Merging upstream version 1.72.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

14 files changed, 3609 insertions, 0 deletions

diff --git a/vendor/rustix/src/maybe_polyfill/no_std/io/mod.rs b/vendor/rustix/src/maybe_polyfill/no_std/io/mod.rs
new file mode 100644
index 000000000..f0ad7504f
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/io/mod.rs
@@ -0,0 +1,107 @@
+//! The following is derived from Rust's
+//! library/std/src/sys/unix/io.rs
+//! dca3f1b786efd27be3b325ed1e01e247aa589c3b.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+
+#![allow(unsafe_code)]
+use crate::backend::c;
+#[cfg(not(linux_raw))]
+use c::size_t as __kernel_size_t;
+use core::marker::PhantomData;
+use core::slice;
+#[cfg(linux_raw)]
+use linux_raw_sys::general::__kernel_size_t;
+
+/// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html>
+#[derive(Copy, Clone)]
+#[repr(transparent)]
+pub struct IoSlice<'a> {
+    vec: c::iovec,
+    _p: PhantomData<&'a [u8]>,
+}
+
+impl<'a> IoSlice<'a> {
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.new>
+    #[inline]
+    pub fn new(buf: &'a [u8]) -> IoSlice<'a> {
+        IoSlice {
+            vec: c::iovec {
+                iov_base: buf.as_ptr() as *mut u8 as *mut c::c_void,
+                iov_len: buf.len() as _,
+            },
+            _p: PhantomData,
+        }
+    }
+
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.advance>
+    #[inline]
+    pub fn advance(&mut self, n: usize) {
+        if self.vec.iov_len < n as _ {
+            panic!("advancing IoSlice beyond its length");
+        }
+
+        unsafe {
+            // `__kernel_size_t` will always have the same size as `usize`, but it is a `u32` on
+            // 32-bit platforms and `u64` on 64-bit platforms when using `linux_raw` backend
+            self.vec.iov_len -= n as __kernel_size_t;
+            self.vec.iov_base = self.vec.iov_base.add(n);
+        }
+    }
+
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.as_slice>
+    #[inline]
+    pub fn as_slice(&self) -> &[u8] {
+        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len as usize) }
+    }
+}
+
+/// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html>
+#[repr(transparent)]
+pub struct IoSliceMut<'a> {
+    vec: c::iovec,
+    _p: PhantomData<&'a mut [u8]>,
+}
+
+impl<'a> IoSliceMut<'a> {
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.new>
+    #[inline]
+    pub fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> {
+        IoSliceMut {
+            vec: c::iovec {
+                iov_base: buf.as_mut_ptr() as *mut c::c_void,
+                iov_len: buf.len() as _,
+            },
+            _p: PhantomData,
+        }
+    }
+
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.advance>
+    #[inline]
+    pub fn advance(&mut self, n: usize) {
+        if self.vec.iov_len < n as _ {
+            panic!("advancing IoSliceMut beyond its length");
+        }
+
+        unsafe {
+            // `__kernel_size_t` will always have the same size as `usize`, but it is a `u32` on
+            // 32-bit platforms and `u64` on 64-bit platforms when using `linux_raw` backend
+            self.vec.iov_len -= n as __kernel_size_t;
+            self.vec.iov_base = self.vec.iov_base.add(n);
+        }
+    }
+
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.as_slice>
+    #[inline]
+    pub fn as_slice(&self) -> &[u8] {
+        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len as usize) }
+    }
+
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.as_slice_mut>
+    #[inline]
+    pub fn as_mut_slice(&mut self) -> &mut [u8] {
+        unsafe {
+            slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len as usize)
+        }
+    }
+}
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/mod.rs b/vendor/rustix/src/maybe_polyfill/no_std/mod.rs
new file mode 100644
index 000000000..ab088d862
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/mod.rs
@@ -0,0 +1,15 @@
+//! Polyfill of parts of the standard library for `no_std` builds.
+//!
+//! All code in this subtree is derived from the standard library and licensed MIT or Apache 2.0
+//! at your option.
+//!
+//! This implementation is used when `std` is not available and polyfills the necessary items from
+//! `std`. When the `std` feature is specified (so the standard library is available), the file
+//! `src/polyfill/std` is used instead, which just imports the respective items from `std`.
+
+#[cfg(not(windows))]
+pub mod io;
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+#[cfg(feature = "net")]
+pub mod net;
+pub mod os;
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/net/ip_addr.rs b/vendor/rustix/src/maybe_polyfill/no_std/net/ip_addr.rs
new file mode 100644
index 000000000..ffa5302e3
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/net/ip_addr.rs
@@ -0,0 +1,2068 @@
+//! The following is derived from Rust's
+//! library/std/src/net/ip_addr.rs at revision
+//! bd20fc1fd657b32f7aa1d70d8723f04c87f21606.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+//!
+//! This defines `IpAddr`, `Ipv4Addr`, and `Ipv6Addr`. Ideally, these should be
+//! defined in `core`. See [RFC 2832].
+//!
+//! [RFC 2832]: https://github.com/rust-lang/rfcs/pull/2832
+
+#![allow(unsafe_code)]
+
+use core::cmp::Ordering;
+use core::mem::transmute;
+
+/// An IP address, either IPv4 or IPv6.
+///
+/// This enum can contain either an [`Ipv4Addr`] or an [`Ipv6Addr`], see their
+/// respective documentation for more details.
+///
+/// # Examples
+///
+/// ```
+/// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+///
+/// let localhost_v4 = IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1));
+/// let localhost_v6 = IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
+///
+/// assert_eq!("127.0.0.1".parse(), Ok(localhost_v4));
+/// assert_eq!("::1".parse(), Ok(localhost_v6));
+///
+/// assert_eq!(localhost_v4.is_ipv6(), false);
+/// assert_eq!(localhost_v4.is_ipv4(), true);
+/// ```
+#[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))]
+#[derive(Copy, Clone, Eq, PartialEq, Hash, PartialOrd, Ord)]
+pub enum IpAddr {
+    /// An IPv4 address.
+    #[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))]
+    V4(#[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))] Ipv4Addr),
+    /// An IPv6 address.
+    #[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))]
+    V6(#[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))] Ipv6Addr),
+}
+
+/// An IPv4 address.
+///
+/// IPv4 addresses are defined as 32-bit integers in [IETF RFC 791].
+/// They are usually represented as four octets.
+///
+/// See [`IpAddr`] for a type encompassing both IPv4 and IPv6 addresses.
+///
+/// [IETF RFC 791]: https://tools.ietf.org/html/rfc791
+///
+/// # Textual representation
+///
+/// `Ipv4Addr` provides a [`FromStr`] implementation. The four octets are in decimal
+/// notation, divided by `.` (this is called "dot-decimal notation").
+/// Notably, octal numbers (which are indicated with a leading `0`) and hexadecimal numbers (which
+/// are indicated with a leading `0x`) are not allowed per [IETF RFC 6943].
+///
+/// [IETF RFC 6943]: https://tools.ietf.org/html/rfc6943#section-3.1.1
+/// [`FromStr`]: core::str::FromStr
+///
+/// # Examples
+///
+/// ```
+/// use std::net::Ipv4Addr;
+///
+/// let localhost = Ipv4Addr::new(127, 0, 0, 1);
+/// assert_eq!("127.0.0.1".parse(), Ok(localhost));
+/// assert_eq!(localhost.is_loopback(), true);
+/// assert!("012.004.002.000".parse::<Ipv4Addr>().is_err()); // all octets are in octal
+/// assert!("0000000.0.0.0".parse::<Ipv4Addr>().is_err()); // first octet is a zero in octal
+/// assert!("0xcb.0x0.0x71.0x00".parse::<Ipv4Addr>().is_err()); // all octets are in hex
+/// ```
+#[derive(Copy, Clone, PartialEq, Eq, Hash)]
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub struct Ipv4Addr {
+    octets: [u8; 4],
+}
+
+/// An IPv6 address.
+///
+/// IPv6 addresses are defined as 128-bit integers in [IETF RFC 4291].
+/// They are usually represented as eight 16-bit segments.
+///
+/// [IETF RFC 4291]: https://tools.ietf.org/html/rfc4291
+///
+/// # Embedding IPv4 Addresses
+///
+/// See [`IpAddr`] for a type encompassing both IPv4 and IPv6 addresses.
+///
+/// To assist in the transition from IPv4 to IPv6 two types of IPv6 addresses that embed an IPv4 address were defined:
+/// IPv4-compatible and IPv4-mapped addresses. Of these IPv4-compatible addresses have been officially deprecated.
+///
+/// Both types of addresses are not assigned any special meaning by this implementation,
+/// other than what the relevant standards prescribe. This means that an address like `::ffff:127.0.0.1`,
+/// while representing an IPv4 loopback address, is not itself an IPv6 loopback address; only `::1` is.
+/// To handle these so called "IPv4-in-IPv6" addresses, they have to first be converted to their canonical IPv4 address.
+///
+/// ### IPv4-Compatible IPv6 Addresses
+///
+/// IPv4-compatible IPv6 addresses are defined in [IETF RFC 4291 Section 2.5.5.1], and have been officially deprecated.
+/// The RFC describes the format of an "IPv4-Compatible IPv6 address" as follows:
+///
+/// ```text
+/// |                80 bits               | 16 |      32 bits        |
+/// +--------------------------------------+--------------------------+
+/// |0000..............................0000|0000|    IPv4 address     |
+/// +--------------------------------------+----+---------------------+
+/// ```
+/// So `::a.b.c.d` would be an IPv4-compatible IPv6 address representing the IPv4 address `a.b.c.d`.
+///
+/// To convert from an IPv4 address to an IPv4-compatible IPv6 address, use [`Ipv4Addr::to_ipv6_compatible`].
+/// Use [`Ipv6Addr::to_ipv4`] to convert an IPv4-compatible IPv6 address to the canonical IPv4 address.
+///
+/// [IETF RFC 4291 Section 2.5.5.1]: https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.5.1
+///
+/// ### IPv4-Mapped IPv6 Addresses
+///
+/// IPv4-mapped IPv6 addresses are defined in [IETF RFC 4291 Section 2.5.5.2].
+/// The RFC describes the format of an "IPv4-Mapped IPv6 address" as follows:
+///
+/// ```text
+/// |                80 bits               | 16 |      32 bits        |
+/// +--------------------------------------+--------------------------+
+/// |0000..............................0000|FFFF|    IPv4 address     |
+/// +--------------------------------------+----+---------------------+
+/// ```
+/// So `::ffff:a.b.c.d` would be an IPv4-mapped IPv6 address representing the IPv4 address `a.b.c.d`.
+///
+/// To convert from an IPv4 address to an IPv4-mapped IPv6 address, use [`Ipv4Addr::to_ipv6_mapped`].
+/// Use [`Ipv6Addr::to_ipv4`] to convert an IPv4-mapped IPv6 address to the canonical IPv4 address.
+/// Note that this will also convert the IPv6 loopback address `::1` to `0.0.0.1`. Use
+/// [`Ipv6Addr::to_ipv4_mapped`] to avoid this.
+///
+/// [IETF RFC 4291 Section 2.5.5.2]: https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.5.2
+///
+/// # Textual representation
+///
+/// `Ipv6Addr` provides a [`FromStr`] implementation. There are many ways to represent
+/// an IPv6 address in text, but in general, each segments is written in hexadecimal
+/// notation, and segments are separated by `:`. For more information, see
+/// [IETF RFC 5952].
+///
+/// [`FromStr`]: core::str::FromStr
+/// [IETF RFC 5952]: https://tools.ietf.org/html/rfc5952
+///
+/// # Examples
+///
+/// ```
+/// use std::net::Ipv6Addr;
+///
+/// let localhost = Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1);
+/// assert_eq!("::1".parse(), Ok(localhost));
+/// assert_eq!(localhost.is_loopback(), true);
+/// ```
+#[derive(Copy, Clone, PartialEq, Eq, Hash)]
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub struct Ipv6Addr {
+    octets: [u8; 16],
+}
+
+/// Scope of an [IPv6 multicast address] as defined in [IETF RFC 7346 section 2].
+///
+/// # Stability Guarantees
+///
+/// Not all possible values for a multicast scope have been assigned.
+/// Future RFCs may introduce new scopes, which will be added as variants to this enum;
+/// because of this the enum is marked as `#[non_exhaustive]`.
+///
+/// # Examples
+/// ```
+/// #![feature(ip)]
+///
+/// use std::net::Ipv6Addr;
+/// use std::net::Ipv6MulticastScope::*;
+///
+/// // An IPv6 multicast address with global scope (`ff0e::`).
+/// let address = Ipv6Addr::new(0xff0e, 0, 0, 0, 0, 0, 0, 0);
+///
+/// // Will print "Global scope".
+/// match address.multicast_scope() {
+///     Some(InterfaceLocal) => println!("Interface-Local scope"),
+///     Some(LinkLocal) => println!("Link-Local scope"),
+///     Some(RealmLocal) => println!("Realm-Local scope"),
+///     Some(AdminLocal) => println!("Admin-Local scope"),
+///     Some(SiteLocal) => println!("Site-Local scope"),
+///     Some(OrganizationLocal) => println!("Organization-Local scope"),
+///     Some(Global) => println!("Global scope"),
+///     Some(_) => println!("Unknown scope"),
+///     None => println!("Not a multicast address!")
+/// }
+///
+/// ```
+///
+/// [IPv6 multicast address]: Ipv6Addr
+/// [IETF RFC 7346 section 2]: https://tools.ietf.org/html/rfc7346#section-2
+#[derive(Copy, PartialEq, Eq, Clone, Hash, Debug)]
+#[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+#[non_exhaustive]
+pub enum Ipv6MulticastScope {
+    /// Interface-Local scope.
+    InterfaceLocal,
+    /// Link-Local scope.
+    LinkLocal,
+    /// Realm-Local scope.
+    RealmLocal,
+    /// Admin-Local scope.
+    AdminLocal,
+    /// Site-Local scope.
+    SiteLocal,
+    /// Organization-Local scope.
+    OrganizationLocal,
+    /// Global scope.
+    Global,
+}
+
+impl IpAddr {
+    /// Returns [`true`] for the special 'unspecified' address.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_unspecified()`] and
+    /// [`Ipv6Addr::is_unspecified()`] for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)).is_unspecified(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0)).is_unspecified(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ip_shared", since = "1.12.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_unspecified(&self) -> bool {
+        match self {
+            IpAddr::V4(ip) => ip.is_unspecified(),
+            IpAddr::V6(ip) => ip.is_unspecified(),
+        }
+    }
+
+    /// Returns [`true`] if this is a loopback address.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_loopback()`] and
+    /// [`Ipv6Addr::is_loopback()`] for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)).is_loopback(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0x1)).is_loopback(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ip_shared", since = "1.12.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_loopback(&self) -> bool {
+        match self {
+            IpAddr::V4(ip) => ip.is_loopback(),
+            IpAddr::V6(ip) => ip.is_loopback(),
+        }
+    }
+
+    /// Returns [`true`] if the address appears to be globally routable.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_global()`] and
+    /// [`Ipv6Addr::is_global()`] for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(80, 9, 12, 3)).is_global(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0, 0, 0x1c9, 0, 0, 0xafc8, 0, 0x1)).is_global(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ip", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_global(&self) -> bool {
+        match self {
+            IpAddr::V4(ip) => ip.is_global(),
+            IpAddr::V6(ip) => ip.is_global(),
+        }
+    }
+
+    /// Returns [`true`] if this is a multicast address.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_multicast()`] and
+    /// [`Ipv6Addr::is_multicast()`] for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(224, 254, 0, 0)).is_multicast(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0)).is_multicast(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ip_shared", since = "1.12.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_multicast(&self) -> bool {
+        match self {
+            IpAddr::V4(ip) => ip.is_multicast(),
+            IpAddr::V6(ip) => ip.is_multicast(),
+        }
+    }
+
+    /// Returns [`true`] if this address is in a range designated for documentation.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_documentation()`] and
+    /// [`Ipv6Addr::is_documentation()`] for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(203, 0, 113, 6)).is_documentation(), true);
+    /// assert_eq!(
+    ///     IpAddr::V6(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0)).is_documentation(),
+    ///     true
+    /// );
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ip", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_documentation(&self) -> bool {
+        match self {
+            IpAddr::V4(ip) => ip.is_documentation(),
+            IpAddr::V6(ip) => ip.is_documentation(),
+        }
+    }
+
+    /// Returns [`true`] if this address is in a range designated for benchmarking.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_benchmarking()`] and
+    /// [`Ipv6Addr::is_benchmarking()`] for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(198, 19, 255, 255)).is_benchmarking(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0x2001, 0x2, 0, 0, 0, 0, 0, 0)).is_benchmarking(), true);
+    /// ```
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_benchmarking(&self) -> bool {
+        match self {
+            IpAddr::V4(ip) => ip.is_benchmarking(),
+            IpAddr::V6(ip) => ip.is_benchmarking(),
+        }
+    }
+
+    /// Returns [`true`] if this address is an [`IPv4` address], and [`false`]
+    /// otherwise.
+    ///
+    /// [`IPv4` address]: IpAddr::V4
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(203, 0, 113, 6)).is_ipv4(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0)).is_ipv4(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ipaddr_checker", since = "1.16.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_ipv4(&self) -> bool {
+        matches!(self, IpAddr::V4(_))
+    }
+
+    /// Returns [`true`] if this address is an [`IPv6` address], and [`false`]
+    /// otherwise.
+    ///
+    /// [`IPv6` address]: IpAddr::V6
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(203, 0, 113, 6)).is_ipv6(), false);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0)).is_ipv6(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ipaddr_checker", since = "1.16.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_ipv6(&self) -> bool {
+        matches!(self, IpAddr::V6(_))
+    }
+
+    /// Converts this address to an `IpAddr::V4` if it is an IPv4-mapped IPv6 addresses, otherwise it
+    /// return `self` as-is.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)).to_canonical().is_loopback(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x7f00, 0x1)).is_loopback(), false);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x7f00, 0x1)).to_canonical().is_loopback(), true);
+    /// ```
+    #[inline]
+    #[must_use = "this returns the result of the operation, \
+                  without modifying the original"]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ip", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    pub const fn to_canonical(&self) -> IpAddr {
+        match self {
+            &v4 @ IpAddr::V4(_) => v4,
+            IpAddr::V6(v6) => v6.to_canonical(),
+        }
+    }
+}
+
+impl Ipv4Addr {
+    /// Creates a new IPv4 address from four eight-bit octets.
