diff --git a/components/compositing/lib.rs b/components/compositing/lib.rs
index 3a1f3459eb1..4e71e9fb2a7 100644
--- a/components/compositing/lib.rs
+++ b/components/compositing/lib.rs
@@ -5,7 +5,8 @@
 #![feature(box_syntax)]
 #![feature(core)]
 #![feature(int_uint)]
-#![feature(io)]
+#![feature(old_io)]
+#![feature(old_path)]
 #![feature(rustc_private)]
 #![feature(std_misc)]
 
diff --git a/components/compositing/scrolling.rs b/components/compositing/scrolling.rs
index 71e58bcd94a..89890fd2b27 100644
--- a/components/compositing/scrolling.rs
+++ b/components/compositing/scrolling.rs
@@ -40,7 +40,7 @@ impl ScrollingTimerProxy {
                 receiver: to_scrolling_timer_receiver,
             };
             scrolling_timer.run();
-        });
+        }).unwrap();
         ScrollingTimerProxy {
             sender: to_scrolling_timer_sender,
         }
diff --git a/components/devtools/lib.rs b/components/devtools/lib.rs
index 78f4cd951fe..828f3b3bbab 100644
--- a/components/devtools/lib.rs
+++ b/components/devtools/lib.rs
@@ -10,7 +10,7 @@
 #![crate_name = "devtools"]
 #![crate_type = "rlib"]
 
-#![feature(int_uint, box_syntax, io, core, rustc_private)]
+#![feature(int_uint, box_syntax, io, old_io, core, rustc_private)]
 #![feature(collections, std_misc)]
 
 #![allow(non_snake_case)]
diff --git a/components/gfx/display_list/mod.rs b/components/gfx/display_list/mod.rs
index c8da46bee58..74c0792fdcd 100644
--- a/components/gfx/display_list/mod.rs
+++ b/components/gfx/display_list/mod.rs
@@ -14,7 +14,7 @@
 //! They are therefore not exactly analogous to constructs like Skia pictures, which consist of
 //! low-level drawing primitives.
 
-#![deny(unsafe_blocks)]
+#![deny(unsafe_code)]
 
 use display_list::optimizer::DisplayListOptimizer;
 use paint_context::{PaintContext, ToAzureRect};
diff --git a/components/gfx/lib.rs b/components/gfx/lib.rs
index 3fe671fc888..2bd53bd699b 100644
--- a/components/gfx/lib.rs
+++ b/components/gfx/lib.rs
@@ -6,10 +6,9 @@
 #![feature(box_syntax)]
 #![feature(collections)]
 #![feature(core)]
-#![feature(hash)]
 #![feature(int_uint)]
-#![cfg_attr(any(target_os="linux", target_os = "android"), feature(io))]
-#![cfg_attr(any(target_os="linux", target_os = "android"), feature(path))]
+#![cfg_attr(any(target_os="linux", target_os = "android"), feature(old_io))]
+#![cfg_attr(any(target_os="linux", target_os = "android"), feature(old_path))]
 #![feature(plugin)]
 #![feature(rustc_private)]
 #![feature(std_misc)]
diff --git a/components/gfx/paint_task.rs b/components/gfx/paint_task.rs
index b21e861a8f8..db281e1acac 100644
--- a/components/gfx/paint_task.rs
+++ b/components/gfx/paint_task.rs
@@ -439,7 +439,7 @@ impl WorkerThreadProxy {
                                                           font_cache_task,
                                                           time_profiler_chan);
                 worker_thread.main();
-            });
+            }).unwrap();
             WorkerThreadProxy {
                 receiver: from_worker_receiver,
                 sender: to_worker_sender,
diff --git a/components/gfx/platform/freetype/font_list.rs b/components/gfx/platform/freetype/font_list.rs
index 1b835339e31..5b1d309b31e 100644
--- a/components/gfx/platform/freetype/font_list.rs
+++ b/components/gfx/platform/freetype/font_list.rs
@@ -59,7 +59,7 @@ pub fn get_variations_for_family<F>(family_name: &str, mut callback: F)
         let font_set_array_ptr = &mut font_set;
         let pattern = FcPatternCreate();
         assert!(!pattern.is_null());
-        let family_name_c = CString::from_slice(family_name.as_bytes());
+        let family_name_c = CString::new(family_name).unwrap();
         let family_name = family_name_c.as_ptr();
         let ok = FcPatternAddString(pattern, FC_FAMILY.as_ptr() as *mut c_char, family_name as *mut FcChar8);
         assert!(ok != 0);
@@ -102,7 +102,7 @@ pub fn get_variations_for_family<F>(family_name: &str, mut callback: F)
 }
 
