diff --git a/pkgs/development/compilers/rustc/hardcode_paths.HEAD.patch b/pkgs/development/compilers/rustc/hardcode_paths.HEAD.patch
index 21e6576e4e3..8701cd3c982 100644
--- a/pkgs/development/compilers/rustc/hardcode_paths.HEAD.patch
+++ b/pkgs/development/compilers/rustc/hardcode_paths.HEAD.patch
@@ -1,5 +1,5 @@
 diff --git a/src/librustc/back/link.rs b/src/librustc/back/link.rs
-index 6332485..9500a23 100644
+index 1cc60fc..2e94b99 100644
 --- a/src/librustc/back/link.rs
 +++ b/src/librustc/back/link.rs
 @@ -383,18 +383,9 @@ pub fn mangle_internal_name_by_path_and_seq(path: PathElems, flav: &str) -> Stri
@@ -35,4 +35,3 @@ index 060dda5..fecf76b 100644
 +        None => "@arPath@"
      };
      let mut cmd = Command::new(ar);
- 
diff --git a/pkgs/development/compilers/rustc/head.nix b/pkgs/development/compilers/rustc/head.nix
index f81539fad9a..27d02a3757d 100644
--- a/pkgs/development/compilers/rustc/head.nix
+++ b/pkgs/development/compilers/rustc/head.nix
@@ -18,7 +18,7 @@ assert stdenv.gcc.gcc != null;
 
 */
 
-with ((import ./common.nix) {inherit stdenv; version = "0.12.0-pre-a2e7c4da9"; });
+with ((import ./common.nix) {inherit stdenv; version = "0.12.0-pre-3edcdbb0";});
 
 let snapshot = if stdenv.system == "i686-linux"
       then "555aca74f9a268f80cab2df1147dc6406403e9e4"
@@ -40,8 +40,8 @@ in stdenv.mkDerivation {
 
   src = fetchgit {
     url = https://github.com/rust-lang/rust;
-    rev = "a2e7c4da9b331d337fba0b3911c6d3d7f48e8305";
-    sha256 = "1lpncqx3lfyjk6llfc7pd1iqxzfhj32hjqvj09zks73r4isc02n4";
+    rev = "3edcdbb0c01187a0cc6456ca29cd858579459b18";
+    sha256 = "0s125x71r0wi7m142nnynpc6vcwlmq4bh8rbysn9cg3bvj5ddgrm";
   };
 
   # We need rust to build rust. If we don't provide it, configure will try to download it.