charred 2.2.0

charred char checking
Documentation 
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use crate::error::TapeResult;
use crate::input_reader::InputReader;
use crate::token::Token;
use std::io::Cursor;

#[derive(Debug)]
struct TestToken(i32);

async fn parse_test_token(reader: &mut InputReader) -> TapeResult<Option<Token>> {
    let mut num = String::new();
    while !reader.check_eof().await && reader.peek().await?.is_numeric() {
        num.push(reader.consume().await?);
    }
    if num.is_empty() {
        Ok(None)
    } else {
        Ok(Some(Token::new(TestToken(num.parse::<i32>().unwrap()))))
    }
}

#[tokio::test]
async fn it_parses() {
    let mut reader = InputReader::new(Cursor::new("128"));
    let token = parse_test_token(&mut reader).await.unwrap();
    assert!(token.is_some());
    let token = token.unwrap().try_into::<TestToken>().unwrap();
    assert_eq!(token.0, 128);

    let mut reader = InputReader::new(Cursor::new("string a12 24\n"));
    let token = parse_test_token(&mut reader).await.unwrap();
    assert!(token.is_none());
    reader.seek_to(8).await.unwrap();

    let token = parse_test_token(&mut reader).await.unwrap();
    assert!(token.is_some());
    let token = token.unwrap().try_into::<TestToken>().unwrap();
    assert_eq!(token.0, 12);
}

#[test]
fn it_converts() {
    let token = Token::new(TestToken(12));
    assert!(token.is::<TestToken>());

    let test_token = token.try_as::<TestToken>();
    assert!(test_token.is_some());
    assert_eq!(test_token.unwrap().0, 12);

    let test_token = token.try_into::<TestToken>();
    assert!(test_token.is_some());
    assert_eq!(test_token.unwrap().0, 12);
}