From 4efb34bd728732101432843ed0bfbeb971272287 Mon Sep 17 00:00:00 2001
From: Louis Pilfold <louis@lpil.uk>
Date: Thu, 21 Dec 2023 14:03:41 +0000
Subject: Add chapters

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+<p>
+  Alternative patterns can be given for a case clause using the
+  <code>|</code> operator. If any of the patterns match then the clause matches.
+</p>
+<p>
+  When matching on multiple subjects there must be the same number of patterns
+  as there are subjects. Try removing one of the <code>_,</code> sub-patterns to
+  see the compile time error that is returned.
+</p>
+<p>
+  If a pattern defines a variable then all of the alternative patterns for that
+  clause must also define a variable with the same name and same type.
+</p>
+<p>
+  Currently it is not possible to have nested alternative patterns, so the
+  pattern <code>[1 | 2 | 3]</code> is not valid.
+</p>
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