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-rw-r--r--src/libserialize/collection_impls.rs4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libserialize/collection_impls.rs b/src/libserialize/collection_impls.rs
index 7ba329c518e..d89a4754d2e 100644
--- a/src/libserialize/collection_impls.rs
+++ b/src/libserialize/collection_impls.rs
@@ -156,6 +156,7 @@ impl<
     }
 }
 
+#[old_impl_check]
 impl<
     K: Encodable + Hash<X> + Eq,
     V: Encodable,
@@ -175,6 +176,7 @@ impl<
     }
 }
 
+#[old_impl_check]
 impl<
     K: Decodable + Hash<S> + Eq,
     V: Decodable,
@@ -195,6 +197,7 @@ impl<
     }
 }
 
+#[old_impl_check]
 impl<
     T: Encodable + Hash<X> + Eq,
     X,
@@ -212,6 +215,7 @@ impl<
     }
 }
 
+#[old_impl_check]
 impl<
     T: Decodable + Hash<S> + Eq,
     S,