Reader#expect

[rapodaca]

Accepts a list of possible input sequences. Returns one of the following:

1. Ok(None) if the first character doesn't match any of the target first characters.
2. Ok(Some) if the full sequence matches one of those provided.
3. Err(Error) if part of a full sequence was matched.

pub fn expect(
    &mut self,
    expected: &'a [&'a [Character]],
) -> Result<Option<&'a [Character]>, Error> {
    todo!()
}