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Jul 9, 2018 at 22:25
https://stevelosh.com/blog/2018/07/fun-with-macros-if-let/ is an excellent post on implementing if-let and when-let macros. It discusses the different ways you could expand the code, and ensuring the macro composes with other (Common) Lisp features. Really useful macro too, I'm a big fan of the elisp equivalent.
Fun with Macros: If-Let and When-Let / Steve Losh

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