Index: src/include/cassert
===================================================================
--- src/include/cassert	(revision 6a625dec0f64e84a53f9f54b9e3e180ce6265463)
+++ src/include/cassert	(revision 514a79107bae98b4aa4636858232b2de8a8a0ee3)
@@ -19,4 +19,9 @@
 
 #include_next <cassert>
+
+#include <string>
+
+template < typename ... Params >
+std::string toString( const Params & ... params );
 
 #ifdef NDEBUG