{"ast_node_type":"variable","tokens":[{"end":29,"kind":"keyword","start":0,"text":"let"}]}
        let io = CompilerIO {
        let temps_dir = sessopts.unstable_opts.temps_dir.as_deref().map(PathBuf::from);
            input: Input::Str { name: FileName::Custom(String::new()), input: String::new() },