mv std libs to library/

22 files changed, 0 insertions, 1553 deletions

diff --git a/src/libstd/sys/unsupported/alloc.rs b/src/libstd/sys/unsupported/alloc.rs
deleted file mode 100644
index 8d5d0a2f5cc..00000000000
--- a/src/libstd/sys/unsupported/alloc.rs
+++ /dev/null
@@ -1,22 +0,0 @@
-use crate::alloc::{GlobalAlloc, Layout, System};
-
-#[stable(feature = "alloc_system_type", since = "1.28.0")]
-unsafe impl GlobalAlloc for System {
-    #[inline]
-    unsafe fn alloc(&self, _layout: Layout) -> *mut u8 {
-        0 as *mut u8
-    }
-
-    #[inline]
-    unsafe fn alloc_zeroed(&self, _layout: Layout) -> *mut u8 {
-        0 as *mut u8
-    }
-
-    #[inline]
-    unsafe fn dealloc(&self, _ptr: *mut u8, _layout: Layout) {}
-
-    #[inline]
-    unsafe fn realloc(&self, _ptr: *mut u8, _layout: Layout, _new_size: usize) -> *mut u8 {
-        0 as *mut u8
-    }
-}
diff --git a/src/libstd/sys/unsupported/args.rs b/src/libstd/sys/unsupported/args.rs
deleted file mode 100644
index 71d0c5fa13e..00000000000
--- a/src/libstd/sys/unsupported/args.rs
+++ /dev/null
@@ -1,38 +0,0 @@
-use crate::ffi::OsString;
-
-pub unsafe fn init(_argc: isize, _argv: *const *const u8) {}
-pub unsafe fn cleanup() {}
-
-pub struct Args {}
-
-pub fn args() -> Args {
-    Args {}
-}
-
-impl Args {
-    pub fn inner_debug(&self) -> &[OsString] {
-        &[]
-    }
-}
-
-impl Iterator for Args {
-    type Item = OsString;
-    fn next(&mut self) -> Option<OsString> {
-        None
-    }
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        (0, Some(0))
-    }
-}
-
-impl ExactSizeIterator for Args {
-    fn len(&self) -> usize {
-        0
-    }
-}
-
-impl DoubleEndedIterator for Args {
-    fn next_back(&mut self) -> Option<OsString> {
-        None
-    }
-}
diff --git a/src/libstd/sys/unsupported/cmath.rs b/src/libstd/sys/unsupported/cmath.rs
deleted file mode 100644
index 304cf906b2a..00000000000
--- a/src/libstd/sys/unsupported/cmath.rs
+++ /dev/null
@@ -1,29 +0,0 @@
-// These symbols are all defined in `compiler-builtins`
-extern "C" {
-    pub fn acos(n: f64) -> f64;
-    pub fn acosf(n: f32) -> f32;
-    pub fn asin(n: f64) -> f64;
-    pub fn asinf(n: f32) -> f32;
-    pub fn atan(n: f64) -> f64;
-    pub fn atan2(a: f64, b: f64) -> f64;
-    pub fn atan2f(a: f32, b: f32) -> f32;
-    pub fn atanf(n: f32) -> f32;
-    pub fn cbrt(n: f64) -> f64;
-    pub fn cbrtf(n: f32) -> f32;
-    pub fn cosh(n: f64) -> f64;
-    pub fn coshf(n: f32) -> f32;
-    pub fn expm1(n: f64) -> f64;
-    pub fn expm1f(n: f32) -> f32;
-    pub fn fdim(a: f64, b: f64) -> f64;
-    pub fn fdimf(a: f32, b: f32) -> f32;
-    pub fn hypot(x: f64, y: f64) -> f64;
-    pub fn hypotf(x: f32, y: f32) -> f32;
-    pub fn log1p(n: f64) -> f64;
-    pub fn log1pf(n: f32) -> f32;
-    pub fn sinh(n: f64) -> f64;
-    pub fn sinhf(n: f32) -> f32;
-    pub fn tan(n: f64) -> f64;
-    pub fn tanf(n: f32) -> f32;
-    pub fn tanh(n: f64) -> f64;
-    pub fn tanhf(n: f32) -> f32;
-}
diff --git a/src/libstd/sys/unsupported/common.rs b/src/libstd/sys/unsupported/common.rs
deleted file mode 100644
index 80311d26819..00000000000
--- a/src/libstd/sys/unsupported/common.rs
+++ /dev/null
@@ -1,48 +0,0 @@
-use crate::io as std_io;
-
-pub mod memchr {
-    pub use core::slice::memchr::{memchr, memrchr};
-}
-
-pub use crate::sys_common::os_str_bytes as os_str;
-
-// This is not necessarily correct. May want to consider making it part of the
-// spec definition?
-use crate::os::raw::c_char;
-
-#[cfg(not(test))]
-pub fn init() {}
-
-pub fn unsupported<T>() -> std_io::Result<T> {
-    Err(unsupported_err())
-}
-
-pub fn unsupported_err() -> std_io::Error {
-    std_io::Error::new(std_io::ErrorKind::Other, "operation not supported on this platform")
-}
-
-pub fn decode_error_kind(_code: i32) -> crate::io::ErrorKind {
-    crate::io::ErrorKind::Other
-}
-
-pub fn abort_internal() -> ! {
-    core::intrinsics::abort();
-}
-
-pub fn hashmap_random_keys() -> (u64, u64) {
-    (1, 2)
-}
-
-// This enum is used as the storage for a bunch of types which can't actually
-// exist.
-#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
-pub enum Void {}
-
-pub unsafe fn strlen(mut s: *const c_char) -> usize {
-    let mut n = 0;
-    while *s != 0 {
-        n += 1;
-        s = s.offset(1);
-    }
-    return n;
-}
diff --git a/src/libstd/sys/unsupported/condvar.rs b/src/libstd/sys/unsupported/condvar.rs
deleted file mode 100644
index a578eee8ccc..00000000000
--- a/src/libstd/sys/unsupported/condvar.rs
+++ /dev/null
@@ -1,30 +0,0 @@
-use crate::sys::mutex::Mutex;
-use crate::time::Duration;
-
-pub struct Condvar {}
-
-impl Condvar {
-    pub const fn new() -> Condvar {
-        Condvar {}
-    }
-
-    #[inline]
-    pub unsafe fn init(&mut self) {}
-
-    #[inline]
-    pub unsafe fn notify_one(&self) {}
-
-    #[inline]
-    pub unsafe fn notify_all(&self) {}
-
-    pub unsafe fn wait(&self, _mutex: &Mutex) {
-        panic!("condvar wait not supported")
-    }
-
-    pub unsafe fn wait_timeout(&self, _mutex: &Mutex, _dur: Duration) -> bool {
-        panic!("condvar wait not supported");
-    }
-
-    #[inline]
-    pub unsafe fn destroy(&self) {}
-}
diff --git a/src/libstd/sys/unsupported/env.rs b/src/libstd/sys/unsupported/env.rs
deleted file mode 100644
index d2efec506c5..00000000000
--- a/src/libstd/sys/unsupported/env.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-pub mod os {
-    pub const FAMILY: &str = "";
-    pub const OS: &str = "";
-    pub const DLL_PREFIX: &str = "";
-    pub const DLL_SUFFIX: &str = "";
-    pub const DLL_EXTENSION: &str = "";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
diff --git a/src/libstd/sys/unsupported/fs.rs b/src/libstd/sys/unsupported/fs.rs
deleted file mode 100644
index ecb5b51cccd..00000000000
--- a/src/libstd/sys/unsupported/fs.rs
+++ /dev/null
@@ -1,308 +0,0 @@
-use crate::ffi::OsString;
-use crate::fmt;
-use crate::hash::{Hash, Hasher};
-use crate::io::{self, IoSlice, IoSliceMut, SeekFrom};
-use crate::path::{Path, PathBuf};
-use crate::sys::time::SystemTime;
-use crate::sys::{unsupported, Void};
-
-pub struct File(Void);
-
-pub struct FileAttr(Void);
-
-pub struct ReadDir(Void);
-
-pub struct DirEntry(Void);
-
-#[derive(Clone, Debug)]
-pub struct OpenOptions {}
-
-pub struct FilePermissions(Void);
-
-pub struct FileType(Void);
-
-#[derive(Debug)]
-pub struct DirBuilder {}
-
-impl FileAttr {
-    pub fn size(&self) -> u64 {
-        match self.0 {}
-    }
-
-    pub fn perm(&self) -> FilePermissions {
-        match self.0 {}
-    }
-
-    pub fn file_type(&self) -> FileType {
-        match self.0 {}
-    }
-
-    pub fn modified(&self) -> io::Result<SystemTime> {
-        match self.0 {}
-    }
-
-    pub fn accessed(&self) -> io::Result<SystemTime> {
-        match self.0 {}
-    }
-
-    pub fn created(&self) -> io::Result<SystemTime> {
-        match self.0 {}
-    }
-}
-
-impl Clone for FileAttr {
-    fn clone(&self) -> FileAttr {
-        match self.0 {}
-    }
-}
-
-impl FilePermissions {
-    pub fn readonly(&self) -> bool {
-        match self.0 {}
-    }
-
-    pub fn set_readonly(&mut self, _readonly: bool) {
-        match self.0 {}
-    }
-}
-
-impl Clone for FilePermissions {
-    fn clone(&self) -> FilePermissions {
-        match self.0 {}
-    }
-}
-
-impl PartialEq for FilePermissions {
-    fn eq(&self, _other: &FilePermissions) -> bool {
-        match self.0 {}
-    }
-}
-
-impl Eq for FilePermissions {}
-
-impl fmt::Debug for FilePermissions {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.0 {}
-    }
-}
-
-impl FileType {
-    pub fn is_dir(&self) -> bool {
-        match self.0 {}
-    }
-
-    pub fn is_file(&self) -> bool {
-        match self.0 {}
-    }
-
-    pub fn is_symlink(&self) -> bool {
-        match self.0 {}
-    }
-}
-
-impl Clone for FileType {
-    fn clone(&self) -> FileType {
-        match self.0 {}
-    }
-}
-
-impl Copy for FileType {}
-
-impl PartialEq for FileType {
-    fn eq(&self, _other: &FileType) -> bool {
-        match self.0 {}
-    }
-}
-
-impl Eq for FileType {}
-
-impl Hash for FileType {
-    fn hash<H: Hasher>(&self, _h: &mut H) {
-        match self.0 {}
-    }
-}
-
-impl fmt::Debug for FileType {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.0 {}
-    }
-}
-
-impl fmt::Debug for ReadDir {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.0 {}
-    }
-}
-
-impl Iterator for ReadDir {
-    type Item = io::Result<DirEntry>;
-
-    fn next(&mut self) -> Option<io::Result<DirEntry>> {
-        match self.0 {}
-    }
-}
-
-impl DirEntry {
-    pub fn path(&self) -> PathBuf {
-        match self.0 {}
-    }
-
-    pub fn file_name(&self) -> OsString {
-        match self.0 {}
-    }
-
-    pub fn metadata(&self) -> io::Result<FileAttr> {
-        match self.0 {}
-    }
-
-    pub fn file_type(&self) -> io::Result<FileType> {
-        match self.0 {}
-    }
-}
-
-impl OpenOptions {
-    pub fn new() -> OpenOptions {
-        OpenOptions {}
-    }
-
-    pub fn read(&mut self, _read: bool) {}
-    pub fn write(&mut self, _write: bool) {}
-    pub fn append(&mut self, _append: bool) {}
-    pub fn truncate(&mut self, _truncate: bool) {}
-    pub fn create(&mut self, _create: bool) {}
-    pub fn create_new(&mut self, _create_new: bool) {}
-}
-
-impl File {
-    pub fn open(_path: &Path, _opts: &OpenOptions) -> io::Result<File> {
-        unsupported()
-    }
-
-    pub fn file_attr(&self) -> io::Result<FileAttr> {
-        match self.0 {}
-    }
-
-    pub fn fsync(&self) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn datasync(&self) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn truncate(&self, _size: u64) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn read(&self, _buf: &mut [u8]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn read_vectored(&self, _bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn is_read_vectored(&self) -> bool {
-        match self.0 {}
-    }
-
-    pub fn write(&self, _buf: &[u8]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn write_vectored(&self, _bufs: &[IoSlice<'_>]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn is_write_vectored(&self) -> bool {
-        match self.0 {}
-    }
-
-    pub fn flush(&self) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn seek(&self, _pos: SeekFrom) -> io::Result<u64> {
-        match self.0 {}
-    }
-
-    pub fn duplicate(&self) -> io::Result<File> {
-        match self.0 {}
-    }
-
-    pub fn set_permissions(&self, _perm: FilePermissions) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn diverge(&self) -> ! {
-        match self.0 {}
-    }
-}
-
-impl DirBuilder {
-    pub fn new() -> DirBuilder {
-        DirBuilder {}
-    }
-
-    pub fn mkdir(&self, _p: &Path) -> io::Result<()> {
-        unsupported()
-    }
-}
-
-impl fmt::Debug for File {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.0 {}
-    }
-}
-
-pub fn readdir(_p: &Path) -> io::Result<ReadDir> {
-    unsupported()
-}
-
-pub fn unlink(_p: &Path) -> io::Result<()> {
-    unsupported()
-}
-
-pub fn rename(_old: &Path, _new: &Path) -> io::Result<()> {
-    unsupported()
-}
-
-pub fn set_perm(_p: &Path, perm: FilePermissions) -> io::Result<()> {
-    match perm.0 {}
-}
-
-pub fn rmdir(_p: &Path) -> io::Result<()> {
-    unsupported()
-}
-
-pub fn remove_dir_all(_path: &Path) -> io::Result<()> {
-    unsupported()
-}
-
-pub fn readlink(_p: &Path) -> io::Result<PathBuf> {
-    unsupported()
-}
-
-pub fn symlink(_src: &Path, _dst: &Path) -> io::Result<()> {
-    unsupported()
-}
-
-pub fn link(_src: &Path, _dst: &Path) -> io::Result<()> {
-    unsupported()
-}
-
-pub fn stat(_p: &Path) -> io::Result<FileAttr> {
-    unsupported()
-}
-
-pub fn lstat(_p: &Path) -> io::Result<FileAttr> {
-    unsupported()
-}
-
-pub fn canonicalize(_p: &Path) -> io::Result<PathBuf> {
-    unsupported()
-}
-
-pub fn copy(_from: &Path, _to: &Path) -> io::Result<u64> {
-    unsupported()
-}
diff --git a/src/libstd/sys/unsupported/io.rs b/src/libstd/sys/unsupported/io.rs
deleted file mode 100644
index d5f475b4310..00000000000
--- a/src/libstd/sys/unsupported/io.rs
+++ /dev/null
@@ -1,47 +0,0 @@
-use crate::mem;
-
-#[derive(Copy, Clone)]
-pub struct IoSlice<'a>(&'a [u8]);
-
-impl<'a> IoSlice<'a> {
-    #[inline]
-    pub fn new(buf: &'a [u8]) -> IoSlice<'a> {
-        IoSlice(buf)
-    }
-
-    #[inline]
-    pub fn advance(&mut self, n: usize) {
-        self.0 = &self.0[n..]
