{"ast_node_type":"variable","tokens":[{"end":62,"kind":"keyword","start":0,"text":"if"}]}
        if let Some(item) = self.eat_metavar_seq_with_matcher(
    pub fn parse_attr_item(&mut self, force_collect: ForceCollect) -> PResult<'a, ast::AttrItem> {
            |mv_kind| matches!(mv_kind, MetaVarKind::Meta { .. }),