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If you use the syntax in r.annihilator? then it makes it one step further:

sage: r.annihilator([2,-3,-4])
...
AttributeError: 'FreeModule_submodule_field_with_category' object has no attribute 'from_vector'

But I think you meant one vector, not three rationals, so that isn't helpful. I have opened Trac 21742 for this; I suspect this simply isn't a case where this was intended to be used.