From a759b18abc4decd0fb03b41cee72dbe1f3ee6436 Mon Sep 17 00:00:00 2001
From: jgart
Date: Wed, 2 Feb 2022 00:36:23 -0500
Subject: lisp: tips-and-tricks: defining a scheme sexp comment with a reader
 macro

---
 topics/lisp/tips-and-tricks.scm | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 topics/lisp/tips-and-tricks.scm

diff --git a/topics/lisp/tips-and-tricks.scm b/topics/lisp/tips-and-tricks.scm
new file mode 100644
index 0000000..792980b
--- /dev/null
+++ b/topics/lisp/tips-and-tricks.scm
@@ -0,0 +1,16 @@
+# Defining a scheme sexp comment with a reader macro
+
+=> http://clhs.lisp.se/Body/f_set__1.htm SET-DISPATCH-MACRO-CHARACTER
+
+```
+CL-USER(1): (set-dispatch-macro-character #\# #\; (lambda (s c n) c n (read s t nil t) (values)))
+
+CL-USER(2): (+ 3 (+ 2 3) 1)
+
+9
+CL-USER(3): (+ 3 #;(+ 2 3) 1)
+
+4
+```
+
+Special thanks to Ed Langley on #common-lisp:matrix.org.
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