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[Anders Logg <logg@xxxxxxxxx>]

Form.cell_domains has recently been added in the development version. This error indicates that you are running a demo
from the development version of DOLFIN with an older installed version of DOLFIN. Update to the latest development version and it should work.

** Changed in: dolfin
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/754860

Title:
  assign_domains fails

Status in DOLFIN:
  Invalid

Bug description:
  I get the following error when running the cahn-hilliard demo and my
  own scripts.

  python demo_cahn-hilliard.py 
  Calling FFC just-in-time (JIT) compiler, this may take some time.
  Calling FFC just-in-time (JIT) compiler, this may take some time.
  Traceback (most recent call last):
    File "demo_cahn-hilliard.py", line 84, in <module>
      a = derivative(L, u, du)
    File "/usr/local/lib/python2.6/dist-packages/dolfin/fem/formmanipulations.py", line 17, in derivative
      assign_domains(fro=form, to=a)
    File "/usr/local/lib/python2.6/dist-packages/dolfin/fem/formmanipulations.py", line 9, in assign_domains
      to.cell_domains = fro.cell_domains
  AttributeError: 'Form' object has no attribute 'cell_domains'