Remember that Common Lisp, at least, has many different types of macros. The most common are ordinary s-expression macros (macros that look like s-expressions a

Remember that Common Lisp, at least, has many different types of macros. The most common are ordinary s-expression macros (macros that look like s-expressions and output an s-expression at compile time). However, there are also symbol macros and reader macros as well, each of which are used to make Common Lisp massively extensible and an amazingly expressive language.