Macro awint_internals::subdigits_mut

macro_rules! subdigits_mut {
    ($bits:ident, $range:expr, $subbits:ident, $f:block) => { ... };
}

Runs f on a digitwise subslice subbits of bits. This is a macro because closures are not properly supported in const functions yet.

Safety

range must satisfy range.start <= range.end and range.end <= self.len()