From 23178ec96e9417bfb178c014f5654bd3d8f24923 Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Mon, 23 Jan 2023 10:58:44 -0800
Subject: [PATCH] LaTeX reader: Fix bug in macro resolution for environments.

This is a regression in pandoc 3.0 that affects environments
with arguments.  Closes #8573.
---
 src/Text/Pandoc/Readers/LaTeX/Macro.hs | 2 +-
 test/command/8573.md                   | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 test/command/8573.md

diff --git a/src/Text/Pandoc/Readers/LaTeX/Macro.hs b/src/Text/Pandoc/Readers/LaTeX/Macro.hs
index c640e2299..29350cd16 100644
--- a/src/Text/Pandoc/Readers/LaTeX/Macro.hs
+++ b/src/Text/Pandoc/Readers/LaTeX/Macro.hs
@@ -216,7 +216,7 @@ newenvironment = do
     let result = (name,
                     Macro GroupScope ExpandWhenUsed argspecs optarg
                       (bg:startcontents),
-                    Macro GroupScope ExpandWhenUsed argspecs optarg
+                    Macro GroupScope ExpandWhenUsed [] Nothing
                       (endcontents ++ [eg]))
     (do lookupMacro name
         case mtype of
diff --git a/test/command/8573.md b/test/command/8573.md
new file mode 100644
index 000000000..15eac9e7e
--- /dev/null
+++ b/test/command/8573.md
@@ -0,0 +1,7 @@
+```
+% pandoc -f latex -t plain
+\newenvironment{myenv}[1]{Open#1}{Close}
+\begin{myenv}{x}Hello\end{myenv}
+^D
+OpenxHelloClose
+```