{"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"self.tcx().liberate_late_bound_regions(expr_def_id.to_def_id(),"}]}
            self.tcx().liberate_late_bound_regions(expr_def_id.to_def_id(), bound_sig);
        let liberated_sig =
        let liberated_sig = self.normalize(self.tcx.def_span(expr_def_id), liberated_sig);