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-rw-r--r--synapse/util/caches/expiringcache.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/util/caches/expiringcache.py b/synapse/util/caches/expiringcache.py
index cbdde34a57..6ad53a6390 100644
--- a/synapse/util/caches/expiringcache.py
+++ b/synapse/util/caches/expiringcache.py
@@ -94,6 +94,9 @@ class ExpiringCache(object):
 
         return entry.value
 
+    def __contains__(self, key):
+        return key in self._cache
+
     def get(self, key, default=None):
         try:
             return self[key]