From 232d06cf99dd8b1236b4f816b8e5b95e004d5cf2 Mon Sep 17 00:00:00 2001
From: Tom Kwok <contact@tomkwok.com>
Date: Sat, 2 Apr 2016 22:11:14 +0800
Subject: [PATCH 1/2] Fix regression: index out of range panic in reference
 link (#172, #173)

---
 markdown.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/markdown.go b/markdown.go
index ed438de..aea997a 100644
--- a/markdown.go
+++ b/markdown.go
@@ -635,6 +635,9 @@ func scanLinkRef(p *parser, data []byte, i int) (linkOffset, linkEnd, titleOffse
 		i++
 	}
 	linkOffset = i
+	if i == len(data) {
+		return
+	}
 	for i < len(data) && data[i] != ' ' && data[i] != '\t' && data[i] != '\n' && data[i] != '\r' {
 		i++
 	}

From 69f51afe42974676426fd208d692b01f0bf58d3c Mon Sep 17 00:00:00 2001
From: Tom Kwok <contact@tomkwok.com>
Date: Sun, 3 Apr 2016 21:08:32 +0800
Subject: [PATCH 2/2] Add test for issue 172

---
 inline_test.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/inline_test.go b/inline_test.go
index 3ae2561..9fb937b 100644
--- a/inline_test.go
+++ b/inline_test.go
@@ -722,6 +722,10 @@ func TestReferenceLink(t *testing.T) {
 
 		"[link][ref]\n   [ref]: /url/",
 		"<p><a href=\"/url/\">link</a></p>\n",
+
+		// Issue 172 in blackfriday
+		"[]:<",
+		"<p>[]:&lt;</p>\n",
 	}
 	doLinkTestsInline(t, tests)
 }