{"ast_node_type":"variable","tokens":[{"end":78,"kind":"keyword","start":0,"text":"let"}]}
        let mut child_trait = child_candidate.item.trait_container(self.tcx)?;
        let mut child_candidate = probes[0].0;
        let mut supertraits: SsoHashSet<_> = supertrait_def_ids(self.tcx, child_trait).collect();