Function upper_unicode

crates/sre_engine/src/string.rs:461–466

(ch: u32)

}
#[inline]
pub fn upper_unicode(ch: u32) -> u32 {
    // TODO: check with cpython
    char::try_from(ch)
        .map(|x| x.to_uppercase().next().unwrap() as u32)
        .unwrap_or(ch)
}