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["Garth N. Wells" <gnw20@xxxxxxxxx>]

I've run into a problem with zero coefficients. The code:

    mesh = UnitSquare(32, 32)

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

    # Source term
    f = 0.0

    # Linear form
    L = v*f*dx

    # Assemble and apply boundary conditions
    b = assemble(L)


gives an error since f = 0 which means that UFL eliminates it. I can get 
around it by doing

  f = Function(V, "0.0")

but that's not very satisfactory. It would work if I had some other term 
in the linear form which is non-zero. UFL should generate a 
representation for f = 0 if there are no other terms in the form.

Garth