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-rw-r--r--src/libstd/sys/windows/time.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstd/sys/windows/time.rs b/src/libstd/sys/windows/time.rs
index 4dc7997d22e..707e8c05e17 100644
--- a/src/libstd/sys/windows/time.rs
+++ b/src/libstd/sys/windows/time.rs
@@ -39,6 +39,7 @@ fn frequency() -> c::LARGE_INTEGER {
     }
 }
 
+#[unstable(feature = "libstd_sys_internals", issue = "0")]
 impl<'a> Sub for &'a SteadyTime {
     type Output = Duration;