message: Valgrind catch.
diff: @@ -246,8 +246,8 @@ int main(int argc, char *argv[])
  int skip_zeros = 0;
  k.Assemble(skip_zeros);
  k.Finalize(skip_zeros);
  - b.Assemble();
  }
  + b.Assemble();
  // 8. Define the initial conditions, save the corresponding grid function to
  // a file and (optionally) save data in the VisIt format and initialize
  