{"ast_node_type":"other","tokens":[{"end":3,"kind":"keyword","start":0,"text":")"}]}
) {
    f: &dyn Fn(&mut FunctionCx<'_, '_, 'tcx>, Value, Value) -> Value,
    let (lane_count, _lane_ty) = val.layout().ty.simd_size_and_type(fx.tcx);