Explanation of macros; Haskell macros

[Paul Dietz]

> Does anybody have a keyword-style list of useful applications of the
> macro facilities?

Here's an example of a utility that is easy to implement with lisp
macros, but rather more difficult to do without them:

http://www-2.cs.cmu.edu/afs/cs/project/ai-repository/ai/lang/lisp/code/testing/cover/0.html
(described in http://www.merl.com/papers/TR91-04/ )

	Paul