From 7ba0ae8b4d9a6d3e7d4484a5f257e1e53f35667d Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Sun, 12 Nov 2017 14:19:58 -0800
Subject: LaTeX reader: allow optional args for parbox.

See #4056.
---
 src/Text/Pandoc/Readers/LaTeX.hs |  2 +-
 test/command/4056.md             | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 test/command/4056.md

diff --git a/src/Text/Pandoc/Readers/LaTeX.hs b/src/Text/Pandoc/Readers/LaTeX.hs
index 9bac3d3a7..708980f1d 100644
--- a/src/Text/Pandoc/Readers/LaTeX.hs
+++ b/src/Text/Pandoc/Readers/LaTeX.hs
@@ -2003,7 +2003,7 @@ closing = do
 blockCommands :: PandocMonad m => M.Map Text (LP m Blocks)
 blockCommands = M.fromList $
    [ ("par", mempty <$ skipopts)
-   , ("parbox",  braced >> grouped blocks)
+   , ("parbox",  skipopts >> braced >> grouped blocks)
    , ("title", mempty <$ (skipopts *>
                              (grouped inline >>= addMeta "title")
                          <|> (grouped block >>= addMeta "title")))
diff --git a/test/command/4056.md b/test/command/4056.md
new file mode 100644
index 000000000..be245a30d
--- /dev/null
+++ b/test/command/4056.md
@@ -0,0 +1,11 @@
+```
+% pandoc -f markdown -t native
+\parbox[t]{0.4\textwidth}{
+\begin{shaded}
+\end{shaded}
+}
+^D
+[RawBlock (Format "latex") "\\parbox[t]{0.4\\textwidth}{\n\\begin{shaded}\n\\end{shaded}\n}"]
+```
+
+
-- 
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