Function html_minifier::js::clean_token_except

pub fn clean_token_except<'a, F>(
    token: &Token<'a>, 
    next_token: &Option<&Token>, 
    f: &F
) -> bool where
    F: Fn(&Token<'a>) -> bool, 

Returns true if the token is a "useful" one (so not a comment or a "useless" character).