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-rw-r--r--synapse/util/caches/expiringcache.py10
1 files changed, 6 insertions, 4 deletions
diff --git a/synapse/util/caches/expiringcache.py b/synapse/util/caches/expiringcache.py
index c3f72aa06d..6a7e534576 100644
--- a/synapse/util/caches/expiringcache.py
+++ b/synapse/util/caches/expiringcache.py
@@ -19,6 +19,8 @@ from typing import Any, Generic, Optional, TypeVar, Union, overload
 import attr
 from typing_extensions import Literal
 
+from twisted.internet import defer
+
 from synapse.config import cache as cache_config
 from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.util import Clock
@@ -81,7 +83,7 @@ class ExpiringCache(Generic[KT, VT]):
             # Don't bother starting the loop if things never expire
             return
 
-        def f():
+        def f() -> "defer.Deferred[None]":
             return run_as_background_process(
                 "prune_cache_%s" % self._cache_name, self._prune_cache
             )
@@ -210,7 +212,7 @@ class ExpiringCache(Generic[KT, VT]):
         return False
 
 
-@attr.s(slots=True)
+@attr.s(slots=True, auto_attribs=True)
 class _CacheEntry:
-    time = attr.ib(type=int)
-    value = attr.ib()
+    time: int
+    value: Any