{"ast_node_type":"variable","tokens":[{"end":78,"kind":"keyword","start":0,"text":"let"}]}
        let (trait_def_id, trait_target_def_id) = if self.use_receiver_trait {
        // <ty as Deref>, or whatever the equivalent trait is that we've been asked to walk.
            (tcx.lang_items().receiver_trait()?, tcx.lang_items().receiver_target()?)