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The `syntax` 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 guide:
- [Parsing](https://rust-lang-nursery.github.io/rustc-guide/the-parser.html)
- [Macro Expansion](https://rust-lang-nursery.github.io/rustc-guide/macro-expansion.html)
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