{"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"file.read_exact(&mut"}]}
        file.read_exact(&mut rustc_version_str_len)?;
        let mut rustc_version_str_len = [0u8; 1];
        let rustc_version_str_len = rustc_version_str_len[0] as usize;