diff --git a/src/chroot/chroot.rs b/src/chroot/chroot.rs
index c718460c6..a4d74c04c 100644
--- a/src/chroot/chroot.rs
+++ b/src/chroot/chroot.rs
@@ -14,7 +14,9 @@ extern crate libc;
 use getopts::{optflag, optopt, getopts, usage};
 use c_types::{get_pw_from_args, get_group};
 use libc::funcs::posix88::unistd::{execvp, setuid, setgid};
+use std::ffi::c_str_to_bytes;
 use std::io::fs::PathExtensions;
+use std::iter::FromIterator;
 
 #[path = "../common/util.rs"] #[macro_use] mod util;
 #[path = "../common/c_types.rs"] mod c_types;
@@ -191,8 +193,9 @@ fn set_user(user: &str) {
 
 fn strerror(errno: i32) -> String {
     unsafe {
-        let err = libc::funcs::c95::string::strerror(errno);
-        String::from_raw_buf(err as *const u8)
+        let err = libc::funcs::c95::string::strerror(errno) as *const libc::c_char;
+        let bytes= c_str_to_bytes(&err);
+        String::from_utf8_lossy(bytes).to_string()
     }
 }
 
diff --git a/src/comm/comm.rs b/src/comm/comm.rs
index 670c56c1e..8f16cdc0f 100644
--- a/src/comm/comm.rs
+++ b/src/comm/comm.rs
@@ -11,7 +11,7 @@
 
 extern crate getopts;
 
-use std::cmp::Ord;
+use std::cmp::Ordering;
 use std::io::{BufferedReader, IoResult, print};
 use std::io::fs::File;
 use std::io::stdio::{stdin, StdinReader};
@@ -60,33 +60,33 @@ impl LineReader {
 
 fn comm(a: &mut LineReader, b: &mut LineReader, opts: &getopts::Matches) {
 
-    let delim = Vec::from_fn(4, |col| mkdelim(col, opts));
+    let delim : Vec<String> = range(0, 4).map(|col| mkdelim(col, opts)).collect();
 
     let mut ra = a.read_line();
     let mut rb = b.read_line();
 
     while ra.is_ok() || rb.is_ok() {
         let ord = match (ra.clone(), rb.clone()) {
-            (Err(_), Ok(_))  => Greater,
-            (Ok(_) , Err(_)) => Less,
+            (Err(_), Ok(_))  => Ordering::Greater,
+            (Ok(_) , Err(_)) => Ordering::Less,
             (Ok(s0), Ok(s1)) => s0.cmp(&s1),
             _ => unreachable!(),
         };
 
         match ord {
-            Less => {
+            Ordering::Less => {
                 if !opts.opt_present("1") {
                     print!("{}{}", delim[1], ra.map(ensure_nl).unwrap());
                 }
                 ra = a.read_line();
             }
-            Greater => {
+            Ordering::Greater => {
                 if !opts.opt_present("2") {
                     print!("{}{}", delim[2], rb.map(ensure_nl).unwrap());
                 }
                 rb = b.read_line();
             }
-            Equal => {
+            Ordering::Equal => {
                 if !opts.opt_present("3") {
                     print!("{}{}", delim[3], ra.map(ensure_nl).unwrap());
                 }
diff --git a/src/common/c_types.rs b/src/common/c_types.rs
index e96cbd83f..0650a51d7 100644
--- a/src/common/c_types.rs
+++ b/src/common/c_types.rs
@@ -15,6 +15,8 @@ use self::libc::int32_t;
 
 use self::libc::funcs::posix88::unistd::getgroups;
 
+use std::ffi::{c_str_to_bytes, CString};
+use std::iter::repeat;
 use std::vec::Vec;
 
 use std::os;
@@ -122,7 +124,7 @@ pub fn get_pw_from_args(free: &Vec<String>) -> Option<c_passwd> {
             let id = username.parse::<u32>().unwrap();
             let pw_pointer = unsafe { getpwuid(id as uid_t) };
 
