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-rw-r--r--synapse/server.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/server.py b/synapse/server.py
index c78eb2fe46..9055b97ac3 100644
--- a/synapse/server.py
+++ b/synapse/server.py
@@ -163,6 +163,8 @@ def cache_in_self(builder: T) -> T:
 
         return dep
 
+    # We cast here as we need to tell mypy that `_get` has the same signature as
+    # `builder`.
     return cast(T, _get)