; Silence byte-compiler in two tests

* test/lisp/subr-tests.el (test-print-unreadable-function):
* test/src/print-tests.el (test-print-unreadable-function-buffer):
Pacify byte-compiler.

test/lisp/subr-tests.el

@@ -1044,7 +1044,8 @@ final or penultimate step during initialization."))
   ;; Check that problem with unwinding properly is fixed (bug#56773).
   (with-temp-buffer
     (let ((buf (current-buffer)))
-      (readablep (make-marker))
+      (let ((_ (readablep (make-marker)))) nil) ; this `let' silences a
+                                                ; warning
       (should (eq buf (current-buffer))))))
 
 (ert-deftest test-string-lines ()

test/src/print-tests.el

@@ -536,7 +536,8 @@ otherwise, use a different charset."
       (let ((print-unreadable-function
              (lambda (_object _escape)
                (setq callback-buffer (current-buffer)))))
-        (prin1-to-string (make-marker)))
+        (let ((_ (prin1-to-string (make-marker)))) nil))  ; this `let' silences a
+                                                          ; warning
       (should (eq current callback-buffer)))))
 
 (provide 'print-tests)