-            if pw_pointer.is_not_null() {
+            if !pw_pointer.is_null() {
                 Some(unsafe { read(pw_pointer) })
             } else {
                 crash!(1, "{}: no such user", username);
@@ -131,9 +133,10 @@ pub fn get_pw_from_args(free: &Vec<String>) -> Option<c_passwd> {
         // Passed the username as a string
         } else {
             let pw_pointer = unsafe {
-                getpwnam(username.as_slice().to_c_str().into_inner() as *const libc::c_char)
+                let cstr = CString::from_slice(username.as_bytes());
+                getpwnam(cstr.as_slice_with_nul().as_ptr())
             };
-            if pw_pointer.is_not_null() {
+            if !pw_pointer.is_null() {
                 Some(unsafe { read(pw_pointer) })
             } else {
                 crash!(1, "{}: no such user", username);
@@ -148,10 +151,13 @@ pub fn get_group(groupname: &str) -> Option<c_group> {
     let group = if groupname.chars().all(|c| c.is_digit(10)) {
         unsafe { getgrgid(groupname.parse().unwrap()) }
     } else {
-        unsafe { getgrnam(groupname.to_c_str().into_inner() as *const c_char) }
+        unsafe { 
+            let cstr = CString::from_slice(groupname.as_bytes());
+            getgrnam(cstr.as_slice_with_nul().as_ptr() as *const c_char)
+        }
     };
 
-    if group.is_not_null() {
+    if !group.is_null() {
         Some(unsafe { read(group) })
     }
     else {
@@ -199,7 +205,7 @@ pub fn get_groups() -> Result<Vec<gid_t>, uint> {
         return Err(os::errno());
     }
 
-    let mut groups = Vec::from_elem(ngroups as uint, 0 as gid_t);
+    let mut groups : Vec<gid_t>= repeat(0).take(ngroups as uint).collect();
     let ngroups = unsafe { getgroups(ngroups, groups.as_mut_ptr()) };
     if ngroups == -1 {
         Err(os::errno())
@@ -222,9 +228,11 @@ pub fn group(possible_pw: Option<c_passwd>, nflag: bool) {
             for &g in groups.iter() {
                 if nflag {
                     let group = unsafe { getgrgid(g) };
-                    if group.is_not_null() {
+                    if !group.is_null() {
                         let name = unsafe {
-                            String::from_raw_buf(read(group).gr_name as *const u8)
+                            let gname = read(group).gr_name;
+                            let bytes= c_str_to_bytes(&gname);
+                            String::from_utf8_lossy(bytes).to_string()
                         };
                         print!("{} ", name);
                     }
diff --git a/src/hashsum/hashsum.rs b/src/hashsum/hashsum.rs
index 199ef94b3..f5ed9a056 100644
--- a/src/hashsum/hashsum.rs
+++ b/src/hashsum/hashsum.rs
@@ -71,7 +71,7 @@ fn detect_algo(program: &str, matches: &getopts::Matches) -> (&'static str, Box<
         "sha512sum" => ("SHA512", box Sha512::new() as Box<Digest>),
         _ => {
             {
-                let set_or_crash = |n, val| -> () {
+                let mut set_or_crash = |&mut: n, val| -> () {
                     if alg.is_some() { crash!(1, "You cannot combine multiple hash algorithms!") };
                     name = n;
                     alg = Some(val);
diff --git a/src/hostname/hostname.rs b/src/hostname/hostname.rs
index d0f7d8994..5ad247404 100644
--- a/src/hostname/hostname.rs
+++ b/src/hostname/hostname.rs
@@ -17,6 +17,7 @@ extern crate libc;
 
 use std::collections::hash_set::HashSet;
 use std::io::net::addrinfo;
+use std::iter::repeat;
 use std::str;
 use getopts::{optflag, getopts, usage};
 
@@ -130,8 +131,7 @@ fn help_menu(program: &str, options: &[getopts::OptGroup]) {
 
 fn xgethostname() -> String {
     let namelen = 256u;
-    let mut name = Vec::from_elem(namelen, 0u8);
-
+    let mut name : Vec<u8> = repeat(0).take(namelen).collect();
     let err = unsafe {
         gethostname (name.as_mut_ptr() as *mut libc::c_char,
                                         namelen as libc::size_t)
diff --git a/src/logname/logname.rs b/src/logname/logname.rs
index 0571640e1..f5a36ca6c 100644
--- a/src/logname/logname.rs
+++ b/src/logname/logname.rs
@@ -16,6 +16,7 @@
 extern crate getopts;
 extern crate libc;
 
+use std::ffi::c_str_to_bytes;
 use std::io::print;
 use libc::c_char;
 
