Function decode_unsafe 

pub fn decode_unsafe<I: Iterator<Item = Result<u8>>>(
    iter: &mut I,
) -> Option<Result<char>>

Read the next Unicode character out of the given Result<u8> iterator.

Returns None is the input iterator directly outputs None. Returns an InvalidData error the input iterator does not output a valid UTF-8 sequence. Returns an UnexpectedEof error if the input iterator returns None before the end of an UTF-8 character.