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Common Problems Using Macros

Macro expansion can have counterintuitive consequences. This section describes some important consequences that can lead to trouble, and rules to follow to avoid trouble.

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• Wrong Time + Do the work in the expansion, not in the macro.
• Argument Evaluation + The expansion should evaluate each macro arg once.
• Surprising Local Vars + Local variable bindings in the expansion require special care.
• Eval During Expansion + Don’t evaluate them; put them in the expansion.
• Repeated Expansion + Avoid depending on how many times expansion is done.
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+ Copyright © 1990-1996, 1998-2022 Free Software Foundation, Inc.
Licensed under the GNU GPL license.
+ https://www.gnu.org/software/emacs/manual/html_node/elisp/Problems-with-Macros.html +

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