{"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"abi:"}]}
    abi: Result<&'tcx FnAbi<'tcx, Ty<'tcx>>, &'tcx FnAbiError<'tcx>>,
fn unwrap_fn_abi<'tcx>(
    tcx: TyCtxt<'tcx>,