Index: libcfa/src/concurrency/io/setup.cfa
===================================================================
--- libcfa/src/concurrency/io/setup.cfa	(revision c44d652392ec3f3a7136105ca29b9a54bd9d98bd)
+++ libcfa/src/concurrency/io/setup.cfa	(revision d3a518c4e9e6284103a9706fc3fd93ceee932d6b)
@@ -29,4 +29,6 @@
 	}
 
+	void ?{}(io_context_params & this) {}
+
 	void ?{}(io_context & this, struct cluster & cl) {}
 	void ?{}(io_context & this, struct cluster & cl, const io_context_params & params) {}