From eed1085b3ad11a23ca975c17856763e8294983bc Mon Sep 17 00:00:00 2001
From: Latosha Maltba <79100569+latosha-maltba@users.noreply.github.com>
Date: Thu, 30 Sep 2021 16:58:04 +0000
Subject: [PATCH] Fix bug of Sphinx's .. code:: directive not recognizing
 :class: option

Sphinx's own .. code:: directive (but not docutils') does not recognise
the :class: option but only the :classes: option.  This is probably due
to an oversight that the user-visible option is called ``:class:`` while
the Python attribute is called ``classes`` (to not collide with the
keyword ``class``).

Fix it by checking for the option ``class`` instead of ``classes``.
---
 CHANGES                      | 1 +
 sphinx/directives/patches.py | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/CHANGES b/CHANGES
index 56bb70001e6..6802ba2e79c 100644
--- a/CHANGES
+++ b/CHANGES
@@ -41,6 +41,7 @@ Bugs fixed
 * #9649: HTML search: when objects have the same name but in different domains,
   return all of them as result instead of just one.
 * #9678: linkcheck: file extension was shown twice in warnings
+* Fix bug ``.. code::`` not recognising ``:classes:`` option instead of ``:class:`` option.  The new behaviour is only to accept ``:class:``.
 
 Testing
 --------
diff --git a/sphinx/directives/patches.py b/sphinx/directives/patches.py
index 9a3034daea5..f2cb631f07e 100644
--- a/sphinx/directives/patches.py
+++ b/sphinx/directives/patches.py
@@ -154,7 +154,7 @@ def run(self) -> List[Node]:
 
         code = '\n'.join(self.content)
         node = nodes.literal_block(code, code,
-                                   classes=self.options.get('classes', []),
+                                   classes=self.options.get('class', []),
                                    force='force' in self.options,
                                    highlight_args={})
         self.add_name(node)