3 files changed, 12 insertions, 8 deletions
diff --git a/lib/sqlalchemy/pool/base.py b/lib/sqlalchemy/pool/base.py
index e2ed53800..8a3abb82f 100644
--- a/lib/sqlalchemy/pool/base.py
+++ b/lib/sqlalchemy/pool/base.py
@@ -53,14 +53,16 @@ class _ConnDialect(object):
         )
 
 
+class _AsyncConnDialect(_ConnDialect):
+    is_async = True
+
+
 class Pool(log.Identified):
 
     """Abstract base class for connection pools."""
 
     _dialect = _ConnDialect()
 
-    _is_asyncio = False
-
     def __init__(
         self,
         creator,
@@ -196,6 +198,10 @@ class Pool(log.Identified):
             for fn, target in events:
                 event.listen(self, target, fn)
 
+    @util.hybridproperty
+    def _is_asyncio(self):
+        return self._dialect.is_async
+
     @property
     def _creator(self):
         return self.__dict__["_creator"]
diff --git a/lib/sqlalchemy/pool/impl.py b/lib/sqlalchemy/pool/impl.py
index 730293273..99d0c94d2 100644
--- a/lib/sqlalchemy/pool/impl.py
+++ b/lib/sqlalchemy/pool/impl.py
@@ -13,7 +13,7 @@
 import traceback
 import weakref
 
-from .base import _ConnDialect
+from .base import _AsyncConnDialect
 from .base import _ConnectionFairy
 from .base import _ConnectionRecord
 from .base import Pool
@@ -34,6 +34,7 @@ class QueuePool(Pool):
 
     """
 
+    _is_asyncio = False
     _queue_class = sqla_queue.Queue
 
     def __init__(
@@ -222,10 +223,6 @@ class QueuePool(Pool):
         return self._pool.maxsize - self._pool.qsize() + self._overflow
 
 
-class _AsyncConnDialect(_ConnDialect):
-    is_async = True
-
-
 class AsyncAdaptedQueuePool(QueuePool):
     _is_asyncio = True
     _queue_class = sqla_queue.AsyncAdaptedQueue
@@ -307,6 +304,8 @@ class SingletonThreadPool(Pool):
 
     """
 
+    _is_asyncio = False
+
     def __init__(self, creator, pool_size=5, **kw):
         Pool.__init__(self, creator, **kw)
         self._conn = threading.local()
diff --git a/lib/sqlalchemy/util/langhelpers.py b/lib/sqlalchemy/util/langhelpers.py
index 1308ee7e0..e506b7529 100644
--- a/lib/sqlalchemy/util/langhelpers.py
+++ b/lib/sqlalchemy/util/langhelpers.py
@@ -1440,7 +1440,6 @@ class hybridproperty(object):
     def __get__(self, instance, owner):
         if instance is None:
             clsval = self.clslevel(owner)
-            clsval.__doc__ = self.func.__doc__
             return clsval
         else:
             return self.func(instance)