Better handling of `\makeatletter` in parsing raw LaTeX.

Closes #11270.

1 files changed, 25 insertions, 0 deletions

diff --git a/test/command/11270.md b/test/command/11270.md
new file mode 100644
index 000000000..7cf681033
--- /dev/null
+++ b/test/command/11270.md
@@ -0,0 +1,25 @@
+```
+% pandoc -f markdown -t native -s
+---
+header-includes: |
+    \makeatletter
+    \beamer@ignorenonframefalse
+    \makeatother
+...
+
+^D
+Pandoc
+  Meta
+    { unMeta =
+        fromList
+          [ ( "header-includes"
+            , MetaBlocks
+                [ RawBlock
+                    (Format "tex")
+                    "\\makeatletter\n\\beamer@ignorenonframefalse\n\\makeatother"
+                ]
+            )
+          ]
+    }
+  []
+```