eck is optional, and cannot be relied on for safety.assertion failed: self.is_special()unsafe precondition(s) violated: NonZero::new_unchecked requires the argument to be non-zero

This indicates a bug in the program. This Undefined Behavior check is optional, and cannot be relied on for safety.is_nonoverlapping: `size_of::<T>() * count` overflows a usizerange start index  out of range for slice of length  should be <= range end index