From 818d5c2f354cd4896659493452722c030ae7c766 Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Thu, 18 May 2017 13:20:32 +0200
Subject: Markdown: allow attributes in reference links to start on next line.

This addresses a subsidiary issue in #3674.
---
 src/Text/Pandoc/Readers/Markdown.hs |  4 +++-
 test/command/3674.md                | 13 +++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/Text/Pandoc/Readers/Markdown.hs b/src/Text/Pandoc/Readers/Markdown.hs
index 7434ef1f6..af7588562 100644
--- a/src/Text/Pandoc/Readers/Markdown.hs
+++ b/src/Text/Pandoc/Readers/Markdown.hs
@@ -392,7 +392,9 @@ referenceKey = try $ do
   src <- try betweenAngles <|> sourceURL
   tit <- option "" referenceTitle
   attr   <- option nullAttr $ try $
-              guardEnabled Ext_link_attributes >> skipSpaces >> attributes
+              do guardEnabled Ext_link_attributes
+                 skipSpaces >> optional newline >> skipSpaces
+                 attributes
   addKvs <- option [] $ guardEnabled Ext_mmd_link_attributes
                           >> many (try $ spnl >> keyValAttr)
   blanklines
diff --git a/test/command/3674.md b/test/command/3674.md
index 09f4e0d1e..92ed4bed7 100644
--- a/test/command/3674.md
+++ b/test/command/3674.md
@@ -24,3 +24,16 @@ Make sure we don't get duplicate reference links, even with
 
   [2]: b
 ```
+
+Subsidiary issue:  allow line break between reference link
+url/title and attributes:
+
+```
+% pandoc
+[a]
+
+[a]: url
+{.class}
+^D
+<p><a href="url" class="class">a</a></p>
+```
-- 
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