1 The `syntax` crate contains those things concerned purely with syntax
2 – that is, the AST ("abstract syntax tree"), parser, pretty-printer,
3 lexer, macro expander, and utilities for traversing ASTs.
5 For more information about how these things work in rustc, see the
8 - [Parsing](https://rust-lang-nursery.github.io/rustc-guide/the-parser.html)
9 - [Macro Expansion](https://rust-lang-nursery.github.io/rustc-guide/macro-expansion.html)