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6b47c6d786
Unify FnKind between AST visitors and make WalkItemKind more straight forward Unifying `FnKind` requires a bunch of changes to `WalkItemKind::walk` signature so I'll change them in one go related to #128974 r? `@petrochenkov`
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: