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diff --git a/vendor/icu_locid/src/extensions/private/mod.rs b/vendor/icu_locid/src/extensions/private/mod.rs
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+++ b/vendor/icu_locid/src/extensions/private/mod.rs
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+// 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 ).
+
+//! Private Use Extensions is a list of extensions intended for
+//! private use.
+//!
+//! Those extensions are treated as a pass-through, and no Unicode related
+//! behavior depends on them.
+//!
+//! The main struct for this extension is [`Private`] which is a list of [`Subtag`]s.
+//!
+//! # Examples
+//!
+//! ```
+//! use icu::locid::extensions::private::{Private, Subtag};
+//! use icu::locid::Locale;
+//!
+//! let mut loc: Locale = "en-US-x-foo-faa".parse().expect("Parsing failed.");
+//!
+//! let subtag: Subtag = "foo".parse().expect("Parsing subtag failed.");
+//! assert!(loc.extensions.private.contains(&subtag));
+//! assert_eq!(loc.extensions.private.iter().next(), Some(&subtag));
+//! loc.extensions.private.clear();
+//! assert_eq!(loc.to_string(), "en-US");
+//! ```
+
+mod other;
+
+use alloc::vec::Vec;
+use core::ops::Deref;
+
+pub use other::Subtag;
+
+use crate::parser::ParserError;
+use crate::parser::SubtagIterator;
+
+/// A list of [`Private Use Extensions`] as defined in [`Unicode Locale
+/// Identifier`] specification.
+///
+/// Those extensions are treated as a pass-through, and no Unicode related
+/// behavior depends on them.
+///
+/// # Examples
+///
+/// ```
+/// use icu::locid::extensions::private::{Private, Subtag};
+///
+/// let subtag1: Subtag = "foo".parse().expect("Failed to parse a Subtag.");
+/// let subtag2: Subtag = "bar".parse().expect("Failed to parse a Subtag.");
+///
+/// let private = Private::from_vec_unchecked(vec![subtag1, subtag2]);
+/// assert_eq!(&private.to_string(), "-x-foo-bar");
+/// ```
+///
+/// [`Private Use Extensions`]: https://unicode.org/reports/tr35/#pu_extensions
+/// [`Unicode Locale Identifier`]: https://unicode.org/reports/tr35/#Unicode_locale_identifier
+#[derive(Clone, PartialEq, Eq, Debug, Default, Hash, PartialOrd, Ord)]
+pub struct Private(Vec<Subtag>);
+
+impl Private {
+    /// Returns a new empty list of private-use extensions. Same as [`default()`](Default::default()), but is `const`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use icu::locid::extensions::private::Private;
+    ///
+    /// assert_eq!(Private::new(), Private::default());
+    /// ```
+    #[inline]
+    pub const fn new() -> Self {
+        Self(Vec::new())
+    }
+
+    /// A constructor which takes a pre-sorted list of [`Subtag`].
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use icu::locid::extensions::private::{Private, Subtag};
+    ///
+    /// let subtag1: Subtag = "foo".parse().expect("Failed to parse a Subtag.");
+    /// let subtag2: Subtag = "bar".parse().expect("Failed to parse a Subtag.");
+    ///
+    /// let private = Private::from_vec_unchecked(vec![subtag1, subtag2]);
+    /// assert_eq!(&private.to_string(), "-x-foo-bar");
+    /// ```
+    pub fn from_vec_unchecked(input: Vec<Subtag>) -> Self {
+        Self(input)
+    }
+
+    /// Empties the [`Private`] list.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use icu::locid::extensions::private::{Private, Subtag};
+    ///
+    /// let subtag1: Subtag = "foo".parse().expect("Failed to parse a Subtag.");
+    /// let subtag2: Subtag = "bar".parse().expect("Failed to parse a Subtag.");
+    /// let mut private = Private::from_vec_unchecked(vec![subtag1, subtag2]);
+    ///
+    /// assert_eq!(&private.to_string(), "-x-foo-bar");
+    ///
+    /// private.clear();
+    ///
+    /// assert_eq!(&private.to_string(), "");
+    /// ```
+    pub fn clear(&mut self) {
+        self.0.clear();
+    }
+
+    pub(crate) fn try_from_iter(iter: &mut SubtagIterator) -> Result<Self, ParserError> {
+        let keys = iter
+            .map(Subtag::try_from_bytes)
+            .collect::<Result<Vec<_>, _>>()?;
+
+        Ok(Self::from_vec_unchecked(keys))
+    }
+
+    pub(crate) fn for_each_subtag_str<E, F>(&self, f: &mut F) -> Result<(), E>
+    where
+        F: FnMut(&str) -> Result<(), E>,
+    {
+        if self.is_empty() {
+            return Ok(());
+        }
+        f("x")?;
+        self.deref().iter().map(|t| t.as_str()).try_for_each(f)
+    }
+}
+
+writeable::impl_display_with_writeable!(Private);
+
+impl writeable::Writeable for Private {
+    fn write_to<W: core::fmt::Write + ?Sized>(&self, sink: &mut W) -> core::fmt::Result {
+        if self.is_empty() {
+            return Ok(());
+        }
+        sink.write_str("-x")?;
+        for key in self.iter() {
+            sink.write_char('-')?;
+            writeable::Writeable::write_to(key, sink)?;
+        }
+        Ok(())
+    }
+
+    fn writeable_length_hint(&self) -> writeable::LengthHint {
+        if self.is_empty() {
+            return writeable::LengthHint::exact(0);
+        }
+        let mut result = writeable::LengthHint::exact(2);
+        for key in self.iter() {
+            result += writeable::Writeable::writeable_length_hint(key) + 1;
+        }
+        result
+    }
+}
+
+impl Deref for Private {
+    type Target = [Subtag];
+
+    fn deref(&self) -> &Self::Target {
+        self.0.deref()
+    }
+}