 pub fn get_system_default_family(generic_name: &str) -> Option<String> {
-    let generic_name_c = CString::from_slice(generic_name.as_bytes());
+    let generic_name_c = CString::new(generic_name).unwrap();
     let generic_name_ptr = generic_name_c.as_ptr();
 
     unsafe {
diff --git a/components/msg/lib.rs b/components/msg/lib.rs
index b7aec05fe87..b4517b2fff9 100644
--- a/components/msg/lib.rs
+++ b/components/msg/lib.rs
@@ -2,7 +2,6 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#![feature(hash)]
 #![feature(int_uint)]
 
 extern crate azure;
diff --git a/components/net/lib.rs b/components/net/lib.rs
index e29a4cfdaed..2387583b76e 100644
--- a/components/net/lib.rs
+++ b/components/net/lib.rs
@@ -5,10 +5,12 @@
 #![feature(box_syntax)]
 #![feature(collections)]
 #![feature(core)]
-#![feature(env)]
 #![feature(int_uint)]
 #![feature(io)]
+#![feature(old_io)]
+#![feature(old_path)]
 #![feature(path)]
+#![feature(path_ext)]
 #![feature(plugin)]
 #![feature(rustc_private)]
 #![feature(std_misc)]
diff --git a/components/net/sniffer_task.rs b/components/net/sniffer_task.rs
index 2b9b2363a0a..f3ec4c988ea 100644
--- a/components/net/sniffer_task.rs
+++ b/components/net/sniffer_task.rs
@@ -14,7 +14,7 @@ pub fn new_sniffer_task() -> SnifferTask {
     let builder = Builder::new().name("SnifferManager".to_string());
     builder.spawn(move || {
         SnifferManager::new(rec).start();
-    });
+    }).unwrap();
     sen
 }
 
diff --git a/components/script/build.rs b/components/script/build.rs
index ca5ecaf9369..88b1e22b953 100644
--- a/components/script/build.rs
+++ b/components/script/build.rs
@@ -2,17 +2,12 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#![feature(io)]
-
-use std::old_io::process::{Command, ProcessExit, StdioContainer};
-
+use std::process::Command;
 
 fn main() {
-    let result = Command::new("make")
+    assert!(Command::new("make")
         .args(&["-f", "makefile.cargo"])
-        .stdout(StdioContainer::InheritFd(1))
-        .stderr(StdioContainer::InheritFd(2))
         .status()
-        .unwrap();
-    assert_eq!(result, ProcessExit::ExitStatus(0));
+        .unwrap()
+        .success());
 }
diff --git a/components/script_traits/lib.rs b/components/script_traits/lib.rs
index d6e81a90ac0..58fa83dbf67 100644
--- a/components/script_traits/lib.rs
+++ b/components/script_traits/lib.rs
@@ -2,7 +2,6 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#![feature(core)]
 #![feature(int_uint)]
 
 extern crate devtools_traits;
diff --git a/components/style/build.rs b/components/style/build.rs
index ff177c4f702..8e2117614cf 100644
--- a/components/style/build.rs
+++ b/components/style/build.rs
@@ -2,32 +2,33 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#![feature(env, old_io, old_path)]
+#![feature(io, path)]
 
 use std::env;
-use std::old_path::Path;
-use std::old_io::process::{Command, ProcessExit, StdioContainer};
-use std::old_io::File;
+use std::fs::File;
+use std::io::Write;
+use std::process::{Command, Stdio};
+use std::path::Path;
 
