{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"for"}]}
            for (fn_ptr_ty, span) in self.find_fn_ptr_ty_with_external_abi(ret_hir, sig.output()) {
        if let hir::FnRetTy::Return(ret_hir) = decl.output {
                self.check_type_for_ffi_and_report_errors(span, fn_ptr_ty, false, true);