-    }
-
-    #[inline]
-    pub fn as_slice(&self) -> &[u8] {
-        self.0
-    }
-}
-
-pub struct IoSliceMut<'a>(&'a mut [u8]);
-
-impl<'a> IoSliceMut<'a> {
-    #[inline]
-    pub fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> {
-        IoSliceMut(buf)
-    }
-
-    #[inline]
-    pub fn advance(&mut self, n: usize) {
-        let slice = mem::replace(&mut self.0, &mut []);
-        let (_, remaining) = slice.split_at_mut(n);
-        self.0 = remaining;
-    }
-
-    #[inline]
-    pub fn as_slice(&self) -> &[u8] {
-        self.0
-    }
-
-    #[inline]
-    pub fn as_mut_slice(&mut self) -> &mut [u8] {
-        self.0
-    }
-}
diff --git a/src/libstd/sys/unsupported/mod.rs b/src/libstd/sys/unsupported/mod.rs
deleted file mode 100644
index 87f655eecd5..00000000000
--- a/src/libstd/sys/unsupported/mod.rs
+++ /dev/null
@@ -1,24 +0,0 @@
-pub mod alloc;
-pub mod args;
-pub mod cmath;
-pub mod condvar;
-pub mod env;
-pub mod fs;
-pub mod io;
-pub mod mutex;
-pub mod net;
-pub mod os;
-pub mod path;
-pub mod pipe;
-pub mod process;
-pub mod rwlock;
-pub mod stack_overflow;
-pub mod stdio;
-pub mod thread;
-#[cfg(target_thread_local)]
-pub mod thread_local_dtor;
-pub mod thread_local_key;
-pub mod time;
-
-mod common;
-pub use common::*;
diff --git a/src/libstd/sys/unsupported/mutex.rs b/src/libstd/sys/unsupported/mutex.rs
deleted file mode 100644
index 9ef8af52eb5..00000000000
--- a/src/libstd/sys/unsupported/mutex.rs
+++ /dev/null
@@ -1,67 +0,0 @@
-use crate::cell::UnsafeCell;
-
-pub struct Mutex {
-    locked: UnsafeCell<bool>,
-}
-
-unsafe impl Send for Mutex {}
-unsafe impl Sync for Mutex {} // no threads on this platform
-
-impl Mutex {
-    #[rustc_const_stable(feature = "const_sys_mutex_new", since = "1.0.0")]
-    pub const fn new() -> Mutex {
-        Mutex { locked: UnsafeCell::new(false) }
-    }
-
-    #[inline]
-    pub unsafe fn init(&mut self) {}
-
-    #[inline]
-    pub unsafe fn lock(&self) {
-        let locked = self.locked.get();
-        assert!(!*locked, "cannot recursively acquire mutex");
-        *locked = true;
-    }
-
-    #[inline]
-    pub unsafe fn unlock(&self) {
-        *self.locked.get() = false;
-    }
-
-    #[inline]
-    pub unsafe fn try_lock(&self) -> bool {
-        let locked = self.locked.get();
-        if *locked {
-            false
-        } else {
-            *locked = true;
-            true
-        }
-    }
-
-    #[inline]
-    pub unsafe fn destroy(&self) {}
-}
-
-// All empty stubs because this platform does not yet support threads, so lock
-// acquisition always succeeds.
-pub struct ReentrantMutex {}
-
-impl ReentrantMutex {
-    pub const unsafe fn uninitialized() -> ReentrantMutex {
-        ReentrantMutex {}
-    }
-
-    pub unsafe fn init(&self) {}
-
-    pub unsafe fn lock(&self) {}
-
-    #[inline]
-    pub unsafe fn try_lock(&self) -> bool {
-        true
-    }
-
-    pub unsafe fn unlock(&self) {}
-
-    pub unsafe fn destroy(&self) {}
-}
diff --git a/src/libstd/sys/unsupported/net.rs b/src/libstd/sys/unsupported/net.rs
deleted file mode 100644
index 5c9f1098f9b..00000000000
--- a/src/libstd/sys/unsupported/net.rs
+++ /dev/null
@@ -1,361 +0,0 @@
-use crate::convert::TryFrom;
-use crate::fmt;
-use crate::io::{self, IoSlice, IoSliceMut};
-use crate::net::{Ipv4Addr, Ipv6Addr, Shutdown, SocketAddr};
-use crate::sys::{unsupported, Void};
-use crate::time::Duration;
-
-pub struct TcpStream(Void);
-
-impl TcpStream {
-    pub fn connect(_: io::Result<&SocketAddr>) -> io::Result<TcpStream> {
-        unsupported()
-    }
-
-    pub fn connect_timeout(_: &SocketAddr, _: Duration) -> io::Result<TcpStream> {
-        unsupported()
-    }
-
-    pub fn set_read_timeout(&self, _: Option<Duration>) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn set_write_timeout(&self, _: Option<Duration>) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn read_timeout(&self) -> io::Result<Option<Duration>> {
-        match self.0 {}
-    }
-
-    pub fn write_timeout(&self) -> io::Result<Option<Duration>> {
-        match self.0 {}
-    }
-
-    pub fn peek(&self, _: &mut [u8]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn read(&self, _: &mut [u8]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn read_vectored(&self, _: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn is_read_vectored(&self) -> bool {
-        match self.0 {}
-    }
-
-    pub fn write(&self, _: &[u8]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn write_vectored(&self, _: &[IoSlice<'_>]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn is_write_vectored(&self) -> bool {
-        match self.0 {}
-    }
-
-    pub fn peer_addr(&self) -> io::Result<SocketAddr> {
-        match self.0 {}
-    }
-
-    pub fn socket_addr(&self) -> io::Result<SocketAddr> {
-        match self.0 {}
-    }
-
-    pub fn shutdown(&self, _: Shutdown) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn duplicate(&self) -> io::Result<TcpStream> {
-        match self.0 {}
-    }
-
-    pub fn set_nodelay(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn nodelay(&self) -> io::Result<bool> {
-        match self.0 {}
-    }
-
