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-rw-r--r--src/libcore/char.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libcore/char.rs b/src/libcore/char.rs
index 21146f98360..525f9490b17 100644
--- a/src/libcore/char.rs
+++ b/src/libcore/char.rs
@@ -152,6 +152,9 @@ pub trait CharExt {
     fn encode_utf16(self, dst: &mut [u16]) -> Option<usize>;
 }
 
+#[unstable(feature = "core_char_ext",
+           reason = "the stable interface is `impl char` in later crate",
+           issue = "27701")]
 impl CharExt for char {
     #[inline]
     fn is_digit(self, radix: u32) -> bool {