macro_rules! w { ($buf:expr, $to_w:expr) => { match $buf.write_all($to_w) { Ok(..) => (), Err(..) => panic!("Failed to write to generated file"), } }; } #[cfg(feature = "debug")] macro_rules! debug { ($($arg:tt)*) => { print!("[{:>w$}] \t", module_path!(), w = 28); println!($($arg)*) } } #[cfg(not(feature = "debug"))] macro_rules! debug { ($($arg:tt)*) => {}; }