-    pub fn set_ttl(&self, _: u32) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn ttl(&self) -> io::Result<u32> {
-        match self.0 {}
-    }
-
-    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
-        match self.0 {}
-    }
-
-    pub fn set_nonblocking(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
-    }
-}
-
-impl fmt::Debug for TcpStream {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.0 {}
-    }
-}
-
-pub struct TcpListener(Void);
-
-impl TcpListener {
-    pub fn bind(_: io::Result<&SocketAddr>) -> io::Result<TcpListener> {
-        unsupported()
-    }
-
-    pub fn socket_addr(&self) -> io::Result<SocketAddr> {
-        match self.0 {}
-    }
-
-    pub fn accept(&self) -> io::Result<(TcpStream, SocketAddr)> {
-        match self.0 {}
-    }
-
-    pub fn duplicate(&self) -> io::Result<TcpListener> {
-        match self.0 {}
-    }
-
-    pub fn set_ttl(&self, _: u32) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn ttl(&self) -> io::Result<u32> {
-        match self.0 {}
-    }
-
-    pub fn set_only_v6(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn only_v6(&self) -> io::Result<bool> {
-        match self.0 {}
-    }
-
-    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
-        match self.0 {}
-    }
-
-    pub fn set_nonblocking(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
-    }
-}
-
-impl fmt::Debug for TcpListener {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.0 {}
-    }
-}
-
-pub struct UdpSocket(Void);
-
-impl UdpSocket {
-    pub fn bind(_: io::Result<&SocketAddr>) -> io::Result<UdpSocket> {
-        unsupported()
-    }
-
-    pub fn peer_addr(&self) -> io::Result<SocketAddr> {
-        match self.0 {}
-    }
-
-    pub fn socket_addr(&self) -> io::Result<SocketAddr> {
-        match self.0 {}
-    }
-
-    pub fn recv_from(&self, _: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
-        match self.0 {}
-    }
-
-    pub fn peek_from(&self, _: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
-        match self.0 {}
-    }
-
-    pub fn send_to(&self, _: &[u8], _: &SocketAddr) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn duplicate(&self) -> io::Result<UdpSocket> {
-        match self.0 {}
-    }
-
-    pub fn set_read_timeout(&self, _: Option<Duration>) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn set_write_timeout(&self, _: Option<Duration>) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn read_timeout(&self) -> io::Result<Option<Duration>> {
-        match self.0 {}
-    }
-
-    pub fn write_timeout(&self) -> io::Result<Option<Duration>> {
-        match self.0 {}
-    }
-
-    pub fn set_broadcast(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn broadcast(&self) -> io::Result<bool> {
-        match self.0 {}
-    }
-
-    pub fn set_multicast_loop_v4(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn multicast_loop_v4(&self) -> io::Result<bool> {
-        match self.0 {}
-    }
-
-    pub fn set_multicast_ttl_v4(&self, _: u32) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn multicast_ttl_v4(&self) -> io::Result<u32> {
-        match self.0 {}
-    }
-
-    pub fn set_multicast_loop_v6(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn multicast_loop_v6(&self) -> io::Result<bool> {
-        match self.0 {}
-    }
-
-    pub fn join_multicast_v4(&self, _: &Ipv4Addr, _: &Ipv4Addr) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn join_multicast_v6(&self, _: &Ipv6Addr, _: u32) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn leave_multicast_v4(&self, _: &Ipv4Addr, _: &Ipv4Addr) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn leave_multicast_v6(&self, _: &Ipv6Addr, _: u32) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn set_ttl(&self, _: u32) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn ttl(&self) -> io::Result<u32> {
-        match self.0 {}
-    }
-
-    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
-        match self.0 {}
-    }
-
-    pub fn set_nonblocking(&self, _: bool) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn recv(&self, _: &mut [u8]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn peek(&self, _: &mut [u8]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn send(&self, _: &[u8]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn connect(&self, _: io::Result<&SocketAddr>) -> io::Result<()> {
-        match self.0 {}
-    }
-}
-
-impl fmt::Debug for UdpSocket {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.0 {}
-    }
-}
-
-pub struct LookupHost(Void);
-
-impl LookupHost {
-    pub fn port(&self) -> u16 {
-        match self.0 {}
-    }
-}
-
-impl Iterator for LookupHost {
-    type Item = SocketAddr;
-    fn next(&mut self) -> Option<SocketAddr> {
-        match self.0 {}
-    }
-}
-
-impl TryFrom<&str> for LookupHost {
-    type Error = io::Error;
-
-    fn try_from(_v: &str) -> io::Result<LookupHost> {
-        unsupported()
-    }
-}
-
-impl<'a> TryFrom<(&'a str, u16)> for LookupHost {
-    type Error = io::Error;
-
-    fn try_from(_v: (&'a str, u16)) -> io::Result<LookupHost> {
-        unsupported()
-    }
-}
-
-#[allow(nonstandard_style)]
-pub mod netc {
-    pub const AF_INET: u8 = 0;
-    pub const AF_INET6: u8 = 1;
