From e947b4eec6bf6fb5909c4a66d6f6b04b7cd3a3b8 Mon Sep 17 00:00:00 2001
From: Kang Seonghoon <public+git@mearie.org>
Date: Thu, 20 Nov 2014 13:09:16 +0900
Subject: [PATCH] language changes: str::shift_slice_char has been updated.

---
 src/format.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/format.rs b/src/format.rs
index de4d407f..5a9ce0fd 100644
--- a/src/format.rs
+++ b/src/format.rs
@@ -43,7 +43,10 @@ fn format(w: &mut Writer, date: Option<&NaiveDate>, time: Option<&NaiveTime>,
             continue;
         }
 
-        let (head, tail) = part.slice_shift_char();
+        let (head, tail) = match part.slice_shift_char() {
+            Some((head, tail)) => (Some(head), tail),
+            None => (None, ""),
+        };
         match (head, date, time, off) {
             // year
             (Some('Y'), Some(d), _, _) => try!(write!(w, "{}", d.year())),