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[Johan Hake <663949@xxxxxxxxxxxxxxxxxx>]

What would the different cases be:

  mesh = UnitSquare(1, 1)
  V = FunctionSpace(mesh, "CG", 1)
  u = Function(V)
  v = TestFunction(V)

  1) derivative(u*v*dx, u)
  2) derivative(u*dx, u)
  3) ?

I am positive that 1 and 2 can be solved with a dolfin.derivative.

Johan

-- 
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)