-    pub type sa_family_t = u8;
-
-    #[derive(Copy, Clone)]
-    pub struct in_addr {
-        pub s_addr: u32,
-    }
-
-    #[derive(Copy, Clone)]
-    pub struct sockaddr_in {
-        pub sin_family: sa_family_t,
-        pub sin_port: u16,
-        pub sin_addr: in_addr,
-    }
-
-    #[derive(Copy, Clone)]
-    pub struct in6_addr {
-        pub s6_addr: [u8; 16],
-    }
-
-    #[derive(Copy, Clone)]
-    pub struct sockaddr_in6 {
-        pub sin6_family: sa_family_t,
-        pub sin6_port: u16,
-        pub sin6_addr: in6_addr,
-        pub sin6_flowinfo: u32,
-        pub sin6_scope_id: u32,
-    }
-
-    #[derive(Copy, Clone)]
-    pub struct sockaddr {}
-
-    pub type socklen_t = usize;
-}
diff --git a/src/libstd/sys/unsupported/os.rs b/src/libstd/sys/unsupported/os.rs
deleted file mode 100644
index 0615780c242..00000000000
--- a/src/libstd/sys/unsupported/os.rs
+++ /dev/null
@@ -1,104 +0,0 @@
-use super::{unsupported, Void};
-use crate::error::Error as StdError;
-use crate::ffi::{OsStr, OsString};
-use crate::fmt;
-use crate::io;
-use crate::path::{self, PathBuf};
-
-pub fn errno() -> i32 {
-    0
-}
-
-pub fn error_string(_errno: i32) -> String {
-    "operation successful".to_string()
-}
-
-pub fn getcwd() -> io::Result<PathBuf> {
-    unsupported()
-}
-
-pub fn chdir(_: &path::Path) -> io::Result<()> {
-    unsupported()
-}
-
-pub struct SplitPaths<'a>(&'a Void);
-
-pub fn split_paths(_unparsed: &OsStr) -> SplitPaths<'_> {
-    panic!("unsupported")
-}
-
-impl<'a> Iterator for SplitPaths<'a> {
-    type Item = PathBuf;
-    fn next(&mut self) -> Option<PathBuf> {
-        match *self.0 {}
-    }
-}
-
-#[derive(Debug)]
-pub struct JoinPathsError;
-
-pub fn join_paths<I, T>(_paths: I) -> Result<OsString, JoinPathsError>
-where
-    I: Iterator<Item = T>,
-    T: AsRef<OsStr>,
-{
-    Err(JoinPathsError)
-}
-
-impl fmt::Display for JoinPathsError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        "not supported on this platform yet".fmt(f)
-    }
-}
-
-impl StdError for JoinPathsError {
-    #[allow(deprecated)]
-    fn description(&self) -> &str {
-        "not supported on this platform yet"
-    }
-}
-
-pub fn current_exe() -> io::Result<PathBuf> {
-    unsupported()
-}
-
-pub struct Env(Void);
-
-impl Iterator for Env {
-    type Item = (OsString, OsString);
-    fn next(&mut self) -> Option<(OsString, OsString)> {
-        match self.0 {}
-    }
-}
-
-pub fn env() -> Env {
-    panic!("not supported on this platform")
-}
-
-pub fn getenv(_: &OsStr) -> io::Result<Option<OsString>> {
-    Ok(None)
-}
-
-pub fn setenv(_: &OsStr, _: &OsStr) -> io::Result<()> {
-    Err(io::Error::new(io::ErrorKind::Other, "cannot set env vars on this platform"))
-}
-
-pub fn unsetenv(_: &OsStr) -> io::Result<()> {
-    Err(io::Error::new(io::ErrorKind::Other, "cannot unset env vars on this platform"))
-}
-
-pub fn temp_dir() -> PathBuf {
-    panic!("no filesystem on this platform")
-}
-
-pub fn home_dir() -> Option<PathBuf> {
-    None
-}
-
-pub fn exit(_code: i32) -> ! {
-    crate::intrinsics::abort()
-}
-
-pub fn getpid() -> u32 {
-    panic!("no pids on this platform")
-}
diff --git a/src/libstd/sys/unsupported/path.rs b/src/libstd/sys/unsupported/path.rs
deleted file mode 100644
index 840a7ae0426..00000000000
--- a/src/libstd/sys/unsupported/path.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-use crate::ffi::OsStr;
-use crate::path::Prefix;
-
-#[inline]
-pub fn is_sep_byte(b: u8) -> bool {
-    b == b'/'
-}
-
-#[inline]
-pub fn is_verbatim_sep(b: u8) -> bool {
-    b == b'/'
-}
-
-pub fn parse_prefix(_: &OsStr) -> Option<Prefix<'_>> {
-    None
-}
-
-pub const MAIN_SEP_STR: &str = "/";
-pub const MAIN_SEP: char = '/';
diff --git a/src/libstd/sys/unsupported/pipe.rs b/src/libstd/sys/unsupported/pipe.rs
deleted file mode 100644
index 10d0925823e..00000000000
--- a/src/libstd/sys/unsupported/pipe.rs
+++ /dev/null
@@ -1,38 +0,0 @@
-use crate::io::{self, IoSlice, IoSliceMut};
-use crate::sys::Void;
-
-pub struct AnonPipe(Void);
-
-impl AnonPipe {
-    pub fn read(&self, _buf: &mut [u8]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn read_vectored(&self, _bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn is_read_vectored(&self) -> bool {
-        match self.0 {}
-    }
-
-    pub fn write(&self, _buf: &[u8]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn write_vectored(&self, _bufs: &[IoSlice<'_>]) -> io::Result<usize> {
-        match self.0 {}
-    }
-
-    pub fn is_write_vectored(&self) -> bool {
-        match self.0 {}
-    }
-
-    pub fn diverge(&self) -> ! {
-        match self.0 {}
-    }
-}
-
-pub fn read2(p1: AnonPipe, _v1: &mut Vec<u8>, _p2: AnonPipe, _v2: &mut Vec<u8>) -> io::Result<()> {
-    match p1.0 {}
-}
diff --git a/src/libstd/sys/unsupported/process.rs b/src/libstd/sys/unsupported/process.rs
deleted file mode 100644
index 4702e5c5492..00000000000
--- a/src/libstd/sys/unsupported/process.rs
+++ /dev/null
@@ -1,149 +0,0 @@
-use crate::ffi::OsStr;
-use crate::fmt;
-use crate::io;
-use crate::sys::fs::File;
-use crate::sys::pipe::AnonPipe;
-use crate::sys::{unsupported, Void};
-use crate::sys_common::process::CommandEnv;
-
-pub use crate::ffi::OsString as EnvKey;
