850     int tmp = -1;  variable
851     CHECK_MESSAGE((src.try_get(tmp) == false), "try_get can not succeed");
854     tmp = -1;
855     CHECK_MESSAGE((src.try_get(tmp) == false), "try_get can not succeed");
891     int tmp = -1;  variable
892     CHECK_MESSAGE((q.try_get(tmp) == false), "Message should not be passed on");
941     int tmp = -1;  variable
942     CHECK_MESSAGE((b.try_get(tmp) == false), "Message should not arrive");
943     CHECK_MESSAGE((tmp == -1), "Value should not be altered");
968     int tmp = -1;  variable
969     CHECK_MESSAGE((b.try_get(tmp) == true), "Functional nodes can work in succession");
970     CHECK_MESSAGE((tmp == 1), "Value should not be altered");