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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.)