libstd => 2018

40 files changed, 351 insertions, 365 deletions

diff --git a/src/libstd/sys/unix/alloc.rs b/src/libstd/sys/unix/alloc.rs
index 93e8e0e6696..8e8f5017da7 100644
--- a/src/libstd/sys/unix/alloc.rs
+++ b/src/libstd/sys/unix/alloc.rs
@@ -1,7 +1,6 @@
-use ptr;
-use libc;
-use sys_common::alloc::{MIN_ALIGN, realloc_fallback};
-use alloc::{GlobalAlloc, Layout, System};
+use crate::ptr;
+use crate::sys_common::alloc::{MIN_ALIGN, realloc_fallback};
+use crate::alloc::{GlobalAlloc, Layout, System};
 
 #[stable(feature = "alloc_system_type", since = "1.28.0")]
 unsafe impl GlobalAlloc for System {
diff --git a/src/libstd/sys/unix/android.rs b/src/libstd/sys/unix/android.rs
index 986fa27ede6..6774160bb25 100644
--- a/src/libstd/sys/unix/android.rs
+++ b/src/libstd/sys/unix/android.rs
@@ -21,7 +21,7 @@
 use libc::{c_int, c_void, sighandler_t, size_t, ssize_t};
 use libc::{ftruncate, pread, pwrite};
 
-use io;
+use crate::io;
 use super::{cvt, cvt_r};
 
 // The `log2` and `log2f` functions apparently appeared in android-18, or at
@@ -49,12 +49,12 @@ use super::{cvt, cvt_r};
 
 #[cfg(not(test))]
 pub fn log2f32(f: f32) -> f32 {
-    f.ln() * ::f32::consts::LOG2_E
+    f.ln() * crate::f32::consts::LOG2_E
 }
 
 #[cfg(not(test))]
 pub fn log2f64(f: f64) -> f64 {
-    f.ln() * ::f64::consts::LOG2_E
+    f.ln() * crate::f64::consts::LOG2_E
 }
 
 // Back in the day [1] the `signal` function was just an inline wrapper
@@ -117,7 +117,7 @@ pub fn ftruncate64(fd: c_int, size: u64) -> io::Result<()> {
 pub unsafe fn cvt_pread64(fd: c_int, buf: *mut c_void, count: size_t, offset: i64)
     -> io::Result<ssize_t>
 {
-    use convert::TryInto;
+    use crate::convert::TryInto;
     weak!(fn pread64(c_int, *mut c_void, size_t, i64) -> ssize_t);
     pread64.get().map(|f| cvt(f(fd, buf, count, offset))).unwrap_or_else(|| {
         if let Ok(o) = offset.try_into() {
@@ -133,7 +133,7 @@ pub unsafe fn cvt_pread64(fd: c_int, buf: *mut c_void, count: size_t, offset: i6
 pub unsafe fn cvt_pwrite64(fd: c_int, buf: *const c_void, count: size_t, offset: i64)
     -> io::Result<ssize_t>
 {
-    use convert::TryInto;
+    use crate::convert::TryInto;
     weak!(fn pwrite64(c_int, *const c_void, size_t, i64) -> ssize_t);
     pwrite64.get().map(|f| cvt(f(fd, buf, count, offset))).unwrap_or_else(|| {
         if let Ok(o) = offset.try_into() {
diff --git a/src/libstd/sys/unix/args.rs b/src/libstd/sys/unix/args.rs
index db1c5f4fea5..18de1096df2 100644
--- a/src/libstd/sys/unix/args.rs
+++ b/src/libstd/sys/unix/args.rs
@@ -5,9 +5,9 @@
 
 #![allow(dead_code)] // runtime init functions not used during testing
 
-use ffi::OsString;
-use marker::PhantomData;
-use vec;
+use crate::ffi::OsString;
+use crate::marker::PhantomData;
+use crate::vec;
 
 /// One-time global initialization.
 pub unsafe fn init(argc: isize, argv: *const *const u8) { imp::init(argc, argv) }
@@ -59,14 +59,13 @@ impl DoubleEndedIterator for Args {
           target_os = "fuchsia",
           target_os = "hermit"))]
 mod imp {
-    use os::unix::prelude::*;
-    use ptr;
-    use ffi::{CStr, OsString};
-    use marker::PhantomData;
-    use libc;
+    use crate::os::unix::prelude::*;
+    use crate::ptr;
+    use crate::ffi::{CStr, OsString};
+    use crate::marker::PhantomData;
     use super::Args;
 
-    use sys_common::mutex::Mutex;
+    use crate::sys_common::mutex::Mutex;
 
     static mut ARGC: isize = 0;
     static mut ARGV: *const *const u8 = ptr::null();
@@ -107,9 +106,8 @@ mod imp {
 #[cfg(any(target_os = "macos",
           target_os = "ios"))]
 mod imp {
-    use ffi::CStr;
-    use marker::PhantomData;
-    use libc;
+    use crate::ffi::CStr;
+    use crate::marker::PhantomData;
     use super::Args;
 
     pub unsafe fn init(_argc: isize, _argv: *const *const u8) {
@@ -120,7 +118,7 @@ mod imp {
 
     #[cfg(target_os = "macos")]
     pub fn args() -> Args {
-        use os::unix::prelude::*;
+        use crate::os::unix::prelude::*;
         extern {
             // These functions are in crt_externs.h.
             fn _NSGetArgc() -> *mut libc::c_int;
@@ -155,9 +153,9 @@ mod imp {
     // res
     #[cfg(target_os = "ios")]
     pub fn args() -> Args {
-        use ffi::OsString;
-        use mem;
-        use str;
+        use crate::ffi::OsString;
+        use crate::mem;
+        use crate::str;
 
         extern {
             fn sel_registerName(name: *const libc::c_uchar) -> Sel;
diff --git a/src/libstd/sys/unix/backtrace/mod.rs b/src/libstd/sys/unix/backtrace/mod.rs
index 79c3e39d8f8..0887e5a4df9 100644
--- a/src/libstd/sys/unix/backtrace/mod.rs
+++ b/src/libstd/sys/unix/backtrace/mod.rs
@@ -83,8 +83,9 @@ mod printing;
 
 #[cfg(not(target_os = "emscripten"))]
 pub mod gnu {
-    use io;
-    use fs;
+    use crate::io;
+    use crate::fs;
+
     use libc::c_char;
 
     #[cfg(not(any(target_os = "macos", target_os = "ios")))]
@@ -94,8 +95,8 @@ pub mod gnu {
 
     #[cfg(any(target_os = "macos", target_os = "ios"))]
     pub fn get_executable_filename() -> io::Result<(Vec<c_char>, fs::File)> {
-        use env;
-        use os::unix::ffi::OsStrExt;
+        use crate::env;
+        use crate::os::unix::ffi::OsStrExt;
 
         let filename = env::current_exe()?;
         let file = fs::File::open(&filename)?;
diff --git a/src/libstd/sys/unix/backtrace/printing/dladdr.rs b/src/libstd/sys/unix/backtrace/printing/dladdr.rs
index 09715db8c1a..cf3bda640e9 100644
--- a/src/libstd/sys/unix/backtrace/printing/dladdr.rs
+++ b/src/libstd/sys/unix/backtrace/printing/dladdr.rs
@@ -1,9 +1,8 @@
-use io;
-use intrinsics;
-use ffi::CStr;
-use libc;
-use sys::backtrace::BacktraceContext;
-use sys_common::backtrace::Frame;
+use crate::io;
+use crate::intrinsics;
+use crate::ffi::CStr;
+use crate::sys::backtrace::BacktraceContext;
+use crate::sys_common::backtrace::Frame;
 
 pub fn resolve_symname<F>(frame: Frame,
                           callback: F,
diff --git a/src/libstd/sys/unix/backtrace/printing/mod.rs b/src/libstd/sys/unix/backtrace/printing/mod.rs
index d0303e6995f..d090caede43 100644
--- a/src/libstd/sys/unix/backtrace/printing/mod.rs
+++ b/src/libstd/sys/unix/backtrace/printing/mod.rs
@@ -1,8 +1,8 @@
 mod dladdr;
 
-use sys::backtrace::BacktraceContext;
-use sys_common::backtrace::Frame;
-use io;
+use crate::sys::backtrace::BacktraceContext;
+use crate::sys_common::backtrace::Frame;
+use crate::io;
 
 #[cfg(target_os = "emscripten")]
 pub use self::dladdr::resolve_symname;
@@ -16,14 +16,14 @@ where
 }
 
 #[cfg(not(target_os = "emscripten"))]
-pub use sys_common::gnu::libbacktrace::foreach_symbol_fileline;
+pub use crate::sys_common::gnu::libbacktrace::foreach_symbol_fileline;
 
 #[cfg(not(target_os = "emscripten"))]
 pub fn resolve_symname<F>(frame: Frame, callback: F, bc: &BacktraceContext) -> io::Result<()>
 where
     F: FnOnce(Option<&str>) -> io::Result<()>
 {
-    ::sys_common::gnu::libbacktrace::resolve_symname(frame, |symname| {
+    crate::sys_common::gnu::libbacktrace::resolve_symname(frame, |symname| {
         if symname.is_some() {
             callback(symname)
         } else {
diff --git a/src/libstd/sys/unix/backtrace/tracing/backtrace_fn.rs b/src/libstd/sys/unix/backtrace/tracing/backtrace_fn.rs
index 236762c5eb5..a628d107ad6 100644
--- a/src/libstd/sys/unix/backtrace/tracing/backtrace_fn.rs
+++ b/src/libstd/sys/unix/backtrace/tracing/backtrace_fn.rs
@@ -8,10 +8,10 @@
 /// simple to use it should be used only on iOS devices as the only viable
 /// option.
 
