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/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]