{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"(caller_abi,"}]}
        (caller_abi, caller_fn_abi): (ExternAbi, &FnAbi<'tcx, Ty<'tcx>>),
        fn_val: FnVal<'tcx, M::ExtraFnVal>,
        args: &[FnArg<'tcx, M::Provenance>],