You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: schema.rs
    path of file: ./repos/polars/crates/polars-arrow/src/io/ipc/read
    
    the code of the file until where you have to start completion: use arrow_format::ipc::planus::ReadAsRoot;
use arrow_format::ipc::{FieldRef, FixedSizeListRef, MapRef, Time
    
fn deserialize_list(field: FieldRef) -> PolarsResult<(ArrowDataType, IpcField)> {
    let children = field
        .children()?
        .ok_or_else(|| polars_err!(oos = "IPC: List must contain children"))?;
    let inner = children
        .get(0)
        .ok_or_else(|| polars_err!(oos = "IPC: List must contain one child"))??;
    let (field, ipc_field) = deserialize_field(inner)?;

    Ok((
        ArrowDataType::List(Box::new(field)),
        IpcField {
            fields: vec![ipc_field],
            dictionary_id: None,
        },
    ))
}