#define private public - A package riddle (19 Aug 2009)

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---+++ [[DefinePrivatePublic20090819PackageRiddle][A package riddle]] (19 Aug 2009)

<summary>
The other day, I spent some time debugging a surprising issue in Lisp code written
for <nop>CoCreate Modeling. Turns out that the problem can be shrunk down to
only a few lines, and is actually quite instructive on how Lisp's packages work -
an ideal candidate for this blog!
</summary>

So here is the innocent-looking code:
<pre>
(defun test()
  (test_dialog))

(in-package :clausbrod.de)
(use-package :oli)

(sd-defdialog 'test_dialog
  :ok-action '(display "test_dialog"))
</pre>

<img src="%ATTACHURLPATH%/packageriddle.png" alt="packageriddle.png"  width="411" height="36" style="float:right;" />
Copy/paste this code into a file called =test.lsp=, then load the [[%ATTACHURL%/test.lsp][file]]
into a fresh instance of <nop>CoCreate Modeling. Run the =test= function by entering =(test)= in
the user input line. Can you guess what happens now? Can you explain it?

[[DefinePrivatePublic20090820PackageRiddlePart2][To be continued...]]

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