Use repl instead of println in Clojure

Let's say we need evaluate a number of clauses in a source file, e.g.

test.clj

@(def x 1)
@(def y 2)
@(def z 3)

Only the last evaluation shows up if we plainly use either clj or lein repl,

user => (load-file "test.clj")
3 

We can surround each of them by println to show all of them,

test-with-println.clj

(println @(def x 1))
(println @(def y 2))
(println @(def z 3))

user => (load-file "test-with-println.clj")
1
2
3
nil

What are the better alternatives to avoid invasive printlns all over the source code while able to print out all the intended evaluations under the umbrella of REPLs?

@Solution

Thanks to tap> from the answer @Sean Corfield we can have desired results as follows,

• pipe every wannabe printed out to tap>.

test-with-tap.clj

(-> @(def x 1) tap>)
(-> @(def y 2) tap>)
(-> @(def z 3) tap>)

• REPLs will receive none of their outputs until tap> is turned on by add-tap.

user=> (load-file "test-with-tap.clj")
nil
user=> (add-tap @(def out (bound-fn* println)))
nil
user=> (load-file "test-with-tap.clj")
1
2
3
user=> (remove-tap out)
nil
user=> (load-file "test-with-tap.clj")
nil