{"ast_node_type":"variable","tokens":[{"end":55,"kind":"keyword","start":0,"text":"let"}]}
            let fn_sig = self.resolve(fn_sig, &hir_id);
            let hir_id = HirId { owner: common_hir_owner, local_id };
            self.typeck_results.liberated_fn_sigs_mut().insert(hir_id, fn_sig);