rustc-ap-rustc_ast 658.0.0

Automatically published version of the package `rustc_ast` in the rust-lang/rust repository from commit 09c817eeb29e764cfc12d0a8d94841e3ffe34023 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish
Documentation 
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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:

- [Parsing](https://rustc-dev-guide.rust-lang.org/the-parser.html)
- [Macro Expansion](https://rustc-dev-guide.rust-lang.org/macro-expansion.html)