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-rw-r--r--synapse/util/caches/cached_call.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/util/caches/cached_call.py b/synapse/util/caches/cached_call.py
index e58dd91eda..470f4f91a5 100644
--- a/synapse/util/caches/cached_call.py
+++ b/synapse/util/caches/cached_call.py
@@ -85,7 +85,7 @@ class CachedCall(Generic[TV]):
             # result in the deferred, since `awaiting` a deferred destroys its result.
             # (Also, if it's a Failure, GCing the deferred would log a critical error
             # about unhandled Failures)
-            def got_result(r):
+            def got_result(r: Union[TV, Failure]) -> None:
                 self._result = r
 
             self._deferred.addBoth(got_result)