-use io;
-use libc;
-use sys::backtrace::BacktraceContext;
-use sys_common::backtrace::Frame;
+use crate::io;
+use crate::ptr;
+use crate::sys::backtrace::BacktraceContext;
+use crate::sys_common::backtrace::Frame;
 
 #[inline(never)] // if we know this is a function call, we can skip it when
                  // tracing
@@ -20,7 +20,7 @@ pub fn unwind_backtrace(frames: &mut [Frame])
 {
     const FRAME_LEN: usize = 100;
     assert!(FRAME_LEN >= frames.len());
-    let mut raw_frames = [::ptr::null_mut(); FRAME_LEN];
+    let mut raw_frames = [ptr::null_mut(); FRAME_LEN];
     let nb_frames = unsafe {
         backtrace(raw_frames.as_mut_ptr(), raw_frames.len() as libc::c_int)
     } as usize;
diff --git a/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs b/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs
index 72a7968c514..abbeca0fde6 100644
--- a/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs
+++ b/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs
@@ -1,8 +1,8 @@
-use error::Error;
-use io;
-use libc;
-use sys::backtrace::BacktraceContext;
-use sys_common::backtrace::Frame;
+use crate::error::Error;
+use crate::fmt;
+use crate::io;
+use crate::sys::backtrace::BacktraceContext;
+use crate::sys_common::backtrace::Frame;
 
 use unwind as uw;
 
@@ -20,8 +20,8 @@ impl Error for UnwindError {
     }
 }
 
-impl ::fmt::Display for UnwindError {
-    fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
+impl fmt::Display for UnwindError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f, "{}: {:?}", self.description(), self.0)
     }
 }
diff --git a/src/libstd/sys/unix/condvar.rs b/src/libstd/sys/unix/condvar.rs
index 3e048d5c6e4..47fb6792f08 100644
--- a/src/libstd/sys/unix/condvar.rs
+++ b/src/libstd/sys/unix/condvar.rs
@@ -1,7 +1,6 @@
-use cell::UnsafeCell;
-use libc;
-use sys::mutex::{self, Mutex};
-use time::Duration;
+use crate::cell::UnsafeCell;
+use crate::sys::mutex::{self, Mutex};
+use crate::time::Duration;
 
 pub struct Condvar { inner: UnsafeCell<libc::pthread_cond_t> }
 
@@ -41,7 +40,7 @@ impl Condvar {
                   target_os = "android",
                   target_os = "hermit")))]
     pub unsafe fn init(&mut self) {
-        use mem;
+        use crate::mem;
         let mut attr: libc::pthread_condattr_t = mem::uninitialized();
         let r = libc::pthread_condattr_init(&mut attr);
         assert_eq!(r, 0);
@@ -80,7 +79,7 @@ impl Condvar {
                   target_os = "android",
                   target_os = "hermit")))]
     pub unsafe fn wait_timeout(&self, mutex: &Mutex, dur: Duration) -> bool {
-        use mem;
+        use crate::mem;
 
         let mut now: libc::timespec = mem::zeroed();
         let r = libc::clock_gettime(libc::CLOCK_MONOTONIC, &mut now);
@@ -110,8 +109,8 @@ impl Condvar {
     // https://github.com/llvm-mirror/libcxx/blob/release_35/include/__mutex_base#L367
     #[cfg(any(target_os = "macos", target_os = "ios", target_os = "android", target_os = "hermit"))]
     pub unsafe fn wait_timeout(&self, mutex: &Mutex, mut dur: Duration) -> bool {
-        use ptr;
-        use time::Instant;
+        use crate::ptr;
+        use crate::time::Instant;
 
         // 1000 years
         let max_dur = Duration::from_secs(1000 * 365 * 86400);
diff --git a/src/libstd/sys/unix/ext/ffi.rs b/src/libstd/sys/unix/ext/ffi.rs
index d1c3cd82ac5..0c023239815 100644
--- a/src/libstd/sys/unix/ext/ffi.rs
+++ b/src/libstd/sys/unix/ext/ffi.rs
@@ -2,10 +2,10 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
-use ffi::{OsStr, OsString};
-use mem;
-use sys::os_str::Buf;
-use sys_common::{FromInner, IntoInner, AsInner};
+use crate::ffi::{OsStr, OsString};
+use crate::mem;
+use crate::sys::os_str::Buf;
+use crate::sys_common::{FromInner, IntoInner, AsInner};
 
 /// Unix-specific extensions to [`OsString`].
 ///
diff --git a/src/libstd/sys/unix/ext/fs.rs b/src/libstd/sys/unix/ext/fs.rs
index abcce3ab829..d9baac993c4 100644
--- a/src/libstd/sys/unix/ext/fs.rs
+++ b/src/libstd/sys/unix/ext/fs.rs
@@ -2,13 +2,12 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
-use fs::{self, Permissions, OpenOptions};
-use io;
-use libc;
-use path::Path;
-use sys;
-use sys_common::{FromInner, AsInner, AsInnerMut};
-use sys::platform::fs::MetadataExt as UnixMetadataExt;
+use crate::fs::{self, Permissions, OpenOptions};
+use crate::io;
+use crate::path::Path;
+use crate::sys;
+use crate::sys_common::{FromInner, AsInner, AsInnerMut};
+use crate::sys::platform::fs::MetadataExt as UnixMetadataExt;
 
 /// Unix-specific extensions to [`File`].
 ///
diff --git a/src/libstd/sys/unix/ext/io.rs b/src/libstd/sys/unix/ext/io.rs
index 73f4879e4e4..1a0b3b8962b 100644
--- a/src/libstd/sys/unix/ext/io.rs
+++ b/src/libstd/sys/unix/ext/io.rs
@@ -2,12 +2,11 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
-use fs;
-use os::raw;
-use sys;
-use io;
-use sys_common::{AsInner, FromInner, IntoInner};
-use libc;
+use crate::fs;
+use crate::os::raw;
+use crate::sys;
+use crate::io;
+use crate::sys_common::{AsInner, FromInner, IntoInner};
 
 /// Raw file descriptors.
 #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/src/libstd/sys/unix/ext/net.rs b/src/libstd/sys/unix/ext/net.rs
index 4b60ea654c1..4fc79efe7ce 100644
--- a/src/libstd/sys/unix/ext/net.rs
+++ b/src/libstd/sys/unix/ext/net.rs
@@ -15,19 +15,19 @@ mod libc {
     pub struct sockaddr_un;
 }
 
-use ascii;
-use ffi::OsStr;
-use fmt;
-use io::{self, Initializer, IoVec, IoVecMut};
-use mem;
-use net::{self, Shutdown};
-use os::unix::ffi::OsStrExt;
-use os::unix::io::{RawFd, AsRawFd, FromRawFd, IntoRawFd};
-use path::Path;
-use time::Duration;
-use sys::{self, cvt};
-use sys::net::Socket;
-use sys_common::{self, AsInner, FromInner, IntoInner};
+use crate::ascii;
+use crate::ffi::OsStr;
+use crate::fmt;
+use crate::io::{self, Initializer, IoVec, IoVecMut};
+use crate::mem;
+use crate::net::{self, Shutdown};
+use crate::os::unix::ffi::OsStrExt;
+use crate::os::unix::io::{RawFd, AsRawFd, FromRawFd, IntoRawFd};
+use crate::path::Path;
+use crate::time::Duration;
+use crate::sys::{self, cvt};
+use crate::sys::net::Socket;
+use crate::sys_common::{self, AsInner, FromInner, IntoInner};
 
 #[cfg(any(target_os = "linux", target_os = "android",
           target_os = "dragonfly", target_os = "freebsd",
@@ -1481,11 +1481,11 @@ impl IntoRawFd for UnixDatagram {
 
