Function compare_os_str 

pub fn compare_os_str<A: AsRef<OsStr>, B: AsRef<OsStr>>(a: A, b: B) -> Ordering

Available on crate feature std only.

Compare two OsStr.

The alphanumeric algorithm is used only when both values can be converted to UTF-8 with OsStr::to_str. If either value cannot be converted, this falls back to the native OsStr ordering.