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- `AttributesData` -> `AttrsTarget` - `AttrTokenTree::Attributes` -> `AttrTokenTree::AttrsTarget` - `FlatToken::AttrTarget` -> `FlatToken::AttrsTarget`
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: