XML makes Java the "acceptable Lisp"

But really, using macros in production code is a disaster waiting to happen. With functions, you at least know what the evaluation rules are. But what if you call a macro like the following?

(with-open-file (file "test.txt" :direction :output)
(print "hello" file))

This might open a file called “test.txt” and write “hello” into it—or it might reformat your hard drive! How are you to know?