{"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"ty::FnPtr(sig_tys,"}]}
                ty::FnPtr(sig_tys, hdr) => cx
                // TODO(antoyo): find a less hackish way to handle the on-stack attribute.
                    .fn_ptr_backend_type(cx.fn_abi_of_fn_ptr(sig_tys.with(hdr), ty::List::empty())),