Async connect operations using the reactor should not allow speculative
completion.

asio/include/asio/detail/reactive_socket_service.hpp

diff --git a/asio/include/asio/detail/reactive_socket_service.hpp b/asio/include/asio/detail/reactive_socket_service.hpp
index 6798d5f..ea17b94 100644
--- a/asio/include/asio/detail/reactive_socket_service.hpp
+++ b/asio/include/asio/detail/reactive_socket_service.hpp
@@ -1713,7 +1713,7 @@
           {
             op->ec_ = asio::error_code();
             reactor_.start_op(reactor::connect_op,
-                impl.socket_, impl.reactor_data_, op, true);
+                impl.socket_, impl.reactor_data_, op, false);
             return;
           }
         }