Function par_match

code/chapter03/par_checker2.rs:32–36

同时检测多种开闭符号是否匹配

(open: char, close: char)

// 同时检测多种开闭符号是否匹配
fn par_match(open: char, close: char) -> bool {
    let opens = "([{";
    let closers = ")]}";
    opens.find(open) == closers.find(close)
}

fn par_checker2(par: &str) -> bool {
    let mut char_list = Vec::new();