message: Compilation error in the diffusion example due to the interface change.
diff: @@ -336,7 +336,7 @@ int main(int argc, char *argv[])
  }
  HeatDistanceSolver dist_func(2.0 * dx * dx);
  - dist_func.print_level = 1;
  + dist_func.print_level.FirstAndLast().Summary();
  dist_func.smooth_steps = 1;
  dist_func.ComputeVectorDistance(ls_filt_coeff, distance);
  dist_vec = new VectorGridFunctionCoefficient(&distance);
  