@@ -32,7 +33,7 @@ fn get_userlogin() -> Option<String> {
             if login.is_null() {
                     None
             } else {
-                    Some(String::from_raw_buf(login as *const u8))
+                    Some(String::from_utf8_lossy(c_str_to_bytes(&login)).to_string())
             }
     }
 }
diff --git a/src/paste/paste.rs b/src/paste/paste.rs
index 72af5d141..a4ecbe8e6 100644
--- a/src/paste/paste.rs
+++ b/src/paste/paste.rs
@@ -13,6 +13,7 @@ extern crate getopts;
 extern crate libc;
 
 use std::io;
+use std::iter::repeat; 
 
 #[path = "../common/util.rs"]
 #[macro_use]
@@ -88,7 +89,7 @@ fn paste(filenames: Vec<String>, serial: bool, delimiters: &str) {
             println!("{}", output.as_slice().slice_to(output.len() - 1));
         }
     } else {
-        let mut eof = Vec::from_elem(files.len(), false);
+        let mut eof : Vec<bool> = repeat(false).take(files.len()).collect();
         loop {
             let mut output = "".to_string();
             let mut eof_count = 0;
diff --git a/src/shuf/shuf.rs b/src/shuf/shuf.rs
index 5ca8fbf6d..946967d27 100644
--- a/src/shuf/shuf.rs
+++ b/src/shuf/shuf.rs
@@ -151,7 +151,7 @@ fn shuf(input: Vec<String>, mode: Mode, repeat: bool, zero: bool, count: uint, o
 
 enum WrappedRng {
     RngFile(rand::reader::ReaderRng<io::File>),
-    RngDefault(rand::TaskRng),
+    RngDefault(rand::ThreadRng),
 }
 
 impl WrappedRng {
@@ -170,7 +170,7 @@ fn shuf_lines(mut lines: Vec<String>, repeat: bool, zero: bool, count: uint, out
     };
     let mut rng = match random {
         Some(name) => WrappedRng::RngFile(rand::reader::ReaderRng::new(try!(io::File::open(&Path::new(name))))),
-        None => WrappedRng::RngDefault(rand::task_rng()),
+        None => WrappedRng::RngDefault(rand::thread_rng()),
     };
     let mut len = lines.len();
     let max = if repeat { count } else { cmp::min(count, len) };
diff --git a/src/split/split.rs b/src/split/split.rs
index 6dd2e33f7..f5a26f4dd 100644
--- a/src/split/split.rs
+++ b/src/split/split.rs
@@ -177,7 +177,7 @@ impl Splitter for ByteSplitter {
             _ => crash!(1, "invalid number of bytes")
         };
         let n = if suffix.is_alphabetic() {
-            match String::from_chars(strategy_param.as_slice()).as_slice().parse::<uint>() {
+            match strategy_param.as_slice().iter().map(|c| *c).collect::<String>().as_slice().parse::<uint>() {
                 Some(a) => a,
                 _ => crash!(1, "invalid number of bytes")
             }
diff --git a/src/sum/sum.rs b/src/sum/sum.rs
index 4d46f421d..c92bc8a18 100644
--- a/src/sum/sum.rs
+++ b/src/sum/sum.rs
@@ -108,7 +108,7 @@ pub fn uumain(args: Vec<String>) -> int {
     let sysv = matches.opt_present("sysv");
 
     let files = if matches.free.is_empty() {
-        Vec::from_elem(1, "-".to_string())
+        vec!["-".to_string()]
     } else {
         matches.free
     };
diff --git a/src/sync/sync.rs b/src/sync/sync.rs
index 2b9903544..8f007dfce 100644
--- a/src/sync/sync.rs
+++ b/src/sync/sync.rs
@@ -102,7 +102,7 @@ mod platform {
     unsafe fn find_all_volumes() -> Vec<String> {
         match find_first_volume() {
             (first_volume, next_volume_handle) => {
-                let mut volumes = Vec::from_elem(1, first_volume);
+                let mut volumes = vec![first_volume];
                 loop {
                     let mut name: [libc::c_char; 260] = mem::uninitialized(); // MAX_PATH
                     match FindNextVolumeA(next_volume_handle,
diff --git a/src/tee/tee.rs b/src/tee/tee.rs
index cd26e58e1..e2f290caa 100644
--- a/src/tee/tee.rs
+++ b/src/tee/tee.rs
@@ -1,7 +1,5 @@
 #![crate_name = "tee"]
 #![feature(phase)]
-#![feature(macro_rules)]
-
 /*
  * This file is part of the uutils coreutils package.
  *
@@ -12,7 +10,7 @@
  */
 
 extern crate getopts;
-#[phase(plugin, link)] extern crate log;
+#[macro_use] extern crate log;
 
 use std::io::{println, stdin, stdout, Append, File, Truncate, Write};
 use std::io::{IoResult};
@@ -143,7 +141,7 @@ impl Reader for NamedReader {
     }
 }
 
