From 65f73de28a679b32bbe28c22318d8b44b06175bd Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Thu, 12 Sep 2019 08:50:12 -0700
Subject: Better message for PandocShouldNeverHappenError.

---
 src/Text/Pandoc/Error.hs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Text/Pandoc/Error.hs b/src/Text/Pandoc/Error.hs
index 2d87fed33..ae66162b3 100644
--- a/src/Text/Pandoc/Error.hs
+++ b/src/Text/Pandoc/Error.hs
@@ -66,7 +66,9 @@ handleError (Left e) =
     PandocIOError _ err' -> ioError err'
     PandocHttpError u err' -> err 61 $
       "Could not fetch " ++ u ++ "\n" ++ show err'
-    PandocShouldNeverHappenError s -> err 62 s
+    PandocShouldNeverHappenError s -> err 62 $
+      "Something we thought was impossible happened!\n" ++
+      "Please report this to pandoc's developers: " ++ s
     PandocSomeError s -> err 63 s
     PandocParseError s -> err 64 s
     PandocParsecError input err' ->
-- 
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