Hi, I'm wondering if there is a good way to test if a given sequence
is lazy, and if so, how much of it has been evaluated.  I know the
fact that it is lazy should be transparent, but I'm thinking in the
context of unit testing knowing that could be valuable.  For instance
if you know a particular sequence could be particularly large or
expensive in certain situations, you may want your tests to assert
that it is not getting evaluated prematurely.

I suppose I could hack the generator function to cause a side effect
that I could test for, but is there an easier way?

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