libsyntax uses several tools to help with development.
Each tool is a binary in the tools/ package.
You can run them via cargo run command.
cargo run --package tools --bin tool
There are also aliases in ./cargo/config, so the following also works:
cargo tool
This tool reads a "grammar" from grammar.ron and
generates the syntax_kinds.rs file. You should run this tool if you
add new keywords or syntax elements.
This tool reads rust source code from the standard input, parses it, and prints the result to stdout.