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-rw-r--r--src/libcore/ops.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libcore/ops.rs b/src/libcore/ops.rs
index c382ac46d5d..4116d8be9fb 100644
--- a/src/libcore/ops.rs
+++ b/src/libcore/ops.rs
@@ -913,6 +913,7 @@ shr_impl_all! { u8 u16 u32 u64 usize i8 i16 i32 i64 isize }
 #[stable(feature = "rust1", since = "1.0.0")]
 pub trait Index<Idx: ?Sized> {
     /// The returned type after indexing
+    #[stable(feature = "rust1", since = "1.0.0")]
     type Output: ?Sized;
 
     /// The method for the indexing (`Foo[Bar]`) operation