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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 162c3677168..2d56a8bcddf 100644
--- a/src/libstd/time/duration.rs
+++ b/src/libstd/time/duration.rs
@@ -334,7 +334,8 @@ impl Div<i32> for Duration {
     }
 }
 
-impl fmt::String for Duration {
+#[stable]
+impl fmt::Display for Duration {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         // technically speaking, negative duration is not valid ISO 8601,
         // but we need to print it anyway.