{"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"ty::Infer(ty::TyVar(vid))"}]}
            ty::Infer(ty::TyVar(vid)) => self.deduce_closure_signature_from_predicates(
            }
                Ty::new_var(self.tcx, self.root_var(vid)),