From 2f639ffe09dd24d8648363b567de2d7caa39db99 Mon Sep 17 00:00:00 2001
From: "Edward Z. Yang" <ezyang@cs.stanford.edu>
Date: Thu, 9 Oct 2014 21:38:11 -0700
Subject: Fix use-after-close lazy IO bug

Make `getPrologue` force `parseParas dflags str` before returning. Without this,
it will attempt to read from the file after it is closed, with unspecified and
generally bad results.

Signed-off-by: David Feuer <David.Feuer@gmail.com>
Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
---
 src/Haddock.hs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Haddock.hs b/src/Haddock.hs
index 980926cd..c0a6714b 100644
--- a/src/Haddock.hs
+++ b/src/Haddock.hs
@@ -451,7 +451,7 @@ getPrologue dflags flags =
     [filename] -> withFile filename ReadMode $ \h -> do
       hSetEncoding h utf8
       str <- hGetContents h
-      return . Just $ parseParas dflags str
+      return . Just $! parseParas dflags str
     _ -> throwE "multiple -p/--prologue options"
 
 
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