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-rw-r--r--src/libcollections/string.rs7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/libcollections/string.rs b/src/libcollections/string.rs
index 9a985061ebb..4c82e2e2e7e 100644
--- a/src/libcollections/string.rs
+++ b/src/libcollections/string.rs
@@ -1990,6 +1990,13 @@ pub struct Drain<'a> {
     iter: Chars<'a>,
 }
 
+#[stable(feature = "collection_debug", since = "1.17.0")]
+impl<'a> fmt::Debug for Drain<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.pad("Drain { .. }")
+    }
+}
+
 #[stable(feature = "drain", since = "1.6.0")]
 unsafe impl<'a> Sync for Drain<'a> {}
 #[stable(feature = "drain", since = "1.6.0")]