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: ids.rs
    path of file: ./repos/icu4x/components/experimental/src/transliterate
    
    the code of the file until where you have to start completion: // This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).

use icu_locid::Locale;
use icu_prov
    
pub fn unparsed_bcp47_to_data_locale(dep: &str) -> Result<DataLocale, DataError> {
    let mut data_locale = DataLocale::default();
    data_locale.set_aux(AuxiliaryKeys::try_from_iter(
        dep.split('-')
            .map(str::parse)
            // TODO: Bubble a potential subtag parse error out. Currently
            // we ignore it inside of the `filter_map`.
            .filter_map(Result::ok),
    )?);
    Ok(data_locale)
}