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[Martin Sandve Alnæs <martinal@xxxxxxxxx>]

The example
a = inner(v,u)*dx + inner(V,U)*dx
should now fail in validate_form(a).

However, we still have the bug or feature:

v1 = TestFunction(element)
v2 = TestFunction(element)

v1 == v2 # True
a = (v1+v2) # => 2*v1

The only way to fix it that I see is to make
"v1 == v2" return False, that is to implement
BasisFunction.__eq__ as "return self is other".
This isn't quite what we want either, so I'm
inclined to just see this as an obscure
issue that will never occur in practice.

Martin