (VS Code, Vim, Emacs, Zed, etc).
rust-analyzer features include go-to-definition, find-all-references, refactorings and code completion. rust-analyzer also supports integrated formatting (with rustfmt) and integrated diagnostics (with rustc and clippy).
Internally, rust-analyzer is structured as a set of libraries for analyzing Rust code. See Architecture in the manual.
https://rust-analyzer.github.io/book/installation.html
If you want to contribute to rust-analyzer check out the CONTRIBUTING.md or if you are just curious about how things work under the hood, see the Contributing section of the manual.
If you want to use rust-analyzer's language server with your editor of choice, check the manual. It also contains some tips & tricks to help you be more productive when using rust-analyzer.
See the security and privacy sections of the manual.
For usage and troubleshooting requests, please use “IDEs and Editors” category of the Rust forum:
https://users.rust-lang.org/c/ide/14
For questions about development and implementation, join rust-analyzer working group on Zulip:
https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Frust-analyzer
rust-analyzer is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0).
See LICENSE-APACHE and LICENSE-MIT for details.