{"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"match"}]}
        match (self.index(a), self.index(b)) {
    pub fn contains(&self, a: T, b: T) -> bool {
            (Some(a), Some(b)) => self.with_closure(|closure| closure.contains(a.0, b.0)),