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-rw-r--r--src/libcore/unicode/version.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libcore/unicode/version.rs b/src/libcore/unicode/version.rs
index d82a749d917..59ebf5f5012 100644
--- a/src/libcore/unicode/version.rs
+++ b/src/libcore/unicode/version.rs
@@ -12,6 +12,7 @@
 ///
 /// See also: <http://www.unicode.org/versions/>
 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
+#[unstable(feature = "unicode_version", issue = "49726")]
 pub struct UnicodeVersion {
     /// Major version.
     pub major: u32,