-
-////////////////////////////////////////////////////////////////////////////////
-// Command
-////////////////////////////////////////////////////////////////////////////////
-
-pub struct Command {
-    env: CommandEnv,
-}
-
-// passed back to std::process with the pipes connected to the child, if any
-// were requested
-pub struct StdioPipes {
-    pub stdin: Option<AnonPipe>,
-    pub stdout: Option<AnonPipe>,
-    pub stderr: Option<AnonPipe>,
-}
-
-pub enum Stdio {
-    Inherit,
-    Null,
-    MakePipe,
-}
-
-impl Command {
-    pub fn new(_program: &OsStr) -> Command {
-        Command { env: Default::default() }
-    }
-
-    pub fn arg(&mut self, _arg: &OsStr) {}
-
-    pub fn env_mut(&mut self) -> &mut CommandEnv {
-        &mut self.env
-    }
-
-    pub fn cwd(&mut self, _dir: &OsStr) {}
-
-    pub fn stdin(&mut self, _stdin: Stdio) {}
-
-    pub fn stdout(&mut self, _stdout: Stdio) {}
-
-    pub fn stderr(&mut self, _stderr: Stdio) {}
-
-    pub fn spawn(
-        &mut self,
-        _default: Stdio,
-        _needs_stdin: bool,
-    ) -> io::Result<(Process, StdioPipes)> {
-        unsupported()
-    }
-}
-
-impl From<AnonPipe> for Stdio {
-    fn from(pipe: AnonPipe) -> Stdio {
-        pipe.diverge()
-    }
-}
-
-impl From<File> for Stdio {
-    fn from(file: File) -> Stdio {
-        file.diverge()
-    }
-}
-
-impl fmt::Debug for Command {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        Ok(())
-    }
-}
-
-pub struct ExitStatus(Void);
-
-impl ExitStatus {
-    pub fn success(&self) -> bool {
-        match self.0 {}
-    }
-
-    pub fn code(&self) -> Option<i32> {
-        match self.0 {}
-    }
-}
-
-impl Clone for ExitStatus {
-    fn clone(&self) -> ExitStatus {
-        match self.0 {}
-    }
-}
-
-impl Copy for ExitStatus {}
-
-impl PartialEq for ExitStatus {
-    fn eq(&self, _other: &ExitStatus) -> bool {
-        match self.0 {}
-    }
-}
-
-impl Eq for ExitStatus {}
-
-impl fmt::Debug for ExitStatus {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.0 {}
-    }
-}
-
-impl fmt::Display for ExitStatus {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.0 {}
-    }
-}
-
-#[derive(PartialEq, Eq, Clone, Copy, Debug)]
-pub struct ExitCode(bool);
-
-impl ExitCode {
-    pub const SUCCESS: ExitCode = ExitCode(false);
-    pub const FAILURE: ExitCode = ExitCode(true);
-
-    pub fn as_i32(&self) -> i32 {
-        self.0 as i32
-    }
-}
-
-pub struct Process(Void);
-
-impl Process {
-    pub fn id(&self) -> u32 {
-        match self.0 {}
-    }
-
-    pub fn kill(&mut self) -> io::Result<()> {
-        match self.0 {}
-    }
-
-    pub fn wait(&mut self) -> io::Result<ExitStatus> {
-        match self.0 {}
-    }
-
-    pub fn try_wait(&mut self) -> io::Result<Option<ExitStatus>> {
-        match self.0 {}
-    }
-}
diff --git a/src/libstd/sys/unsupported/rwlock.rs b/src/libstd/sys/unsupported/rwlock.rs
deleted file mode 100644
index d37f34ac935..00000000000
--- a/src/libstd/sys/unsupported/rwlock.rs
+++ /dev/null
@@ -1,69 +0,0 @@
-use crate::cell::UnsafeCell;
-
-pub struct RWLock {
-    mode: UnsafeCell<isize>,
-}
-
-unsafe impl Send for RWLock {}
-unsafe impl Sync for RWLock {} // no threads on this platform
-
-impl RWLock {
-    pub const fn new() -> RWLock {
-        RWLock { mode: UnsafeCell::new(0) }
-    }
-
-    #[inline]
-    pub unsafe fn read(&self) {
-        let mode = self.mode.get();
-        if *mode >= 0 {
-            *mode += 1;
-        } else {
-            rtabort!("rwlock locked for writing");
-        }
-    }
-
-    #[inline]
-    pub unsafe fn try_read(&self) -> bool {
-        let mode = self.mode.get();
-        if *mode >= 0 {
-            *mode += 1;
-            true
-        } else {
-            false
-        }
-    }
-
-    #[inline]
-    pub unsafe fn write(&self) {
-        let mode = self.mode.get();
-        if *mode == 0 {
-            *mode = -1;
-        } else {
-            rtabort!("rwlock locked for reading")
-        }
-    }
-
-    #[inline]
-    pub unsafe fn try_write(&self) -> bool {
-        let mode = self.mode.get();
-        if *mode == 0 {
-            *mode = -1;
-            true
-        } else {
-            false
-        }
-    }
-
-    #[inline]
-    pub unsafe fn read_unlock(&self) {
-        *self.mode.get() -= 1;
-    }
-
-    #[inline]
-    pub unsafe fn write_unlock(&self) {
-        *self.mode.get() += 1;
-    }
-
-    #[inline]
-    pub unsafe fn destroy(&self) {}
-}
diff --git a/src/libstd/sys/unsupported/stack_overflow.rs b/src/libstd/sys/unsupported/stack_overflow.rs
deleted file mode 100644
index 32555394cd5..00000000000
--- a/src/libstd/sys/unsupported/stack_overflow.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-pub unsafe fn init() {}
-
-pub unsafe fn cleanup() {}
diff --git a/src/libstd/sys/unsupported/stdio.rs b/src/libstd/sys/unsupported/stdio.rs
deleted file mode 100644
index 5a4e4505e93..00000000000
--- a/src/libstd/sys/unsupported/stdio.rs
+++ /dev/null
@@ -1,59 +0,0 @@
-use crate::io;
-
-pub struct Stdin;
-pub struct Stdout;
-pub struct Stderr;
-
-impl Stdin {
-    pub fn new() -> io::Result<Stdin> {
-        Ok(Stdin)
-    }
-}
-
-impl io::Read for Stdin {
