{"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":".type_dependent_def_id(expr.hir_id)"}]}
                .type_dependent_def_id(expr.hir_id)
                .borrow()
                .map(|def_id| self.tcx.fn_sig(def_id).skip_binder().skip_binder())