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Several (doc) comments were super outdated or didn't provide enough context. Some doc comments shoved everything in a single paragraph without respecting the fact that the first paragraph should be a single sentence because rustdoc treats these as item descriptions / synopses on module pages.
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: