Macro arg_kit::match_arg

macro_rules! match_arg {
    ($str:expr; $match:tt) => { ... };
}

Matches each part of a single argument - once if it’s a long argument (eg. --help), or for each character of combined short arguments (eg. -abc).

Expands to:

for arg in $str.as_arg() {
    match arg { $match }
}S