const fn r(first: char, last: char) -> Interval {
    Interval {
        first: first as u32,
        last: last as u32,
    }
}
/// Construct an interval from an inclusive range of char.
Construct an interval from an inclusive range of char.
Construct an interval from an inclusive range of char .
const fn r(first: char, last: char) -> Interval {
    Interval {
        first: first as u32,
        last: last as u32,
    }
}
const fn r ( first : char , last : char ) -> Interval { Interval { first : first as u32 , last : last as u32 , } }
Construct an interval from an inclusive range of char.
Construct an interval from an inclusive range of char .
first
char
last
char