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-rw-r--r--src/libstd/sys/unix/time.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstd/sys/unix/time.rs b/src/libstd/sys/unix/time.rs
index 5192f01269d..9b093f60f03 100644
--- a/src/libstd/sys/unix/time.rs
+++ b/src/libstd/sys/unix/time.rs
@@ -98,6 +98,7 @@ mod inner {
         }
     }
 
+    #[unstable(feature = "libstd_sys_internals", issue = "0")]
     impl<'a> Sub for &'a SteadyTime {
         type Output = Duration;