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File 1067-docs-add-note-about-anonymous-type-variables.patch of Package erlang (Revision a7029ee97b719a45764ae3b135bbdda2)

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From 03cfb72b67b14cf370179fe963ce07cfa0322e0e Mon Sep 17 00:00:00 2001
From: Kiko Fernandez-Reyes <kiko@erlang.org>
Date: Mon, 10 Oct 2022 08:23:49 +0200
Subject: [PATCH] docs: add note about anonymous type variables

---
 system/doc/reference_manual/typespec.xml | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/system/doc/reference_manual/typespec.xml b/system/doc/reference_manual/typespec.xml
index 03a83680a8..9ab409b7ac 100644
--- a/system/doc/reference_manual/typespec.xml
+++ b/system/doc/reference_manual/typespec.xml
@@ -607,5 +607,14 @@
       of the following form:
     </p>
     <pre>  -spec my_error(term()) -> no_return().</pre>
+
+  <note>
+    <p>Erlang uses the shorthand version <c>_</c> as an anonymous type variable
+    equivalent to <c>term()</c> or <c>any()</c>. For example, the following function
+    <pre>  -spec Function(string(), _) -> string().</pre>
+    is equivalent to:
+    <pre>  -spec Function(string(), any()) -> string().</pre>
+    </p>
+  </note>
   </section>
 </chapter>
-- 
2.35.3

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