From d44adb148e51976d8d45a9a7971d7414ba96e37d Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Sat, 22 Jul 2017 13:33:48 -0700
Subject: [PATCH] Correctly report the cause of IO error

This was fixed in #195 but unintentionally reverted in #194.
---
 src/internal.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/internal.rs b/src/internal.rs
index 3baa5a6..e6b55a8 100644
--- a/src/internal.rs
+++ b/src/internal.rs
@@ -68,7 +68,7 @@ impl error::Error for ErrorKind {
 
     fn cause(&self) -> Option<&error::Error> {
         match *self {
-            ErrorKind::Io(ref err) => err.cause(),
+            ErrorKind::Io(ref err) => Some(err),
             ErrorKind::InvalidEncoding{..} => None,
             ErrorKind::SequenceMustHaveLength => None,
             ErrorKind::SizeLimit => None,