-fn with_path<T>(path: &Path, cb: || -> IoResult<T>) -> IoResult<T> {
+fn with_path<F, T>(path: &Path, cb: F) -> IoResult<T> where F: Fn() -> IoResult<T> {
     match cb() {
         Err(f) => { warn(format!("{}: {}", path.display(), f.to_string()).as_slice()); Err(f) }
         okay => okay
diff --git a/src/tty/tty.rs b/src/tty/tty.rs
index 3c08489c5..d7d0aaf2d 100644
--- a/src/tty/tty.rs
+++ b/src/tty/tty.rs
@@ -17,6 +17,7 @@
 extern crate getopts;
 extern crate libc;
 
+use std::ffi::c_str_to_bytes;
 use std::io::println;
 use std::io::stdio::stderr;
 use getopts::{optflag,getopts};
@@ -48,7 +49,14 @@ pub fn uumain(args: Vec<String>) -> int {
         }
     };
 
-    let tty = unsafe { String::from_raw_buf(ttyname(libc::STDIN_FILENO) as *const u8) };
+    let tty = unsafe { 
+        let ptr = ttyname(libc::STDIN_FILENO);
+        if !ptr.is_null() {
+            String::from_utf8_lossy(c_str_to_bytes(&ptr)).to_string()
+        } else {
+            "".to_string()
+        }
+    };
 
     if !silent {
         if !tty.as_slice().chars().all(|c| c.is_whitespace()) {
diff --git a/src/uname/uname.rs b/src/uname/uname.rs
index c7e8a1ff1..c944891b4 100644
--- a/src/uname/uname.rs
+++ b/src/uname/uname.rs
@@ -16,6 +16,7 @@
 extern crate getopts;
 extern crate libc;
 
+use std::ffi::c_str_to_bytes;
 use std::mem::uninitialized;
 use std::io::print;
 use c_types::utsname;
@@ -35,15 +36,19 @@ extern {
     fn uname(uts: *mut utsname);
 }
 
+unsafe fn string_from_c_str(ptr: *const i8) -> String {
+    String::from_utf8_lossy(c_str_to_bytes(&ptr)).to_string()
+}
+
 unsafe fn getuname() -> utsrust {
     let mut uts: utsname = uninitialized();
     uname(&mut uts);
     utsrust {
-        sysname:  String::from_raw_buf(uts.sysname.as_ptr()  as *const u8), 
-        nodename: String::from_raw_buf(uts.nodename.as_ptr() as *const u8),
-        release:  String::from_raw_buf(uts.release.as_ptr()  as *const u8), 
-        version:  String::from_raw_buf(uts.version.as_ptr()  as *const u8),
-        machine:  String::from_raw_buf(uts.machine.as_ptr()  as *const u8)
+        sysname:  string_from_c_str(uts.sysname.as_ptr()  as *const i8), 
+        nodename: string_from_c_str(uts.nodename.as_ptr() as *const i8),
+        release:  string_from_c_str(uts.release.as_ptr()  as *const i8), 
+        version:  string_from_c_str(uts.version.as_ptr()  as *const i8),
+        machine:  string_from_c_str(uts.machine.as_ptr()  as *const i8)
     }
 }
 
diff --git a/src/users/users.rs b/src/users/users.rs
index 122de7022..39bc99220 100644
--- a/src/users/users.rs
+++ b/src/users/users.rs
@@ -17,6 +17,7 @@
 extern crate getopts;
 extern crate libc;
 
+use std::ffi::c_str_to_bytes;
 use std::io::print;
 use std::mem;
 use std::ptr;
@@ -107,7 +108,7 @@ fn exec(filename: &str) {
             }
 
             if (*line).ut_type == USER_PROCESS {
-                let user = String::from_raw_buf(mem::transmute(&(*line).ut_user));
+                let user = String::from_utf8_lossy(c_str_to_bytes(mem::transmute(&(*line).ut_user))).to_string();
                 users.push(user);
             }
         }