Fix eval-when-compile and so defmacro in the REPL

diff --git a/lispstrack.lisp b/lispstrack.lisp
index bbfa924..326030b 100644 (file)
--- a/lispstrack.lisp
+++ b/lispstrack.lisp
@@ -754,7 +754,7 @@
 
 (define-compilation eval-when-compile (&rest body)
   (eval (cons 'progn body))
-  nil)
+  "")
 
 (defmacro define-transformation (name args form)
   `(define-compilation ,name ,args