1 files changed, 31 insertions, 0 deletions
diff --git a/vendor/icu_locid/src/extensions/unicode/key.rs b/vendor/icu_locid/src/extensions/unicode/key.rs
new file mode 100644
index 000000000..bdfdd4e5c
--- /dev/null
+++ b/vendor/icu_locid/src/extensions/unicode/key.rs
@@ -0,0 +1,31 @@
+// 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 ).
+
+impl_tinystr_subtag!(
+    /// A key used in a list of [`Keywords`](super::Keywords).
+    ///
+    /// The key has to be a two ASCII alphanumerical characters long, with the first
+    /// character being alphanumeric, and the second being alphabetic.
+    ///
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use icu::locid::extensions::unicode::Key;
+    ///
+    /// assert!("ca".parse::<Key>().is_ok());
+    /// ```
+    Key,
+    extensions::unicode::Key,
+    extensions_unicode_key,
+    2..=2,
+    s,
+    s.all_bytes()[0].is_ascii_alphanumeric() && s.all_bytes()[1].is_ascii_alphabetic(),
+    s.to_ascii_lowercase(),
+    (s.all_bytes()[0].is_ascii_lowercase() || s.all_bytes()[0].is_ascii_digit())
+        && s.all_bytes()[1].is_ascii_lowercase(),
+    InvalidExtension,
+    ["ca", "8a"],
+    ["a", "a8", "abc"],
+);