docs: public void onNodeFailed(final IExecutionNode node, final Throwable t) {
          // TODO do something with the exception
  
          if (node.equals(this.theLastNode)) {
              printFailed("FAILED: " + format(this.theLastNode));
          } else {
  
              // print the last one first
              if (this.theLastNode != null) {
                  printStarted("Starting: " + format(this.theLastNode));
              }
  
              printFailed("FAILED: " + format(node));
          }
          this.theLastNode = null;
      }