{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
                let old_ty = ty::EarlyBinder::bind(ty).instantiate(tcx, generic_args);
                // Normalize before comparing to see through type aliases and projections.
                let new_ty = ty::EarlyBinder::bind(ty).instantiate(tcx, new_args);