 
 fn main() {
-    let python = if Command::new("python2.7").arg("--version").status() == Ok(ProcessExit::ExitStatus(0)) {
+    let python = if Command::new("python2.7").arg("--version").status().unwrap().success() {
         "python2.7"
     } else {
         "python"
     };
-    let style = Path::new(file!()).dir_path();
+    let style = Path::new(file!()).parent().unwrap();
     let mako = style.join("Mako-0.9.1.zip");
     let template = style.join("properties.mako.rs");
     let result = Command::new(python)
-        .env("PYTHONPATH", mako.as_str().unwrap())
-        .env("TEMPLATE", template.as_str().unwrap())
+        .env("PYTHONPATH", &mako)
+        .env("TEMPLATE", &template)
         .arg("-c")
         .arg("from os import environ; from mako.template import Template; print(Template(filename=environ['TEMPLATE']).render())")
-        .stderr(StdioContainer::InheritFd(2))
+        .stderr(Stdio::inherit())
         .output()
         .unwrap();
-    assert_eq!(result.status, ProcessExit::ExitStatus(0));
-    let out = Path::new(env::var("OUT_DIR").unwrap());
-    File::create(&out.join("properties.rs")).unwrap().write_all(&*result.output).unwrap();
+    assert!(result.status.success());
+    let out = env::var("OUT_DIR").unwrap();
+    File::create(&Path::new(&out).join("properties.rs")).unwrap().write_all(&result.stdout).unwrap();
 }
diff --git a/components/style/lib.rs b/components/style/lib.rs
index 32e4a3bf3ef..76a0cbb6866 100644
--- a/components/style/lib.rs
+++ b/components/style/lib.rs
@@ -2,11 +2,11 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+#![feature(alloc)]
 #![feature(plugin)]
 #![feature(int_uint)]
 #![feature(box_syntax)]
 #![feature(core)]
-#![feature(std_misc)]
 #![feature(collections)]
 #![feature(rustc_private)]
 
diff --git a/components/style/selector_matching.rs b/components/style/selector_matching.rs
index bc74eb1c122..7ada9b7fdb8 100644
--- a/components/style/selector_matching.rs
+++ b/components/style/selector_matching.rs
@@ -9,7 +9,7 @@ use selectors::matching::{SelectorMap, Rule};
 use selectors::matching::DeclarationBlock as GenericDeclarationBlock;
 use selectors::parser::PseudoElement;
 use selectors::smallvec::VecLike;
-use selectors::tree::{TNode, TElement};
+use selectors::tree::TNode;
 use util::resource_files::read_resource_file;
 
 use legacy::PresentationalHintSynthesis;
diff --git a/components/util/lib.rs b/components/util/lib.rs
index 6cebd0155a5..094bd292897 100644
--- a/components/util/lib.rs
+++ b/components/util/lib.rs
@@ -6,15 +6,20 @@
 #![feature(box_syntax)]
 #![feature(collections)]
 #![feature(core)]
-#![feature(env)]
+#![feature(exit_status)]
 #![feature(hash)]
 #![feature(int_uint)]
 #![feature(io)]
 #![feature(optin_builtin_traits)]
+#![feature(old_io)]
+#![feature(old_path)]
+#![feature(page_size)]
 #![feature(path)]
+#![feature(path_ext)]
 #![feature(plugin)]
 #![feature(rustc_private)]
 #![feature(std_misc)]
+#![feature(str_words)]
 #![feature(unicode)]
 #![feature(unsafe_destructor)]
 
diff --git a/components/util/memory.rs b/components/util/memory.rs
index 6c9f38c6141..4bc44b332c3 100644
--- a/components/util/memory.rs
+++ b/components/util/memory.rs
@@ -451,12 +451,12 @@ fn get_jemalloc_stat(value_name: &str) -> Option<u64> {
     // request. Without that jemalloc gives cached statistics(!) which can be
     // highly inaccurate.
     let epoch_name = "epoch";
-    let epoch_c_name = CString::from_slice(epoch_name.as_bytes());
+    let epoch_c_name = CString::new(epoch_name).unwrap();
     let mut epoch: u64 = 0;
     let epoch_ptr = &mut epoch as *mut _ as *mut c_void;
     let mut epoch_len = size_of::<u64>() as size_t;
 
