Expand description
Implement NonZeroChar, like NonZeroU32
use nonzero_char::NonZeroChar;
assert_eq!(NonZeroChar::new('a').unwrap(), 'a');
assert_eq!(NonZeroChar::new('\0'), None);Null Pointer Optimization:
use nonzero_char::NonZeroChar;
assert_eq!(size_of::<NonZeroChar>(), size_of::<Option<NonZeroChar>>());