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Public bug reported:

To reproduce this bug, try compiling the hyperelasticity demo in UFL:

ffc HyperElasticity.ufl

Gives the following error message:

Visiting Variable: Variable(Sum(IntValue(1, (), (), {}), SpatialDerivative(Indexed(Function(VectorElement('Lagrange', Cell('tetrahedron', 1, Space(3)), 2, 3), 0), MultiIndex((FixedIndex(0),), {FixedIndex(0): 3})), MultiIndex((FixedIndex(0),), {}))), Label(0))
Variable is not supported (yet).
  
*** FFC: Variable is not supported (yet).
*** FFC: To get more information about this error, rerun FFC with --debug.

Fix suggested by Martin:

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.

** Affects: ffc
     Importance: Medium
         Status: New

** Changed in: ffc
   Importance: Undecided => Medium

-- 
UFL Variable not supported
https://bugs.launchpad.net/bugs/426498
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Status in FEniCS Form Compiler: New

Bug description:
To reproduce this bug, try compiling the hyperelasticity demo in UFL:

ffc HyperElasticity.ufl

Gives the following error message:

Visiting Variable: Variable(Sum(IntValue(1, (), (), {}), SpatialDerivative(Indexed(Function(VectorElement('Lagrange', Cell('tetrahedron', 1, Space(3)), 2, 3), 0), MultiIndex((FixedIndex(0),), {FixedIndex(0): 3})), MultiIndex((FixedIndex(0),), {}))), Label(0))
Variable is not supported (yet).
  
*** FFC: Variable is not supported (yet).
*** FFC: To get more information about this error, rerun FFC with --debug.

Fix suggested by Martin:

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.