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5ebcbfc1e1
It's a "utility trait to reduce boilerplate" implemented for `P` and `AstNodeWrapper`, but removing it gives a net reduction of twenty lines of code. It's also simpler to just implement `HasNodeId`/`HasAttrs`/`HasTokens` directly on types instead of via `AstDeref`. (I decided to make this change when doing some related refactoring and the error messages involving `AstDeref` and `HasAttrs` were hard to understand; removing it helped a lot.)
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: