Macro seg 

macro_rules! seg {
    ($($a1:literal)?$($a2:ident)? - $($b1:literal)?$($b2:ident)?) => { ... };
    ($($a1:literal)?$($a2:ident)?) => { ... };
}

Generates a Seg (tuple of u32 values) from one or two values (characters or integers).

Example

assert_eq!(seg!('a'), Seg('a' as u32, 'a' as u32));
assert_eq!(seg!('0'-'9'), Seg('0' as u32, '9' as u32));