 #[cfg(all(test, not(target_os = "emscripten")))]
 mod test {
-    use thread;
-    use io::{self, ErrorKind};
-    use io::prelude::*;
-    use time::Duration;
-    use sys_common::io::test::tmpdir;
+    use crate::thread;
+    use crate::io::{self, ErrorKind};
+    use crate::io::prelude::*;
+    use crate::time::Duration;
+    use crate::sys_common::io::test::tmpdir;
 
     use super::*;
 
diff --git a/src/libstd/sys/unix/ext/process.rs b/src/libstd/sys/unix/ext/process.rs
index b487bb889ba..7ace95edef9 100644
--- a/src/libstd/sys/unix/ext/process.rs
+++ b/src/libstd/sys/unix/ext/process.rs
@@ -2,11 +2,11 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
-use io;
-use os::unix::io::{FromRawFd, RawFd, AsRawFd, IntoRawFd};
-use process;
-use sys;
-use sys_common::{AsInnerMut, AsInner, FromInner, IntoInner};
+use crate::io;
+use crate::os::unix::io::{FromRawFd, RawFd, AsRawFd, IntoRawFd};
+use crate::process;
+use crate::sys;
+use crate::sys_common::{AsInnerMut, AsInner, FromInner, IntoInner};
 
 /// Unix-specific extensions to the [`process::Command`] builder.
 ///
@@ -209,5 +209,5 @@ impl IntoRawFd for process::ChildStderr {
 /// Returns the OS-assigned process identifier associated with this process's parent.
 #[stable(feature = "unix_ppid", since = "1.27.0")]
 pub fn parent_id() -> u32 {
-    ::sys::os::getppid()
+    crate::sys::os::getppid()
 }
diff --git a/src/libstd/sys/unix/ext/raw.rs b/src/libstd/sys/unix/ext/raw.rs
index eabb4b02503..75ae54a919a 100644
--- a/src/libstd/sys/unix/ext/raw.rs
+++ b/src/libstd/sys/unix/ext/raw.rs
@@ -14,10 +14,10 @@
 
 #[doc(inline)]
 #[stable(feature = "pthread_t", since = "1.8.0")]
-pub use sys::platform::raw::pthread_t;
+pub use crate::sys::platform::raw::pthread_t;
 #[doc(inline)]
 #[stable(feature = "raw_ext", since = "1.1.0")]
-pub use sys::platform::raw::{dev_t, ino_t, mode_t, nlink_t, off_t, blksize_t};
+pub use crate::sys::platform::raw::{dev_t, ino_t, mode_t, nlink_t, off_t, blksize_t};
 #[doc(inline)]
 #[stable(feature = "raw_ext", since = "1.1.0")]
-pub use sys::platform::raw::{blkcnt_t, time_t};
+pub use crate::sys::platform::raw::{blkcnt_t, time_t};
diff --git a/src/libstd/sys/unix/ext/thread.rs b/src/libstd/sys/unix/ext/thread.rs
index 4b3d5e31848..759ef6236e8 100644
--- a/src/libstd/sys/unix/ext/thread.rs
+++ b/src/libstd/sys/unix/ext/thread.rs
@@ -3,9 +3,9 @@
 #![stable(feature = "thread_extensions", since = "1.9.0")]
 
 #[allow(deprecated)]
-use os::unix::raw::pthread_t;
-use sys_common::{AsInner, IntoInner};
-use thread::JoinHandle;
+use crate::os::unix::raw::pthread_t;
+use crate::sys_common::{AsInner, IntoInner};
+use crate::thread::JoinHandle;
 
 #[stable(feature = "thread_extensions", since = "1.9.0")]
 #[allow(deprecated)]
diff --git a/src/libstd/sys/unix/fast_thread_local.rs b/src/libstd/sys/unix/fast_thread_local.rs
index 742ffd12b88..17478dce4fe 100644
--- a/src/libstd/sys/unix/fast_thread_local.rs
+++ b/src/libstd/sys/unix/fast_thread_local.rs
@@ -12,9 +12,8 @@
 // Due to rust-lang/rust#18804, make sure this is not generic!
 #[cfg(any(target_os = "linux", target_os = "fuchsia", target_os = "hermit"))]
 pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern fn(*mut u8)) {
-    use libc;
-    use mem;
-    use sys_common::thread_local::register_dtor_fallback;
+    use crate::mem;
+    use crate::sys_common::thread_local::register_dtor_fallback;
 
     extern {
         #[linkage = "extern_weak"]
@@ -45,8 +44,8 @@ pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern fn(*mut u8)) {
 // _tlv_atexit.
 #[cfg(target_os = "macos")]
 pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern fn(*mut u8)) {
-    use cell::Cell;
-    use ptr;
+    use crate::cell::Cell;
+    use crate::ptr;
 
     #[thread_local]
     static REGISTERED: Cell<bool> = Cell::new(false);
diff --git a/src/libstd/sys/unix/fd.rs b/src/libstd/sys/unix/fd.rs
index 6946b7b5dfa..c274ad26cb1 100644
--- a/src/libstd/sys/unix/fd.rs
+++ b/src/libstd/sys/unix/fd.rs
@@ -1,12 +1,13 @@
 #![unstable(reason = "not public", issue = "0", feature = "fd")]
 
-use cmp;
-use io::{self, Read, Initializer, IoVec, IoVecMut};
-use libc::{self, c_int, c_void, ssize_t};
-use mem;
-use sync::atomic::{AtomicBool, Ordering};
-use sys::cvt;
-use sys_common::AsInner;
+use crate::cmp;
+use crate::io::{self, Read, Initializer, IoVec, IoVecMut};
+use crate::mem;
+use crate::sync::atomic::{AtomicBool, Ordering};
+use crate::sys::cvt;
+use crate::sys_common::AsInner;
+
+use libc::{c_int, c_void, ssize_t};
 
 #[derive(Debug)]
 pub struct FileDesc {
@@ -74,7 +75,7 @@ impl FileDesc {
         unsafe fn cvt_pread64(fd: c_int, buf: *mut c_void, count: usize, offset: i64)
             -> io::Result<isize>
         {
-            use convert::TryInto;
+            use crate::convert::TryInto;
             use libc::pread64;
             // pread64 on emscripten actually takes a 32 bit offset
             if let Ok(o) = offset.try_into() {
@@ -131,7 +132,7 @@ impl FileDesc {
         unsafe fn cvt_pwrite64(fd: c_int, buf: *const c_void, count: usize, offset: i64)
             -> io::Result<isize>
         {
-            use convert::TryInto;
+            use crate::convert::TryInto;
             use libc::pwrite64;
             // pwrite64 on emscripten actually takes a 32 bit offset
             if let Ok(o) = offset.try_into() {
diff --git a/src/libstd/sys/unix/fs.rs b/src/libstd/sys/unix/fs.rs
index 5183d6fadd2..3b80b475a93 100644
--- a/src/libstd/sys/unix/fs.rs
+++ b/src/libstd/sys/unix/fs.rs
@@ -1,17 +1,18 @@
-use os::unix::prelude::*;
-
-use ffi::{CString, CStr, OsString, OsStr};
-use fmt;
-use io::{self, Error, ErrorKind, SeekFrom};
-use libc::{self, c_int, mode_t};
-use mem;
-use path::{Path, PathBuf};
-use ptr;
-use sync::Arc;
-use sys::fd::FileDesc;
-use sys::time::SystemTime;
-use sys::{cvt, cvt_r};
-use sys_common::{AsInner, FromInner};
+use crate::os::unix::prelude::*;
+
+use crate::ffi::{CString, CStr, OsString, OsStr};
+use crate::fmt;
+use crate::io::{self, Error, ErrorKind, SeekFrom};
+use crate::mem;
+use crate::path::{Path, PathBuf};
+use crate::ptr;
+use crate::sync::Arc;
+use crate::sys::fd::FileDesc;
+use crate::sys::time::SystemTime;
+use crate::sys::{cvt, cvt_r};
+use crate::sys_common::{AsInner, FromInner};
+
+use libc::{c_int, mode_t};
 
 #[cfg(any(target_os = "linux", target_os = "emscripten", target_os = "l4re"))]
 use libc::{stat64, fstat64, lstat64, off64_t, ftruncate64, lseek64, dirent64, readdir64_r, open64};
@@ -217,6 +218,8 @@ impl Iterator for ReadDir {
 
     #[cfg(any(target_os = "solaris", target_os = "fuchsia"))]
     fn next(&mut self) -> Option<io::Result<DirEntry>> {
+        use crate::slice;
+
         unsafe {
             loop {
                 // Although readdir_r(3) would be a correct function to use here because
@@ -239,8 +242,8 @@ impl Iterator for ReadDir {
 
                 let ret = DirEntry {
                     entry: *entry_ptr,
-                    name: ::slice::from_raw_parts(name as *const u8,
-                                                  namelen as usize).to_owned().into_boxed_slice(),
+                    name: slice::from_raw_parts(name as *const u8,
+                                                namelen as usize).to_owned().into_boxed_slice(),
                     dir: self.clone()
                 };
                 if ret.name_bytes() != b"." && ret.name_bytes() != b".." {
@@ -365,9 +368,10 @@ impl DirEntry {
               target_os = "dragonfly",
               target_os = "bitrig"))]
     fn name_bytes(&self) -> &[u8] {
+        use crate::slice;
         unsafe {
-            ::slice::from_raw_parts(self.entry.d_name.as_ptr() as *const u8,
-                                    self.entry.d_namlen as usize)
+            slice::from_raw_parts(self.entry.d_name.as_ptr() as *const u8,
+                                  self.entry.d_namlen as usize)
         }
     }
     #[cfg(any(target_os = "android",
@@ -475,7 +479,7 @@ impl File {
         // that we support, so we only do this on Linux currently.
         #[cfg(target_os = "linux")]
         fn ensure_cloexec(fd: &FileDesc) -> io::Result<()> {
-            use sync::atomic::{AtomicUsize, Ordering};
+            use crate::sync::atomic::{AtomicUsize, Ordering};
 
             const OPEN_CLOEXEC_UNKNOWN: usize = 0;
             const OPEN_CLOEXEC_SUPPORTED: usize = 1;
@@ -542,7 +546,7 @@ impl File {
 
     pub fn truncate(&self, size: u64) -> io::Result<()> {
         #[cfg(target_os = "android")]
-        return ::sys::android::ftruncate64(self.0.raw(), size);
+        return crate::sys::android::ftruncate64(self.0.raw(), size);
 
