Dolfin 1.6.0 and enriched function spaces

Question

I'm getting the error in fem::solving.py when solving the Stokes' equation with mini elements:

Traceback (most recent call last):
  File "demo_stokes-mini.py", line 66, in <module>
    solve(a == L, w, bcs)
  File "/usr/lib/python2.7/dist-packages/dolfin/fem/solving.py", line 297, in solve
    _solve_varproblem(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/dolfin/fem/solving.py", line 326, in _solve_varproblem
    solver.solve()
RuntimeError: evaluate_dof(s) for enriched element not implemented.

Code found here

Perhaps has something to do with this?