Method wrapped_at

crates/vm/src/sliceable.rs:305–316

(&self, len: usize)

    }

    fn wrapped_at(&self, len: usize) -> Option<usize> {
        let mut p = *self;
        if p < 0 {
            // casting to isize is ok because it is used by wrapping_add
            p = p.wrapping_add(len as Self);
        }
        if p < 0 || (p as usize) >= len {
            None
        } else {
            Some(p as usize)
        }
    }
}

impl SequenceIndexOp for BigInt {