Function rustc_error_messages::fluent_bundle

pub fn fluent_bundle(
    user_provided_sysroot: Option<PathBuf>,
    sysroot_candidates: Vec<PathBuf>,
    requested_locale: Option<LanguageIdentifier>,
    additional_ftl_path: Option<&Path>,
    with_directionality_markers: bool,
) -> Result<Option<Lrc<FluentBundle>>, TranslationBundleError>

Returns Fluent bundle with the user’s locale resources from $sysroot/share/locale/$requested_locale/*.ftl.

If -Z additional-ftl-path was provided, load that resource and add it to the bundle (overriding any conflicting messages).