From 311b3cc529097ef83a8212439dafcabb86534c62 Mon Sep 17 00:00:00 2001
From: Łukasz Hanuszczak <lukasz.hanuszczak@gmail.com>
Date: Sun, 28 Jun 2015 22:28:00 +0200
Subject: Prevent source parser from throwing exception when lexing fails.

---
 haddock-api/src/Haddock/Backends/Hyperlinker/Parser.hs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/haddock-api/src/Haddock/Backends/Hyperlinker/Parser.hs b/haddock-api/src/Haddock/Backends/Hyperlinker/Parser.hs
index 6e195dba..bab5ba0a 100644
--- a/haddock-api/src/Haddock/Backends/Hyperlinker/Parser.hs
+++ b/haddock-api/src/Haddock/Backends/Hyperlinker/Parser.hs
@@ -63,7 +63,9 @@ chunk str@(c:_)
 chunk str
     | "--" `isPrefixOf` str = chunk' $ spanToNewline str
     | "{-" `isPrefixOf` str = chunk' $ chunkComment 0 str
-    | otherwise = chunk' $ head $ lex str
+    | otherwise = case lex str of
+        (tok:_) -> chunk' tok
+        [] -> [str]
   where
     chunk' (c, rest) = c:(chunk rest)
 
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