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[Garth Wells <663949@xxxxxxxxxxxxxxxxxx>]

I'm not sure what's being reported here. Would you expect a more
informative error? To me it's correct that an error is thrown since in
UFL 'derivative' -> directional derivative.

-- 
Form assembly crashes for derivative without 3rd argument
https://bugs.launchpad.net/bugs/663949
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Status in DOLFIN: New

Bug description:

Reproduce with:

mesh = UnitSquare(1, 1)
V = FunctionSpace(mesh, "CG", 1)
u = Function(V)
v = TestFunction(V)
F = u*v*dx
a = derivative(F, u)
A = assemble(a)