Self evaluating results of rb-tree lookups?

[TedWalther]

I want to stash some code in red-black trees.  I'd like it to automatically execute when I access it.



For instance,



(foo "bar" '(println "hi"))



When I do



(foo "bar")



I want the result to be



true



And also have the side effecting of printing "hi" to the console.



What is the best way to go about doing this?

[TedWalther]

I just had to overcome my fear of eval.   Problem solved.