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9d733eca06
Allow boolean literals in `check-cfg` https://github.com/rust-lang/rust/pull/138632#issuecomment-2738114495 This makes it consistent with `--cfg` We could alternatively add a forward-compatible lint against `--cfg true/false` r? `@Urgau`
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: