added __impl__ constant to ctypes pq module

diff --git a/psycopg3/pq/pq_ctypes.py b/psycopg3/pq/pq_ctypes.py
index 6ffa6770750a608c3fd5dc7d1114d2d032ec9289..a267af136ee89add2c4fe071ca991f8f6586f7cb 100644 (file)
--- a/psycopg3/pq/pq_ctypes.py
+++ b/psycopg3/pq/pq_ctypes.py
@@ -29,6 +29,8 @@ from ..errors import OperationalError
 if TYPE_CHECKING:
     from psycopg3 import pq  # noqa
 
+__impl__ = "ctypes"
+
 
 def version() -> int:
     return impl.PQlibVersion()