Another example of regex stumping on tokens

[porkbrain]

This is a dupe of #377, but I thought to post it nonetheless as an extra test case for #265.

    use logos::Logos;

    #[derive(Logos, Debug, PartialEq, Eq)]
    #[logos(skip r"[ \t\f]+")]
    enum FooToken {
        #[token("fast", priority = 999999)]
        SomeToken,
        #[regex(r#"[a-z0-9_/]+ = "#)]
        RegexThatShouldNotMatch,
    }

    #[test]
    fn it_does_not_ignore_token() {
        let mut lex = FooToken::lexer("[fast ");

        let _first_goes_the_bracket = lex.next().unwrap();
        assert_eq!("[", lex.slice());

        let second_match = lex.next().unwrap();

        assert_eq!("fast", lex.slice());
        assert_eq!(Ok(FooToken::SomeToken), second_match); // <--- incorrectly results in `Err(())`
    }