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-rw-r--r--src/libcore/unicode/tables.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libcore/unicode/tables.rs b/src/libcore/unicode/tables.rs
index 1f7b1bde914..3fbbc011bc4 100644
--- a/src/libcore/unicode/tables.rs
+++ b/src/libcore/unicode/tables.rs
@@ -17,6 +17,7 @@ use unicode::bool_trie::{BoolTrie, SmallBoolTrie};
 
 /// The version of [Unicode](http://www.unicode.org/) that the Unicode parts of
 /// `char` and `str` methods are based on.
+#[unstable(feature = "unicode_version", issue = "49726")]
 pub const UNICODE_VERSION: UnicodeVersion = UnicodeVersion {
     major: 10,
     minor: 0,