{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"FnDef(def_id,"}]}
            FnDef(def_id, args) if self.placeholder.is_none() => {
                Ty::new_fn_ptr(self.tcx, self.tcx.fn_sig(def_id).instantiate(self.tcx, args))