DeclExceptionMsg(ExcNotImplemented, "You are trying to use functionality in ExaDG that is " "currently not implemented. In many cases, this indicates " "that there simply didn't appear much of a need for it, or " "that the author of the original code did not have the " "time to implement a particular case. If you hit this " "exception, it is therefore worth the time to look into " "the code to find out whether you may be able to " "implement the missing functionality. If you do, please " "consider providing a patch to the ExaDG development " "sources (see the ExaDG Wiki page on how to contribute).")