Fixed timer usage inside basic_stream.

Closes #2602.

test/beast/core/tcp_stream.cpp

@@ -15,6 +15,12 @@
 namespace boost {
 namespace beast {
 
+// compile test for other exec
+template class basic_stream<
+        net::ip::tcp,
+        net::io_context::executor_type,
+        unlimited_rate_policy> ;
+
 class tcp_stream_test
     : public beast::unit_test::suite
 {