From 62855e2c089d73a2f08c96fd3b369ce2dcb08cb5 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Tue, 1 Oct 2013 10:01:14 -0700
Subject: [PATCH] Fix usage of the old debug! macros

---
 src/libsyntax/ext/expand.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index 5118184bf00..39540deb38f 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -821,7 +821,7 @@ macro_rules! log(
                 if lvl <= __log_level() {
                     format_args!(|args| {
                         ::std::logging::log(lvl, args)
-                    }, \"{}\", fmt!(\"{:?}\", $arg))
+                    }, \"{}\", fmt!(\"%?\", $arg))
                 }
             });
             ($lvl:expr, $($arg:expr),+) => ({