When I run (run* [q] (fresh [x] (== [x] ['z]) (== q x))), I get (z), which 
makes sense.

When I run (run* [q] (fresh [x] (== q x))), I get (_0), which makes sense 
since I've placed no restriction on x.

However, when I run (run* [q] (fresh [x] (== ['x] ['z]) (== q x))), I get 
(), which doesn't make sense to me. Obviously (== ['x] ['z]) is placing 
some sort of impossible constraint on x, but I can't tell what that 
constraint is actually doing.

Ultimately, what I want to be able to do is something along the lines of:

(def my-var '[x])
(run* [q] (fresh [x] (== my-var ['z]) (== q x)))

and get back (z) instead of ().

Note that the following produces (z) as desired:

(def my-other-var '[z]) 
(run* [q] (fresh [x] (== [x] my-other-var) (== q x)))

So it is only the passing in of the fresh variable that isn't working the 
way I would expect it to.

Any idea on what I can do to make this work?


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