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[Garth Wells <663949@xxxxxxxxxxxxxxxxxx>]

Here's some simple code that moves one step backwards:

from dolfin import *
mesh = UnitSquare(2, 2)
V = FunctionSpace(mesh, "Lagrange", 1)
w = Function(V)

J = w*w*dx

#F = derivative(J, w, v)  # works
F = derivative(J, w)       # breaks

I = derivative(F, w) # works

** Changed in: dolfin
    Milestone: 1.0.0 => 0.9.10

** Changed in: dolfin
     Assignee: (unassigned) => Johan Hake (johan-hake)

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https://bugs.launchpad.net/bugs/663949

Title:
  Form assembly crashes for derivative without 3rd argument

Status in DOLFIN:
  Confirmed

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)