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[Martin Sandve Alnæs <martinal@xxxxxxxxx>]

Visiting Variable:
Variable(Sum(Division(Power(SpatialDerivative(Function(FiniteElement('Lagrange',
Cell('interval', 1), 2), 0), MultiIndex((FixedIndex(0),))),
IntValue(2, (), (), {})), IntValue(2, (), (), {})),
SpatialDerivative(Function(FiniteElement('Lagrange', Cell('interval',
1), 2), 0), MultiIndex((FixedIndex(0),)))), Label(0))
Variable is not supported (yet).
*** Variable is not supported (yet).
*** To get more information about this error, rerun ffc with the option -d1.
[1]+  Done                    gvim ../HyperElasticity1D.ufl


You can either just treat a variable v as if it were v.expression(),
or call "form = strip_variables(form)" to get rid of them.

Martin