From f98d6ccd70850708ca9d7fc98c561556148b397d Mon Sep 17 00:00:00 2001
From: Alan Du <alanhdu@gmail.com>
Date: Tue, 30 May 2017 23:49:26 +0100
Subject: Encode control characters with hex not decimal

Fix https://github.com/alexcrichton/toml-rs/issues/178
---
 src/ser.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/ser.rs')

diff --git a/src/ser.rs b/src/ser.rs
index 9af304f..de5d41c 100644
--- a/src/ser.rs
+++ b/src/ser.rs
@@ -290,7 +290,7 @@ impl<'a> Serializer<'a> {
                 '\u{22}' => drop(write!(self.dst, "\\\"")),
                 '\u{5c}' => drop(write!(self.dst, "\\\\")),
                 c if c < '\u{1f}' => {
-                    drop(write!(self.dst, "\\u{:04}", ch as u32))
+                    drop(write!(self.dst, "\\u{:04X}", ch as u32))
                 }
                 ch => drop(write!(self.dst, "{}", ch)),
             }
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