print-let doesn't compose with loop/recur

Attempt to run the following toy example

```
(loop [n 10 res 0]
  (print-let [n2 (* n n )]
    (recur (dec n) (+ res n2))))
```

Gives the following result:

```
CompilerException java.lang.UnsupportedOperationException: Can only recur from tail position, ...
```
