From 38e0745e3f5e6c772c973c1d0b73abb0b20faba0 Mon Sep 17 00:00:00 2001
From: Aaron Turon <aturon@mozilla.com>
Date: Fri, 31 Oct 2014 12:54:10 -0700
Subject: [PATCH] Add type annotation to deal with fallout

---
 src/librustc/driver/driver.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/librustc/driver/driver.rs b/src/librustc/driver/driver.rs
index f6aab6ef477..d3ed0dbd99e 100644
--- a/src/librustc/driver/driver.rs
+++ b/src/librustc/driver/driver.rs
@@ -660,7 +660,7 @@ fn write_out_deps(sess: &Session,
         _ => return,
     };
 
-    let result = (|| {
+    let result = (|| -> io::IoResult<()> {
         // Build a list of files used to compile the output and
         // write Makefile-compatible dependency rules
         let files: Vec<String> = sess.codemap().files.borrow()