1# syn_codegen 2 3This is an internal (not published on crates.io) crate which is used to generate 4the files in the `gen/` directory of `syn`. It is used to ensure that the 5implementations for `Fold`, `Visit`, and `VisitMut` remain in sync with the 6actual AST. 7 8To run this program, run `cargo run` in this directory, and the `gen/` folder 9will be re-generated. 10 11This program is slow, and is therefore not run when building `syn` as part of 12the build script to save on compile time. 13