{"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let"}]}
        let lower_rest_sub = |this: &mut Self, pat: &Pat, &ann, &ident, sub: &Pat| {
        // Lowers `$bm $ident @ ..` to `$bm $ident @ _`.
            let sub_hir_id = this.lower_node_id(sub.id);