-    let value_c_name = CString::from_slice(value_name.as_bytes());
+    let value_c_name = CString::new(value_name).unwrap();
     let mut value: size_t = 0;
     let value_ptr = &mut value as *mut _ as *mut c_void;
     let mut value_len = size_of::<size_t>() as size_t;
diff --git a/components/util/range.rs b/components/util/range.rs
index df32d0cffd3..86d670d2f84 100644
--- a/components/util/range.rs
+++ b/components/util/range.rs
@@ -126,7 +126,7 @@ macro_rules! int_range_index {
 
         impl ::std::num::NumCast for $Self_ {
             fn from<T: ToPrimitive>(n: T) -> Option<$Self_> {
-                n.to_int().map($Self_)
+                n.to_isize().map($Self_)
             }
         }
 
diff --git a/components/util/str.rs b/components/util/str.rs
index bc193002ff1..f4e3badab15 100644
--- a/components/util/str.rs
+++ b/components/util/str.rs
@@ -9,10 +9,10 @@ use cssparser::{self, RGBA, Color};
 use libc::c_char;
 use std::ascii::AsciiExt;
 use std::borrow::ToOwned;
-use std::ffi::c_str_to_bytes;
+use std::ffi::CStr;
 use std::iter::Filter;
 use std::num::{Int, ToPrimitive};
-use std::str::{from_utf8, CharEq, FromStr, Split};
+use std::str::{from_utf8, FromStr, Split};
 
 pub type DOMString = String;
 pub type StaticCharVec = &'static [char];
@@ -333,5 +333,5 @@ impl Str for LowercaseString {
 /// Creates a String from the given null-terminated buffer.
 /// Panics if the buffer does not contain UTF-8.
 pub unsafe fn c_str_to_string(s: *const c_char) -> String {
-    from_utf8(c_str_to_bytes(&s)).unwrap().to_owned()
+    from_utf8(CStr::from_ptr(s).to_bytes()).unwrap().to_owned()
 }
diff --git a/components/util/task.rs b/components/util/task.rs
index 88acbd65e09..97770269259 100644
--- a/components/util/task.rs
+++ b/components/util/task.rs
@@ -14,7 +14,7 @@ pub fn spawn_named<F>(name: String, f: F)
     let builder = thread::Builder::new().name(name);
     builder.spawn(move || {
         f()
-    });
+    }).unwrap();
 }
 
 /// Arrange to send a particular message to a channel if the task fails.
@@ -40,7 +40,7 @@ pub fn spawn_named_with_send_on_failure<F, T>(name: &'static str,
                 dest.send(msg).unwrap();
             }
         }
-    });
+    }).unwrap();
 }
 
 #[test]
diff --git a/ports/glutin/lib.rs b/ports/glutin/lib.rs
index 8e56150d6af..c64ff2a4e91 100644
--- a/ports/glutin/lib.rs
+++ b/ports/glutin/lib.rs
@@ -6,7 +6,6 @@
 
 #![feature(int_uint)]
 #![feature(core)]
-#![cfg_attr(feature = "window", feature(hash))]
 #![feature(box_syntax)]
 
 #[macro_use] extern crate bitflags;
diff --git a/support/rust-task_info/build.rs b/support/rust-task_info/build.rs
index f2dc14999c4..99552a2ed48 100644
--- a/support/rust-task_info/build.rs
+++ b/support/rust-task_info/build.rs
@@ -2,21 +2,14 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#![feature(env)]
-#![feature(io)]
-#![feature(old_io)]
-
-use std::old_io::process::{Command, ProcessExit, StdioContainer};
+use std::process::Command;
 use std::env;
 
 fn main() {
-    let out_dir = env::var("OUT_DIR").unwrap();
-    let result = Command::new("make")
+    assert!(Command::new("make")
         .args(&["-f", "makefile.cargo"])
-        .stdout(StdioContainer::InheritFd(1))
-        .stderr(StdioContainer::InheritFd(2))
         .status()
-        .unwrap();
-    assert_eq!(result, ProcessExit::ExitStatus(0));
-    println!("cargo:rustc-flags=-L native={}", out_dir);
+        .unwrap()
+        .success());
+    println!("cargo:rustc-flags=-L native={}", env::var("OUT_DIR").unwrap());
 }