wrap_index without abs by youknowone · Pull Request #3769 · RustPython/RustPython
fn wrapped_at(&self, len: usize) -> Option<usize> { let neg = self.is_negative(); let p = self.unsigned_abs(); if neg { len.checked_sub(p) } else if p >= len { 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 isize); } if p < 0 || (p as usize) >= len { None } else { Some(p) Some(p as usize) } } }