         #[cfg(not(target_os = "android"))]
         return cvt_r(|| unsafe {
@@ -825,7 +829,7 @@ pub fn canonicalize(p: &Path) -> io::Result<PathBuf> {
 
 #[cfg(not(any(target_os = "linux", target_os = "android")))]
 pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
-    use fs::File;
+    use crate::fs::File;
     if !from.is_file() {
         return Err(Error::new(ErrorKind::InvalidInput,
                               "the source path is not an existing regular file"))
@@ -842,9 +846,9 @@ pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
 
 #[cfg(any(target_os = "linux", target_os = "android"))]
 pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
-    use cmp;
-    use fs::File;
-    use sync::atomic::{AtomicBool, Ordering};
+    use crate::cmp;
+    use crate::fs::File;
+    use crate::sync::atomic::{AtomicBool, Ordering};
 
     // Kernel prior to 4.5 don't have copy_file_range
     // We store the availability in a global to avoid unnecessary syscalls
diff --git a/src/libstd/sys/unix/l4re.rs b/src/libstd/sys/unix/l4re.rs
index 4775e29fb57..b6e8cc73894 100644
--- a/src/libstd/sys/unix/l4re.rs
+++ b/src/libstd/sys/unix/l4re.rs
@@ -4,15 +4,15 @@ macro_rules! unimpl {
 
 pub mod net {
     #![allow(warnings)]
-    use fmt;
-    use io::{self, IoVec, IoVecMut};
-    use libc;
-    use net::{SocketAddr, Shutdown, Ipv4Addr, Ipv6Addr};
-    use sys_common::{AsInner, FromInner, IntoInner};
-    use sys::fd::FileDesc;
-    use time::Duration;
-    use convert::TryFrom;
-
+    use crate::fmt;
+    use crate::io::{self, IoVec, IoVecMut};
+    use crate::net::{SocketAddr, Shutdown, Ipv4Addr, Ipv6Addr};
+    use crate::sys_common::{AsInner, FromInner, IntoInner};
+    use crate::sys::fd::FileDesc;
+    use crate::time::Duration;
+    use crate::convert::TryFrom;
+
+    #[allow(unused_extern_crates)]
     pub extern crate libc as netc;
 
     pub struct Socket(FileDesc);
diff --git a/src/libstd/sys/unix/memchr.rs b/src/libstd/sys/unix/memchr.rs
index ec04a22a0d2..1984678bdde 100644
--- a/src/libstd/sys/unix/memchr.rs
+++ b/src/libstd/sys/unix/memchr.rs
@@ -2,8 +2,6 @@
 // Copyright 2015 Andrew Gallant, bluss and Nicolas Koch
 
 pub fn memchr(needle: u8, haystack: &[u8]) -> Option<usize> {
-    use libc;
-
     let p = unsafe {
         libc::memchr(
             haystack.as_ptr() as *const libc::c_void,
@@ -21,8 +19,6 @@ pub fn memrchr(needle: u8, haystack: &[u8]) -> Option<usize> {
 
     #[cfg(target_os = "linux")]
     fn memrchr_specific(needle: u8, haystack: &[u8]) -> Option<usize> {
-        use libc;
-
         // GNU's memrchr() will - unlike memchr() - error if haystack is empty.
         if haystack.is_empty() {return None}
         let p = unsafe {
@@ -40,7 +36,7 @@ pub fn memrchr(needle: u8, haystack: &[u8]) -> Option<usize> {
 
     #[cfg(not(target_os = "linux"))]
     fn memrchr_specific(needle: u8, haystack: &[u8]) -> Option<usize> {
-        ::core::slice::memchr::memrchr(needle, haystack)
+        core::slice::memchr::memrchr(needle, haystack)
     }
 
     memrchr_specific(needle, haystack)
diff --git a/src/libstd/sys/unix/mod.rs b/src/libstd/sys/unix/mod.rs
index 0de1a223fbd..fbe3444311e 100644
--- a/src/libstd/sys/unix/mod.rs
+++ b/src/libstd/sys/unix/mod.rs
@@ -1,24 +1,23 @@
 #![allow(missing_docs, nonstandard_style)]
 
-use io::ErrorKind;
-use libc;
-
-#[cfg(any(rustdoc, target_os = "linux"))] pub use os::linux as platform;
-
-#[cfg(all(not(rustdoc), target_os = "android"))]   pub use os::android as platform;
-#[cfg(all(not(rustdoc), target_os = "bitrig"))]    pub use os::bitrig as platform;
-#[cfg(all(not(rustdoc), target_os = "dragonfly"))] pub use os::dragonfly as platform;
-#[cfg(all(not(rustdoc), target_os = "freebsd"))]   pub use os::freebsd as platform;
-#[cfg(all(not(rustdoc), target_os = "haiku"))]     pub use os::haiku as platform;
-#[cfg(all(not(rustdoc), target_os = "ios"))]       pub use os::ios as platform;
-#[cfg(all(not(rustdoc), target_os = "macos"))]     pub use os::macos as platform;
-#[cfg(all(not(rustdoc), target_os = "netbsd"))]    pub use os::netbsd as platform;
-#[cfg(all(not(rustdoc), target_os = "openbsd"))]   pub use os::openbsd as platform;
-#[cfg(all(not(rustdoc), target_os = "solaris"))]   pub use os::solaris as platform;
-#[cfg(all(not(rustdoc), target_os = "emscripten"))] pub use os::emscripten as platform;
-#[cfg(all(not(rustdoc), target_os = "fuchsia"))]   pub use os::fuchsia as platform;
-#[cfg(all(not(rustdoc), target_os = "l4re"))]      pub use os::linux as platform;
-#[cfg(all(not(rustdoc), target_os = "hermit"))]    pub use os::hermit as platform;
+use crate::io::ErrorKind;
+
+#[cfg(any(rustdoc, target_os = "linux"))] pub use crate::os::linux as platform;
+
+#[cfg(all(not(rustdoc), target_os = "android"))]   pub use crate::os::android as platform;
+#[cfg(all(not(rustdoc), target_os = "bitrig"))]    pub use crate::os::bitrig as platform;
+#[cfg(all(not(rustdoc), target_os = "dragonfly"))] pub use crate::os::dragonfly as platform;
+#[cfg(all(not(rustdoc), target_os = "freebsd"))]   pub use crate::os::freebsd as platform;
+#[cfg(all(not(rustdoc), target_os = "haiku"))]     pub use crate::os::haiku as platform;
+#[cfg(all(not(rustdoc), target_os = "ios"))]       pub use crate::os::ios as platform;
+#[cfg(all(not(rustdoc), target_os = "macos"))]     pub use crate::os::macos as platform;
+#[cfg(all(not(rustdoc), target_os = "netbsd"))]    pub use crate::os::netbsd as platform;
+#[cfg(all(not(rustdoc), target_os = "openbsd"))]   pub use crate::os::openbsd as platform;
+#[cfg(all(not(rustdoc), target_os = "solaris"))]   pub use crate::os::solaris as platform;
+#[cfg(all(not(rustdoc), target_os = "emscripten"))] pub use crate::os::emscripten as platform;
+#[cfg(all(not(rustdoc), target_os = "fuchsia"))]   pub use crate::os::fuchsia as platform;
+#[cfg(all(not(rustdoc), target_os = "l4re"))]      pub use crate::os::linux as platform;
+#[cfg(all(not(rustdoc), target_os = "hermit"))]    pub use crate::os::hermit as platform;
 
 pub use self::rand::hashmap_random_keys;
 pub use libc::strlen;
@@ -82,7 +81,7 @@ pub fn init() {
 }
 
 #[cfg(target_os = "android")]
-pub use sys::android::signal;
+pub use crate::sys::android::signal;
 #[cfg(not(target_os = "android"))]
 pub use libc::signal;
 
