rustc-ap-syntax 166.0.0

Automatically published version of the package `syntax` in the rust-lang/rust repository from commit b907d966528a6859ec847a2a4d32f092a5be6584 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish

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: