change/API! ~ `disp_err!()` => `show_usage_error!()`
@@ -79,7 +79,7 @@ macro_rules! show_info(
);
#[macro_export]
-macro_rules! disp_err(
+macro_rules! show_usage_error(
($($args:tt)+) => ({
eprint!("{}: ", executable!());
eprintln!($($args)+);
