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a961e6785c
A new `HasTokens` trait is introduced, which is used to move logic from the callers of `collect_tokens` into the body of `collect_tokens`. In addition to reducing duplication, this paves the way for PR #80689, which needs to perform additional logic during token collection.
The rustc_ast crate contains those things concerned purely with syntax
– that is, the AST ("abstract syntax tree"), parser, pretty-printer,
lexer, macro expander, and utilities for traversing ASTs.
For more information about how these things work in rustc, see the rustc dev guide: