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-rw-r--r--src/libstd/time/duration.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libstd/time/duration.rs b/src/libstd/time/duration.rs
index d16fa83c2af..2135b851032 100644
--- a/src/libstd/time/duration.rs
+++ b/src/libstd/time/duration.rs
@@ -64,7 +64,8 @@ impl Duration {
     #[unstable(feature = "duration_span",
                reason = "unsure if this is the right API or whether it should \
                          wait for a more general \"moment in time\" \
-                         abstraction")]
+                         abstraction",
+               issue = "27799")]
     pub fn span<F>(f: F) -> Duration where F: FnOnce() {
         let start = SteadyTime::now();
         f();