Please check the build logs and, if you believe this is docs.rs' fault, open an issue.
NB: This crate is part of the Rust compiler. For an overview of the
compiler as a whole, see
the README.md file found in
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.