-    fn read(&mut self, _buf: &mut [u8]) -> io::Result<usize> {
-        Ok(0)
-    }
-}
-
-impl Stdout {
-    pub fn new() -> io::Result<Stdout> {
-        Ok(Stdout)
-    }
-}
-
-impl io::Write for Stdout {
-    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        Ok(buf.len())
-    }
-
-    fn flush(&mut self) -> io::Result<()> {
-        Ok(())
-    }
-}
-
-impl Stderr {
-    pub fn new() -> io::Result<Stderr> {
-        Ok(Stderr)
-    }
-}
-
-impl io::Write for Stderr {
-    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        Ok(buf.len())
-    }
-
-    fn flush(&mut self) -> io::Result<()> {
-        Ok(())
-    }
-}
-
-pub const STDIN_BUF_SIZE: usize = 0;
-
-pub fn is_ebadf(_err: &io::Error) -> bool {
-    true
-}
-
-pub fn panic_output() -> Option<Vec<u8>> {
-    None
-}
diff --git a/src/libstd/sys/unsupported/thread.rs b/src/libstd/sys/unsupported/thread.rs
deleted file mode 100644
index 20ae309db30..00000000000
--- a/src/libstd/sys/unsupported/thread.rs
+++ /dev/null
@@ -1,41 +0,0 @@
-use super::{unsupported, Void};
-use crate::ffi::CStr;
-use crate::io;
-use crate::time::Duration;
-
-pub struct Thread(Void);
-
-pub const DEFAULT_MIN_STACK_SIZE: usize = 4096;
-
-impl Thread {
-    // unsafe: see thread::Builder::spawn_unchecked for safety requirements
-    pub unsafe fn new(_stack: usize, _p: Box<dyn FnOnce()>) -> io::Result<Thread> {
-        unsupported()
-    }
-
-    pub fn yield_now() {
-        // do nothing
-    }
-
-    pub fn set_name(_name: &CStr) {
-        // nope
-    }
-
-    pub fn sleep(_dur: Duration) {
-        panic!("can't sleep");
-    }
-
-    pub fn join(self) {
-        match self.0 {}
-    }
-}
-
-pub mod guard {
-    pub type Guard = !;
-    pub unsafe fn current() -> Option<Guard> {
-        None
-    }
-    pub unsafe fn init() -> Option<Guard> {
-        None
-    }
-}
diff --git a/src/libstd/sys/unsupported/thread_local_dtor.rs b/src/libstd/sys/unsupported/thread_local_dtor.rs
deleted file mode 100644
index 85d66098302..00000000000
--- a/src/libstd/sys/unsupported/thread_local_dtor.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-#![unstable(feature = "thread_local_internals", issue = "none")]
-
-pub unsafe fn register_dtor(_t: *mut u8, _dtor: unsafe extern "C" fn(*mut u8)) {
-    // FIXME: right now there is no concept of "thread exit", but this is likely
-    // going to show up at some point in the form of an exported symbol that the
-    // wasm runtime is going to be expected to call. For now we basically just
-    // ignore the arguments, but if such a function starts to exist it will
-    // likely look like the OSX implementation in `unix/fast_thread_local.rs`
-}
diff --git a/src/libstd/sys/unsupported/thread_local_key.rs b/src/libstd/sys/unsupported/thread_local_key.rs
deleted file mode 100644
index c31b61cbf56..00000000000
--- a/src/libstd/sys/unsupported/thread_local_key.rs
+++ /dev/null
@@ -1,26 +0,0 @@
-pub type Key = usize;
-
-#[inline]
-pub unsafe fn create(_dtor: Option<unsafe extern "C" fn(*mut u8)>) -> Key {
-    panic!("should not be used on this target");
-}
-
-#[inline]
-pub unsafe fn set(_key: Key, _value: *mut u8) {
-    panic!("should not be used on this target");
-}
-
-#[inline]
-pub unsafe fn get(_key: Key) -> *mut u8 {
-    panic!("should not be used on this target");
-}
-
-#[inline]
-pub unsafe fn destroy(_key: Key) {
-    panic!("should not be used on this target");
-}
-
-#[inline]
-pub fn requires_synchronized_create() -> bool {
-    panic!("should not be used on this target");
-}
diff --git a/src/libstd/sys/unsupported/time.rs b/src/libstd/sys/unsupported/time.rs
deleted file mode 100644
index 8aaf1777f24..00000000000
--- a/src/libstd/sys/unsupported/time.rs
+++ /dev/null
@@ -1,53 +0,0 @@
-use crate::time::Duration;
-
-#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
-pub struct Instant(Duration);
-
-#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
-pub struct SystemTime(Duration);
-
-pub const UNIX_EPOCH: SystemTime = SystemTime(Duration::from_secs(0));
-
-impl Instant {
-    pub fn now() -> Instant {
-        panic!("time not implemented on this platform")
-    }
-
-    pub const fn zero() -> Instant {
-        Instant(Duration::from_secs(0))
-    }
-
-    pub fn actually_monotonic() -> bool {
-        false
-    }
-
-    pub fn checked_sub_instant(&self, other: &Instant) -> Option<Duration> {
-        self.0.checked_sub(other.0)
-    }
-
-    pub fn checked_add_duration(&self, other: &Duration) -> Option<Instant> {
-        Some(Instant(self.0.checked_add(*other)?))
-    }
-
-    pub fn checked_sub_duration(&self, other: &Duration) -> Option<Instant> {
-        Some(Instant(self.0.checked_sub(*other)?))
-    }
-}
-
-impl SystemTime {
-    pub fn now() -> SystemTime {
-        panic!("time not implemented on this platform")
-    }
-
-    pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
-        self.0.checked_sub(other.0).ok_or_else(|| other.0 - self.0)
-    }
-
-    pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
-        Some(SystemTime(self.0.checked_add(*other)?))
-    }
-
-    pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
-        Some(SystemTime(self.0.checked_sub(*other)?))
-    }
-}