Macro Examples

• Macros are just functions that transform expressions

• Use macroexpand-1 to see definition

> (defmacro nil! (x)

(list 'setf x nil))

NIL!

> (setq x 5)

5

> (nil! x)

NIL

> x

NIL

> (macroexpand-1 '(nil! x))

(SETF X NIL)

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