@@ -127,15 +126,15 @@ macro_rules! impl_is_minus_one {
 
 impl_is_minus_one! { i8 i16 i32 i64 isize }
 
-pub fn cvt<T: IsMinusOne>(t: T) -> ::io::Result<T> {
+pub fn cvt<T: IsMinusOne>(t: T) -> crate::io::Result<T> {
     if t.is_minus_one() {
-        Err(::io::Error::last_os_error())
+        Err(crate::io::Error::last_os_error())
     } else {
         Ok(t)
     }
 }
 
-pub fn cvt_r<T, F>(mut f: F) -> ::io::Result<T>
+pub fn cvt_r<T, F>(mut f: F) -> crate::io::Result<T>
     where T: IsMinusOne,
           F: FnMut() -> T
 {
@@ -155,5 +154,5 @@ pub fn cvt_r<T, F>(mut f: F) -> ::io::Result<T>
 // instruction" that intrinsics::abort would cause, as intrinsics::abort is
 // implemented as an illegal instruction.
 pub unsafe fn abort_internal() -> ! {
-    ::libc::abort()
+    libc::abort()
 }
diff --git a/src/libstd/sys/unix/mutex.rs b/src/libstd/sys/unix/mutex.rs
index 54429dc84b6..b6a22e1962a 100644
--- a/src/libstd/sys/unix/mutex.rs
+++ b/src/libstd/sys/unix/mutex.rs
@@ -1,6 +1,5 @@
-use cell::UnsafeCell;
-use libc;
-use mem;
+use crate::cell::UnsafeCell;
+use crate::mem;
 
 pub struct Mutex { inner: UnsafeCell<libc::pthread_mutex_t> }
 
@@ -74,7 +73,6 @@ impl Mutex {
     #[inline]
     #[cfg(target_os = "dragonfly")]
     pub unsafe fn destroy(&self) {
-        use libc;
         let r = libc::pthread_mutex_destroy(self.inner.get());
         // On DragonFly pthread_mutex_destroy() returns EINVAL if called on a
         // mutex that was just initialized with libc::PTHREAD_MUTEX_INITIALIZER.
diff --git a/src/libstd/sys/unix/net.rs b/src/libstd/sys/unix/net.rs
index 521d9b42517..8e8cdf837a9 100644
--- a/src/libstd/sys/unix/net.rs
+++ b/src/libstd/sys/unix/net.rs
@@ -1,16 +1,19 @@
-use ffi::CStr;
-use io::{self, IoVec, IoVecMut};
-use libc::{self, c_int, c_void, size_t, sockaddr, socklen_t, EAI_SYSTEM, MSG_PEEK};
-use mem;
-use net::{SocketAddr, Shutdown};
-use str;
-use sys::fd::FileDesc;
-use sys_common::{AsInner, FromInner, IntoInner};
-use sys_common::net::{getsockopt, setsockopt, sockaddr_to_addr};
-use time::{Duration, Instant};
-use cmp;
+use crate::ffi::CStr;
+use crate::io::{self, IoVec, IoVecMut};
+use crate::mem;
+use crate::net::{SocketAddr, Shutdown};
+use crate::str;
+use crate::sys::fd::FileDesc;
+use crate::sys_common::{AsInner, FromInner, IntoInner};
+use crate::sys_common::net::{getsockopt, setsockopt, sockaddr_to_addr};
+use crate::time::{Duration, Instant};
+use crate::cmp;
+
+use libc::{c_int, c_void, size_t, sockaddr, socklen_t, EAI_SYSTEM, MSG_PEEK};
 
 pub use sys::{cvt, cvt_r};
+
+#[allow(unused_extern_crates)]
 pub extern crate libc as netc;
 
 pub type wrlen_t = size_t;
@@ -384,7 +387,7 @@ impl IntoInner<c_int> for Socket {
 // believe it's thread-safe).
 #[cfg(target_env = "gnu")]
 fn on_resolver_failure() {
-    use sys;
+    use crate::sys;
 
     // If the version fails to parse, we treat it the same as "not glibc".
     if let Some(version) = sys::os::glibc_version() {
diff --git a/src/libstd/sys/unix/os.rs b/src/libstd/sys/unix/os.rs
index 58ea190fcc0..e16d50d437b 100644
--- a/src/libstd/sys/unix/os.rs
+++ b/src/libstd/sys/unix/os.rs
@@ -2,25 +2,26 @@
 
 #![allow(unused_imports)] // lots of cfg code here
 
-use os::unix::prelude::*;
-
-use error::Error as StdError;
-use ffi::{CString, CStr, OsString, OsStr};
-use fmt;
-use io;
-use iter;
-use libc::{self, c_int, c_char, c_void};
-use marker::PhantomData;
-use mem;
-use memchr;
-use path::{self, PathBuf};
-use ptr;
-use slice;
-use str;
-use sys_common::mutex::{Mutex, MutexGuard};
-use sys::cvt;
-use sys::fd;
-use vec;
+use crate::os::unix::prelude::*;
+
+use crate::error::Error as StdError;
+use crate::ffi::{CString, CStr, OsString, OsStr};
+use crate::fmt;
+use crate::io;
+use crate::iter;
+use crate::marker::PhantomData;
+use crate::mem;
+use crate::memchr;
+use crate::path::{self, PathBuf};
+use crate::ptr;
+use crate::slice;
+use crate::str;
+use crate::sys_common::mutex::{Mutex, MutexGuard};
+use crate::sys::cvt;
+use crate::sys::fd;
+use crate::vec;
+
+use libc::{c_int, c_char, c_void};
 
 const TMPBUF_SZ: usize = 128;
 
@@ -207,13 +208,13 @@ pub fn current_exe() -> io::Result<PathBuf> {
                        libc::KERN_PROC_PATHNAME as c_int,
                        -1 as c_int];
         let mut sz = 0;
-        cvt(libc::sysctl(mib.as_mut_ptr(), mib.len() as ::libc::c_uint,
+        cvt(libc::sysctl(mib.as_mut_ptr(), mib.len() as libc::c_uint,
                          ptr::null_mut(), &mut sz, ptr::null_mut(), 0))?;
         if sz == 0 {
             return Err(io::Error::last_os_error())
         }
         let mut v: Vec<u8> = Vec::with_capacity(sz);
-        cvt(libc::sysctl(mib.as_mut_ptr(), mib.len() as ::libc::c_uint,
+        cvt(libc::sysctl(mib.as_mut_ptr(), mib.len() as libc::c_uint,
                          v.as_mut_ptr() as *mut libc::c_void, &mut sz,
                          ptr::null_mut(), 0))?;
         if sz == 0 {
@@ -230,7 +231,7 @@ pub fn current_exe() -> io::Result<PathBuf> {
         unsafe {
             let mib = [libc::CTL_KERN, libc::KERN_PROC_ARGS, -1, libc::KERN_PROC_PATHNAME];
             let mut path_len: usize = 0;
-            cvt(libc::sysctl(mib.as_ptr(), mib.len() as ::libc::c_uint,
+            cvt(libc::sysctl(mib.as_ptr(), mib.len() as libc::c_uint,
                              ptr::null_mut(), &mut path_len,
                              ptr::null(), 0))?;
             if path_len <= 1 {
@@ -238,7 +239,7 @@ pub fn current_exe() -> io::Result<PathBuf> {
                            "KERN_PROC_PATHNAME sysctl returned zero-length string"))
             }
             let mut path: Vec<u8> = Vec::with_capacity(path_len);
-            cvt(libc::sysctl(mib.as_ptr(), mib.len() as ::libc::c_uint,
+            cvt(libc::sysctl(mib.as_ptr(), mib.len() as libc::c_uint,
                              path.as_ptr() as *mut libc::c_void, &mut path_len,
                              ptr::null(), 0))?;
             path.set_len(path_len - 1); // chop off NUL
@@ -248,7 +249,7 @@ pub fn current_exe() -> io::Result<PathBuf> {
     fn procfs() -> io::Result<PathBuf> {
         let curproc_exe = path::Path::new("/proc/curproc/exe");
         if curproc_exe.is_file() {
-            return ::fs::read_link(curproc_exe);
+            return crate::fs::read_link(curproc_exe);
         }
         Err(io::Error::new(io::ErrorKind::Other,
                            "/proc/curproc/exe doesn't point to regular file."))
@@ -277,7 +278,7 @@ pub fn current_exe() -> io::Result<PathBuf> {
         }
         let argv0 = CStr::from_ptr(argv[0]).to_bytes();
         if argv0[0] == b'.' || argv0.iter().any(|b| *b == b'/') {
-            ::fs::canonicalize(OsStr::from_bytes(argv0))
+            crate::fs::canonicalize(OsStr::from_bytes(argv0))
         } else {
             Ok(PathBuf::from(OsStr::from_bytes(argv0)))
         }
@@ -286,7 +287,7 @@ pub fn current_exe() -> io::Result<PathBuf> {
 
 #[cfg(any(target_os = "linux", target_os = "android", target_os = "emscripten"))]
 pub fn current_exe() -> io::Result<PathBuf> {
-    match ::fs::read_link("/proc/self/exe") {
+    match crate::fs::read_link("/proc/self/exe") {
         Err(ref e) if e.kind() == io::ErrorKind::NotFound => {
             Err(io::Error::new(
                 io::ErrorKind::Other,
@@ -373,7 +374,7 @@ pub fn current_exe() -> io::Result<PathBuf> {
         let result = _get_next_image_info(0, &mut cookie, &mut info,
             mem::size_of::<image_info>() as i32);
         if result != 0 {
-            use io::ErrorKind;
+            use crate::io::ErrorKind;
             Err(io::Error::new(ErrorKind::Other, "Error getting executable path"))
         } else {
             let name = CStr::from_ptr(info.name.as_ptr()).to_bytes();
@@ -384,7 +385,7 @@ pub fn current_exe() -> io::Result<PathBuf> {
 
 #[cfg(any(target_os = "fuchsia", target_os = "l4re", target_os = "hermit"))]
 pub fn current_exe() -> io::Result<PathBuf> {
-    use io::ErrorKind;
+    use crate::io::ErrorKind;
     Err(io::Error::new(ErrorKind::Other, "Not yet implemented!"))
 }
 
@@ -495,7 +496,7 @@ pub fn page_size() -> usize {
 }
 
 pub fn temp_dir() -> PathBuf {
-    ::env::var_os("TMPDIR").map(PathBuf::from).unwrap_or_else(|| {
+    crate::env::var_os("TMPDIR").map(PathBuf::from).unwrap_or_else(|| {
         if cfg!(target_os = "android") {
             PathBuf::from("/data/local/tmp")
         } else {
@@ -505,7 +506,7 @@ pub fn temp_dir() -> PathBuf {
 }
 
 pub fn home_dir() -> Option<PathBuf> {
-    return ::env::var_os("HOME").or_else(|| unsafe {
+    return crate::env::var_os("HOME").or_else(|| unsafe {
         fallback()
     }).map(PathBuf::from);
 
diff --git a/src/libstd/sys/unix/os_str.rs b/src/libstd/sys/unix/os_str.rs
index 9d5e084feb2..79b43458d00 100644
--- a/src/libstd/sys/unix/os_str.rs
+++ b/src/libstd/sys/unix/os_str.rs
@@ -1,14 +1,15 @@
 /// The underlying OsString/OsStr implementation on Unix systems: just
 /// a `Vec<u8>`/`[u8]`.
 
-use borrow::Cow;
-use fmt;
-use str;
-use mem;
-use rc::Rc;
-use sync::Arc;
-use sys_common::{AsInner, IntoInner};
-use sys_common::bytestring::debug_fmt_bytestring;
+use crate::borrow::Cow;
+use crate::fmt;
+use crate::str;
+use crate::mem;
+use crate::rc::Rc;
+use crate::sync::Arc;
+use crate::sys_common::{AsInner, IntoInner};
+use crate::sys_common::bytestring::debug_fmt_bytestring;
+
 use core::str::lossy::Utf8Lossy;
 
 #[derive(Clone, Hash)]
diff --git a/src/libstd/sys/unix/path.rs b/src/libstd/sys/unix/path.rs
index 2ef78fb2f86..5c062e7c97c 100644
--- a/src/libstd/sys/unix/path.rs
+++ b/src/libstd/sys/unix/path.rs
@@ -1,5 +1,5 @@
-use path::Prefix;
-use ffi::OsStr;
+use crate::path::Prefix;
+use crate::ffi::OsStr;
 
 #[inline]
 pub fn is_sep_byte(b: u8) -> bool {
diff --git a/src/libstd/sys/unix/pipe.rs b/src/libstd/sys/unix/pipe.rs
index a746d982c6c..bc3c026adab 100644
--- a/src/libstd/sys/unix/pipe.rs
+++ b/src/libstd/sys/unix/pipe.rs
@@ -1,9 +1,10 @@
-use io;
-use libc::{self, c_int};
-use mem;
-use sync::atomic::{AtomicBool, Ordering};
-use sys::fd::FileDesc;
-use sys::{cvt, cvt_r};
+use crate::io;
+use crate::mem;
+use crate::sync::atomic::{AtomicBool, Ordering};
+use crate::sys::fd::FileDesc;
+use crate::sys::{cvt, cvt_r};
+
+use libc::c_int;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Anonymous pipes
diff --git a/src/libstd/sys/unix/process/process_common.rs b/src/libstd/sys/unix/process/process_common.rs
index 7fa256e59b2..856d202be03 100644
--- a/src/libstd/sys/unix/process/process_common.rs
+++ b/src/libstd/sys/unix/process/process_common.rs
@@ -1,15 +1,16 @@
-use os::unix::prelude::*;
-
-use ffi::{OsString, OsStr, CString, CStr};
-use fmt;
-use io;
-use libc::{self, c_int, gid_t, uid_t, c_char, EXIT_SUCCESS, EXIT_FAILURE};
-use ptr;
-use sys::fd::FileDesc;
-use sys::fs::{File, OpenOptions};
-use sys::pipe::{self, AnonPipe};
-use sys_common::process::{CommandEnv, DefaultEnvKey};
-use collections::BTreeMap;
+use crate::os::unix::prelude::*;
+
+use crate::ffi::{OsString, OsStr, CString, CStr};
+use crate::fmt;
+use crate::io;
+use crate::ptr;
+use crate::sys::fd::FileDesc;
+use crate::sys::fs::{File, OpenOptions};
+use crate::sys::pipe::{self, AnonPipe};
+use crate::sys_common::process::{CommandEnv, DefaultEnvKey};
+use crate::collections::BTreeMap;
+
+use libc::{c_int, gid_t, uid_t, c_char, EXIT_SUCCESS, EXIT_FAILURE};
 
 ////////////////////////////////////////////////////////////////////////////////
 // Command
@@ -406,11 +407,10 @@ impl ExitCode {
 mod tests {
     use super::*;
 
-    use ffi::OsStr;
-    use mem;
-    use ptr;
-    use libc;
-    use sys::cvt;
+    use crate::ffi::OsStr;
+    use crate::mem;
+    use crate::ptr;
+    use crate::sys::cvt;
 
     macro_rules! t {
         ($e:expr) => {
@@ -443,7 +443,7 @@ mod tests {
 
     #[cfg(target_os = "android")]
     unsafe fn sigaddset(set: *mut libc::sigset_t, signum: libc::c_int) -> libc::c_int {
-        use slice;
+        use crate::slice;
 
         let raw = slice::from_raw_parts_mut(set as *mut u8, mem::size_of::<libc::sigset_t>());
         let bit = (signum - 1) as usize;
diff --git a/src/libstd/sys/unix/process/process_fuchsia.rs b/src/libstd/sys/unix/process/process_fuchsia.rs
index 5582310adbf..7c6be9b0a60 100644
--- a/src/libstd/sys/unix/process/process_fuchsia.rs
+++ b/src/libstd/sys/unix/process/process_fuchsia.rs
@@ -1,10 +1,11 @@
-use io;
-use libc::{self, size_t};
-use mem;
-use ptr;
+use crate::io;
+use crate::mem;
+use crate::ptr;
 
-use sys::process::zircon::{Handle, zx_handle_t};
-use sys::process::process_common::*;
+use crate::sys::process::zircon::{Handle, zx_handle_t};
+use crate::sys::process::process_common::*;
+
+use libc::size_t;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Command
@@ -44,7 +45,7 @@ impl Command {
 
     unsafe fn do_exec(&mut self, stdio: ChildPipes, maybe_envp: Option<&CStringArray>)
                       -> io::Result<zx_handle_t> {
-        use sys::process::zircon::*;
+        use crate::sys::process::zircon::*;
 
         let envp = match maybe_envp {
             Some(envp) => envp.as_ptr(),
@@ -109,7 +110,7 @@ impl Process {
     }
 
     pub fn kill(&mut self) -> io::Result<()> {
-        use sys::process::zircon::*;
+        use crate::sys::process::zircon::*;
 
         unsafe { zx_cvt(zx_task_kill(self.handle.raw()))?; }
 
@@ -117,8 +118,8 @@ impl Process {
     }
 
     pub fn wait(&mut self) -> io::Result<ExitStatus> {
-        use default::Default;
-        use sys::process::zircon::*;
+        use crate::default::Default;
+        use crate::sys::process::zircon::*;
 
         let mut proc_info: zx_info_process_t = Default::default();
         let mut actual: size_t = 0;
@@ -140,8 +141,8 @@ impl Process {
     }
 
     pub fn try_wait(&mut self) -> io::Result<Option<ExitStatus>> {
-        use default::Default;
-        use sys::process::zircon::*;
+        use crate::default::Default;
+        use crate::sys::process::zircon::*;
 
         let mut proc_info: zx_info_process_t = Default::default();
         let mut actual: size_t = 0;
diff --git a/src/libstd/sys/unix/process/process_unix.rs b/src/libstd/sys/unix/process/process_unix.rs
index 6fbbbb349b1..220b1fd4531 100644
--- a/src/libstd/sys/unix/process/process_unix.rs
+++ b/src/libstd/sys/unix/process/process_unix.rs
@@ -1,9 +1,10 @@
-use io::{self, Error, ErrorKind};
-use libc::{self, c_int, gid_t, pid_t, uid_t};
-use ptr;
-use sys::cvt;
-use sys::process::process_common::*;
-use sys;
+use crate::io::{self, Error, ErrorKind};
+use crate::ptr;
+use crate::sys::cvt;
+use crate::sys::process::process_common::*;
+use crate::sys;
+
+use libc::{c_int, gid_t, pid_t, uid_t};
 
 ////////////////////////////////////////////////////////////////////////////////
 // Command
@@ -164,7 +165,7 @@ impl Command {
         stdio: ChildPipes,
         maybe_envp: Option<&CStringArray>
     ) -> io::Error {
-        use sys::{self, cvt_r};
+        use crate::sys::{self, cvt_r};
 
         macro_rules! t {
             ($e:expr) => (match $e {
@@ -207,7 +208,7 @@ impl Command {
         // emscripten has no signal support.
         #[cfg(not(any(target_os = "emscripten")))]
         {
-            use mem;
+            use crate::mem;
             // Reset signal handling so the child process starts in a
             // standardized state. libstd ignores SIGPIPE, and signal-handling
             // libraries often set a mask. Child processes inherit ignored
@@ -278,8 +279,8 @@ impl Command {
     fn posix_spawn(&mut self, stdio: &ChildPipes, envp: Option<&CStringArray>)
         -> io::Result<Option<Process>>
     {
-        use mem;
-        use sys;
+        use crate::mem;
+        use crate::sys;
 
         if self.get_gid().is_some() ||
             self.get_uid().is_some() ||
@@ -427,7 +428,7 @@ impl Process {
     }
 
     pub fn wait(&mut self) -> io::Result<ExitStatus> {
-        use sys::cvt_r;
+        use crate::sys::cvt_r;
         if let Some(status) = self.status {
             return Ok(status)
         }
diff --git a/src/libstd/sys/unix/process/zircon.rs b/src/libstd/sys/unix/process/zircon.rs
index 690c745218b..ec715d5490f 100644
--- a/src/libstd/sys/unix/process/zircon.rs
+++ b/src/libstd/sys/unix/process/zircon.rs
@@ -1,9 +1,9 @@
 #![allow(non_camel_case_types, unused)]
 
-use convert::TryInto;
-use io;
-use os::raw::c_char;
-use u64;
+use crate::convert::TryInto;
+use crate::io;
+use crate::os::raw::c_char;
+use crate::u64;
 
 use libc::{c_int, c_void, size_t};
 
diff --git a/src/libstd/sys/unix/rand.rs b/src/libstd/sys/unix/rand.rs
index f2e17c36738..122f22b37a2 100644
--- a/src/libstd/sys/unix/rand.rs
+++ b/src/libstd/sys/unix/rand.rs
@@ -1,5 +1,5 @@
-use mem;
-use slice;
+use crate::mem;
+use crate::slice;
 
 pub fn hashmap_random_keys() -> (u64, u64) {
     let mut v = (0, 0);
@@ -17,10 +17,8 @@ pub fn hashmap_random_keys() -> (u64, u64) {
           not(target_os = "freebsd"),
           not(target_os = "fuchsia")))]
 mod imp {
-    use fs::File;
-    use io::Read;
-    #[cfg(any(target_os = "linux", target_os = "android"))]
-    use libc;
+    use crate::fs::File;
+    use crate::io::Read;
 
     #[cfg(any(target_os = "linux", target_os = "android"))]
     fn getrandom(buf: &mut [u8]) -> libc::c_long {
@@ -34,8 +32,8 @@ mod imp {
 
     #[cfg(any(target_os = "linux", target_os = "android"))]
     fn getrandom_fill_bytes(v: &mut [u8]) -> bool {
-        use sync::atomic::{AtomicBool, Ordering};
-        use sys::os::errno;
+        use crate::sync::atomic::{AtomicBool, Ordering};
+        use crate::sys::os::errno;
 
         static GETRANDOM_UNAVAILABLE: AtomicBool = AtomicBool::new(false);
         if GETRANDOM_UNAVAILABLE.load(Ordering::Relaxed) {
@@ -86,8 +84,7 @@ mod imp {
 
 #[cfg(target_os = "openbsd")]
 mod imp {
-    use libc;
-    use sys::os::errno;
+    use crate::sys::os::errno;
 
     pub fn fill_bytes(v: &mut [u8]) {
         // getentropy(2) permits a maximum buffer size of 256 bytes
@@ -104,9 +101,9 @@ mod imp {
 
 #[cfg(target_os = "ios")]
 mod imp {
-    use io;
+    use crate::io;
+    use crate::ptr;
     use libc::{c_int, size_t};
-    use ptr;
 
     enum SecRandom {}
 
@@ -134,8 +131,7 @@ mod imp {
 
 #[cfg(target_os = "freebsd")]
 mod imp {
-    use libc;
-    use ptr;
+    use crate::ptr;
 
     pub fn fill_bytes(v: &mut [u8]) {
         let mib = [libc::CTL_KERN, libc::KERN_ARND];
diff --git a/src/libstd/sys/unix/rwlock.rs b/src/libstd/sys/unix/rwlock.rs
index a068a11993e..e48bfdae610 100644
--- a/src/libstd/sys/unix/rwlock.rs
+++ b/src/libstd/sys/unix/rwlock.rs
@@ -1,6 +1,5 @@
-use libc;
-use cell::UnsafeCell;
-use sync::atomic::{AtomicUsize, Ordering};
+use crate::cell::UnsafeCell;
+use crate::sync::atomic::{AtomicUsize, Ordering};
 
 pub struct RWLock {
     inner: UnsafeCell<libc::pthread_rwlock_t>,
diff --git a/src/libstd/sys/unix/stack_overflow.rs b/src/libstd/sys/unix/stack_overflow.rs
index d6a219a6d57..cfa019634bd 100644
--- a/src/libstd/sys/unix/stack_overflow.rs
+++ b/src/libstd/sys/unix/stack_overflow.rs
@@ -1,6 +1,5 @@
 #![cfg_attr(test, allow(dead_code))]
 
-use libc;
 use self::imp::{make_handler, drop_handler};
 
 pub use self::imp::cleanup;
@@ -34,8 +33,9 @@ impl Drop for Handler {
           target_os = "openbsd"))]
 mod imp {
     use super::Handler;
-    use mem;
-    use ptr;
+    use crate::mem;
+    use crate::ptr;
+
     use libc::{sigaltstack, SIGSTKSZ, SS_DISABLE};
     use libc::{sigaction, SIGBUS, SIG_DFL,
                SA_SIGINFO, SA_ONSTACK, sighandler_t};
@@ -44,7 +44,7 @@ mod imp {
     use libc::{SIGSEGV, PROT_READ, PROT_WRITE, MAP_PRIVATE, MAP_ANON};
     use libc::MAP_FAILED;
 
-    use sys_common::thread_info;
+    use crate::sys_common::thread_info;
 
 
     #[cfg(any(target_os = "linux", target_os = "android"))]
@@ -87,7 +87,7 @@ mod imp {
     unsafe extern fn signal_handler(signum: libc::c_int,
                                     info: *mut libc::siginfo_t,
                                     _data: *mut libc::c_void) {
-        use sys_common::util::report_overflow;
+        use crate::sys_common::util::report_overflow;
 
         let guard = thread_info::stack_guard().unwrap_or(0..0);
         let addr = siginfo_si_addr(info);
@@ -193,7 +193,7 @@ mod imp {
               all(target_os = "netbsd", not(target_vendor = "rumprun")),
               target_os = "openbsd")))]
 mod imp {
-    use ptr;
+    use crate::ptr;
 
     pub unsafe fn init() {
     }
diff --git a/src/libstd/sys/unix/stdio.rs b/src/libstd/sys/unix/stdio.rs
index 56b75bf9f79..35f163bbdb1 100644
--- a/src/libstd/sys/unix/stdio.rs
+++ b/src/libstd/sys/unix/stdio.rs
@@ -1,6 +1,5 @@
-use io;
-use libc;
-use sys::fd::FileDesc;
+use crate::io;
+use crate::sys::fd::FileDesc;
 
 pub struct Stdin(());
 pub struct Stdout(());
@@ -57,7 +56,7 @@ pub fn is_ebadf(err: &io::Error) -> bool {
     err.raw_os_error() == Some(libc::EBADF as i32)
 }
 
-pub const STDIN_BUF_SIZE: usize = ::sys_common::io::DEFAULT_BUF_SIZE;
+pub const STDIN_BUF_SIZE: usize = crate::sys_common::io::DEFAULT_BUF_SIZE;
 
 pub fn panic_output() -> Option<impl io::Write> {
     Stderr::new().ok()
diff --git a/src/libstd/sys/unix/thread.rs b/src/libstd/sys/unix/thread.rs
index e29557f1ba2..feb15e8f585 100644
--- a/src/libstd/sys/unix/thread.rs
+++ b/src/libstd/sys/unix/thread.rs
@@ -1,14 +1,13 @@
-use boxed::FnBox;
-use cmp;
-use ffi::CStr;
-use io;
-use libc;
-use mem;
-use ptr;
-use sys::os;
-use time::Duration;
-
-use sys_common::thread::*;
+use crate::boxed::FnBox;
+use crate::cmp;
+use crate::ffi::CStr;
+use crate::io;
+use crate::mem;
+use crate::ptr;
+use crate::sys::os;
+use crate::time::Duration;
+
+use crate::sys_common::thread::*;
 
 #[cfg(not(target_os = "l4re"))]
 pub const DEFAULT_MIN_STACK_SIZE: usize = 2 * 1024 * 1024;
@@ -118,7 +117,7 @@ impl Thread {
 
     #[cfg(target_os = "netbsd")]
     pub fn set_name(name: &CStr) {
-        use ffi::CString;
+        use crate::ffi::CString;
         let cname = CString::new(&b"%s"[..]).unwrap();
         unsafe {
             libc::pthread_setname_np(libc::pthread_self(), cname.as_ptr(),
@@ -197,7 +196,7 @@ impl Drop for Thread {
           not(target_os = "solaris")))]
 #[cfg_attr(test, allow(dead_code))]
 pub mod guard {
-    use ops::Range;
+    use crate::ops::Range;
     pub type Guard = Range<usize>;
     pub unsafe fn current() -> Option<Guard> { None }
     pub unsafe fn init() -> Option<Guard> { None }
@@ -213,11 +212,11 @@ pub mod guard {
           target_os = "solaris"))]
 #[cfg_attr(test, allow(dead_code))]
 pub mod guard {
-    use libc;
     use libc::{mmap, mprotect};
     use libc::{PROT_NONE, PROT_READ, PROT_WRITE, MAP_PRIVATE, MAP_ANON, MAP_FAILED, MAP_FIXED};
-    use ops::Range;
-    use sys::os;
+
+    use crate::ops::Range;
+    use crate::sys::os;
 
     // This is initialized in init() and only read from after
     static mut PAGE_SIZE: usize = 0;
@@ -226,7 +225,7 @@ pub mod guard {
 
     #[cfg(target_os = "solaris")]
     unsafe fn get_stack_start() -> Option<*mut libc::c_void> {
-        let mut current_stack: libc::stack_t = ::mem::zeroed();
+        let mut current_stack: libc::stack_t = crate::mem::zeroed();
         assert_eq!(libc::stack_getbounds(&mut current_stack), 0);
         Some(current_stack.ss_sp)
     }
@@ -240,7 +239,7 @@ pub mod guard {
 
     #[cfg(any(target_os = "openbsd", target_os = "bitrig"))]
     unsafe fn get_stack_start() -> Option<*mut libc::c_void> {
-        let mut current_stack: libc::stack_t = ::mem::zeroed();
+        let mut current_stack: libc::stack_t = crate::mem::zeroed();
         assert_eq!(libc::pthread_stackseg_np(libc::pthread_self(),
                                              &mut current_stack), 0);
 
@@ -259,14 +258,14 @@ pub mod guard {
               target_os = "linux", target_os = "netbsd", target_os = "l4re"))]
     unsafe fn get_stack_start() -> Option<*mut libc::c_void> {
         let mut ret = None;
-        let mut attr: libc::pthread_attr_t = ::mem::zeroed();
+        let mut attr: libc::pthread_attr_t = crate::mem::zeroed();
         assert_eq!(libc::pthread_attr_init(&mut attr), 0);
         #[cfg(target_os = "freebsd")]
             let e = libc::pthread_attr_get_np(libc::pthread_self(), &mut attr);
         #[cfg(not(target_os = "freebsd"))]
             let e = libc::pthread_getattr_np(libc::pthread_self(), &mut attr);
         if e == 0 {
-            let mut stackaddr = ::ptr::null_mut();
+            let mut stackaddr = crate::ptr::null_mut();
             let mut stacksize = 0;
             assert_eq!(libc::pthread_attr_getstack(&attr, &mut stackaddr,
                                                    &mut stacksize), 0);
@@ -357,7 +356,7 @@ pub mod guard {
               target_os = "linux", target_os = "netbsd", target_os = "l4re"))]
     pub unsafe fn current() -> Option<Guard> {
         let mut ret = None;
-        let mut attr: libc::pthread_attr_t = ::mem::zeroed();
+        let mut attr: libc::pthread_attr_t = crate::mem::zeroed();
         assert_eq!(libc::pthread_attr_init(&mut attr), 0);
         #[cfg(target_os = "freebsd")]
             let e = libc::pthread_attr_get_np(libc::pthread_self(), &mut attr);
@@ -369,7 +368,7 @@ pub mod guard {
             if guardsize == 0 {
                 panic!("there is no guard page");
             }
-            let mut stackaddr = ::ptr::null_mut();
+            let mut stackaddr = crate::ptr::null_mut();
             let mut size = 0;
             assert_eq!(libc::pthread_attr_getstack(&attr, &mut stackaddr,
                                                    &mut size), 0);
diff --git a/src/libstd/sys/unix/thread_local.rs b/src/libstd/sys/unix/thread_local.rs
index c171fbce237..ac615b76b36 100644
--- a/src/libstd/sys/unix/thread_local.rs
+++ b/src/libstd/sys/unix/thread_local.rs
@@ -1,7 +1,6 @@
 #![allow(dead_code)] // not used on all platforms
 
-use mem;
-use libc;
+use crate::mem;
 
 pub type Key = libc::pthread_key_t;
 
diff --git a/src/libstd/sys/unix/time.rs b/src/libstd/sys/unix/time.rs
index 4a655714f99..cbb0615911a 100644
--- a/src/libstd/sys/unix/time.rs
+++ b/src/libstd/sys/unix/time.rs
@@ -1,10 +1,10 @@
-use cmp::Ordering;
-use libc;
-use time::Duration;
+use crate::cmp::Ordering;
+use crate::time::Duration;
+
 use core::hash::{Hash, Hasher};
 
 pub use self::inner::{Instant, SystemTime, UNIX_EPOCH};
-use convert::TryInto;
+use crate::convert::TryInto;
 
 const NSEC_PER_SEC: u64 = 1_000_000_000;
 
@@ -113,12 +113,11 @@ impl Hash for Timespec {
 
 #[cfg(any(target_os = "macos", target_os = "ios"))]
 mod inner {
-    use fmt;
-    use libc;
-    use sync::Once;
-    use sys::cvt;
-    use sys_common::mul_div_u64;
-    use time::Duration;
+    use crate::fmt;
+    use crate::sync::Once;
+    use crate::sys::cvt;
+    use crate::sys_common::mul_div_u64;
+    use crate::time::Duration;
 
     use super::NSEC_PER_SEC;
     use super::Timespec;
@@ -173,7 +172,7 @@ mod inner {
 
     impl SystemTime {
         pub fn now() -> SystemTime {
-            use ptr;
+            use crate::ptr;
 
             let mut s = libc::timeval {
                 tv_sec: 0,
@@ -249,10 +248,9 @@ mod inner {
 
 #[cfg(not(any(target_os = "macos", target_os = "ios")))]
 mod inner {
-    use fmt;
-    use libc;
-    use sys::cvt;
-    use time::Duration;
+    use crate::fmt;
+    use crate::sys::cvt;
+    use crate::time::Duration;
 
     use super::Timespec;
 
diff --git a/src/libstd/sys/unix/weak.rs b/src/libstd/sys/unix/weak.rs
index b60e241f10c..9a7691e54bc 100644
--- a/src/libstd/sys/unix/weak.rs
+++ b/src/libstd/sys/unix/weak.rs
@@ -16,17 +16,15 @@
 //! symbol, but that caused Debian to detect an unnecessarily strict versioned
 //! dependency on libc6 (#23628).
 
-use libc;
-
-use ffi::CStr;
-use marker;
-use mem;
-use sync::atomic::{AtomicUsize, Ordering};
+use crate::ffi::CStr;
+use crate::marker;
+use crate::mem;
+use crate::sync::atomic::{AtomicUsize, Ordering};
 
 macro_rules! weak {
     (fn $name:ident($($t:ty),*) -> $ret:ty) => (
-        static $name: ::sys::weak::Weak<unsafe extern fn($($t),*) -> $ret> =
-            ::sys::weak::Weak::new(concat!(stringify!($name), '\0'));
+        static $name: crate::sys::weak::Weak<unsafe extern fn($($t),*) -> $ret> =
+            crate::sys::weak::Weak::new(concat!(stringify!($name), '\0'));
     )
 }
 
@@ -71,7 +69,6 @@ unsafe fn fetch(name: &str) -> usize {
 macro_rules! syscall {
     (fn $name:ident($($arg_name:ident: $t:ty),*) -> $ret:ty) => (
         unsafe fn $name($($arg_name: $t),*) -> $ret {
-            use libc;
             use super::os;
 
             weak! { fn $name($($t),*) -> $ret }