rust/compiler/rustc_ast
bors 4d88de2acd Auto merge of #125116 - blyxyas:ignore-allowed-lints-final, r=cjgillot
(Big performance change) Do not run lints that cannot emit

Before this change, adding a lint was a difficult matter because it always had some overhead involved. This was because all lints would run, no matter their default level, or if the user had `#![allow]`ed them. This PR changes that. This change would improve both the Rust lint infrastructure and Clippy, but Clippy will see the most benefit, as it has about 900 registered lints (and growing!)

So yeah, with this little patch we filter all lints pre-linting, and remove any lint that is either:
- Manually `#![allow]`ed in the whole crate,
- Allowed in the command line, or
- Not manually enabled with `#[warn]` or similar, and its default level is `Allow`

As some lints **need** to run, this PR also adds **loadbearing lints**. On a lint declaration, you can use the ``@eval_always` = true` marker to label it as loadbearing. A loadbearing lint will never be filtered (it will always run)

Fixes #106983
2024-10-26 16:37:43 +00:00
..
src Auto merge of #125116 - blyxyas:ignore-allowed-lints-final, r=cjgillot 2024-10-26 16:37:43 +00:00
Cargo.toml Pin memchr to 2.5.0 in the library rather than rustc_ast 2024-09-24 18:09:43 +02:00
README.md

The rustc_ast crate contains those things concerned purely with syntax that is, the AST ("abstract syntax tree"), along with some definitions for tokens and token streams, data structures/traits for mutating ASTs, and shared definitions for other AST-related parts of the compiler (like the lexer and macro-expansion).

For more information about how these things work in rustc, see the rustc dev guide: