/usr/share/doc/python-ufl/demo/ShouldFail.ufl is in python-ufl-doc 2017.2.0.0-2.
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1 2 3 4 5 6 7 8 | # FIXME: This form passes validation but should fail since it mixes linear and bilinear terms.
e = FiniteElement("CG", triangle, 1)
f = Coefficient(e)
v = TestFunction(e)
u = TrialFunction(e)
a = f*v*dx + u*v*dx
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