role_type is in boost/beast/core/role.hpp (API Change):

This enumeration is now part of the library core and
not specific to websocket.

include/boost/beast/_experimental/test/impl/stream.hpp

@@ -392,7 +392,7 @@ async_write_some(
 template<class TeardownHandler>
 void
 async_teardown(
-    websocket::role_type,
+    role_type,
     stream& s,
     TeardownHandler&& handler)
 {

include/boost/beast/_experimental/test/impl/stream.ipp

@@ -255,7 +255,7 @@ close_remote()
 
 void
 teardown(
-    websocket::role_type,
+    role_type,
     stream& s,
     boost::system::error_code& ec)
 {