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[Garth Wells <gnw20@xxxxxxxxx>]

I've added something like this as a DOLFIN unit test,

    http://bazaar.launchpad.net/~dolfin-core/dolfin/main/revision/4777

** Changed in: dolfin
       Status: Confirmed => Fix Committed

-- 
tabulate_dofs gives incorrect results for mixed-mixed function spaces
https://bugs.launchpad.net/bugs/586533
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Status in DOLFIN: Fix Committed

Bug description:

There seems to be a bug in tabulate_dofs for mixed-mixed function spaces. (It might 
have to do with the applied offset.)

This only shows up for mixed spaces where the non-first element is also a mixed element.

* Example: 

** Output:

dofs for W.sub(0) =  [0 1 3]
dofs for W.sub(1).sub(0) =  [0 1 3]
dofs for W.sub(1).sub(1) =  [4 5 7]
dofs for W.sub(1) =  [ 4  5  7  8  9 11]

** Input:

from dolfin import *
import numpy

mesh = UnitSquare(1, 1)

V = FunctionSpace(mesh, "CG", 1)
Q = VectorFunctionSpace(mesh, "CG", 1)
W = V * Q

dofs = numpy.array((0,)*3, dtype="I")
for cell in cells(mesh):
    W.sub(0).dofmap().tabulate_dofs(dofs, cell)
    print "dofs for W.sub(0) = ", dofs

    L = W.sub(1)
    L.sub(0).dofmap().tabulate_dofs(dofs, cell)
    print "dofs for W.sub(1).sub(0) = ", dofs

    L.sub(1).dofmap().tabulate_dofs(dofs, cell)
    print "dofs for W.sub(1).sub(1) = ", dofs

    dofs = numpy.array((0,)*6, dtype="I")
    L.dofmap().tabulate_dofs(dofs, cell)
    print "dofs for W.sub(1) = ", dofs
    exit()