+    ///
+    /// The result will represent the IP address `a`.`b`.`c`.`d`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::new(127, 0, 0, 1);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_32", since = "1.32.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn new(a: u8, b: u8, c: u8, d: u8) -> Ipv4Addr {
+        Ipv4Addr {
+            octets: [a, b, c, d],
+        }
+    }
+
+    /// An IPv4 address with the address pointing to localhost: `127.0.0.1`
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::LOCALHOST;
+    /// assert_eq!(addr, Ipv4Addr::new(127, 0, 0, 1));
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "ip_constructors", since = "1.30.0"))]
+    pub const LOCALHOST: Self = Ipv4Addr::new(127, 0, 0, 1);
+
+    /// An IPv4 address representing an unspecified address: `0.0.0.0`
+    ///
+    /// This corresponds to the constant `INADDR_ANY` in other languages.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::UNSPECIFIED;
+    /// assert_eq!(addr, Ipv4Addr::new(0, 0, 0, 0));
+    /// ```
+    #[doc(alias = "INADDR_ANY")]
+    #[cfg_attr(staged_api, stable(feature = "ip_constructors", since = "1.30.0"))]
+    pub const UNSPECIFIED: Self = Ipv4Addr::new(0, 0, 0, 0);
+
+    /// An IPv4 address representing the broadcast address: `255.255.255.255`
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::BROADCAST;
+    /// assert_eq!(addr, Ipv4Addr::new(255, 255, 255, 255));
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "ip_constructors", since = "1.30.0"))]
+    pub const BROADCAST: Self = Ipv4Addr::new(255, 255, 255, 255);
+
+    /// Returns the four eight-bit integers that make up this address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::new(127, 0, 0, 1);
+    /// assert_eq!(addr.octets(), [127, 0, 0, 1]);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn octets(&self) -> [u8; 4] {
+        self.octets
+    }
+
+    /// Returns [`true`] for the special 'unspecified' address (`0.0.0.0`).
+    ///
+    /// This property is defined in _UNIX Network Programming, Second Edition_,
+    /// W. Richard Stevens, p. 891; see also [ip7].
+    ///
+    /// [ip7]: https://man7.org/linux/man-pages/man7/ip.7.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(0, 0, 0, 0).is_unspecified(), true);
+    /// assert_eq!(Ipv4Addr::new(45, 22, 13, 197).is_unspecified(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_32", since = "1.32.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ip_shared", since = "1.12.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_unspecified(&self) -> bool {
+        u32::from_be_bytes(self.octets) == 0
+    }
+
+    /// Returns [`true`] if this is a loopback address (`127.0.0.0/8`).
+    ///
+    /// This property is defined by [IETF RFC 1122].
+    ///
+    /// [IETF RFC 1122]: https://tools.ietf.org/html/rfc1122
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(127, 0, 0, 1).is_loopback(), true);
+    /// assert_eq!(Ipv4Addr::new(45, 22, 13, 197).is_loopback(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_loopback(&self) -> bool {
+        self.octets()[0] == 127
+    }
+
+    /// Returns [`true`] if this is a private address.
+    ///
+    /// The private address ranges are defined in [IETF RFC 1918] and include:
+    ///
+    ///  - `10.0.0.0/8`
+    ///  - `172.16.0.0/12`
+    ///  - `192.168.0.0/16`
+    ///
+    /// [IETF RFC 1918]: https://tools.ietf.org/html/rfc1918
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(10, 0, 0, 1).is_private(), true);
+    /// assert_eq!(Ipv4Addr::new(10, 10, 10, 10).is_private(), true);
+    /// assert_eq!(Ipv4Addr::new(172, 16, 10, 10).is_private(), true);
+    /// assert_eq!(Ipv4Addr::new(172, 29, 45, 14).is_private(), true);
+    /// assert_eq!(Ipv4Addr::new(172, 32, 0, 2).is_private(), false);
+    /// assert_eq!(Ipv4Addr::new(192, 168, 0, 2).is_private(), true);
+    /// assert_eq!(Ipv4Addr::new(192, 169, 0, 2).is_private(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_private(&self) -> bool {
+        match self.octets() {
+            [10, ..] => true,
+            [172, b, ..] if b >= 16 && b <= 31 => true,
+            [192, 168, ..] => true,
+            _ => false,
+        }
+    }
+
+    /// Returns [`true`] if the address is link-local (`169.254.0.0/16`).
+    ///
+    /// This property is defined by [IETF RFC 3927].
+    ///
+    /// [IETF RFC 3927]: https://tools.ietf.org/html/rfc3927
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(169, 254, 0, 0).is_link_local(), true);
+    /// assert_eq!(Ipv4Addr::new(169, 254, 10, 65).is_link_local(), true);
+    /// assert_eq!(Ipv4Addr::new(16, 89, 10, 65).is_link_local(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_link_local(&self) -> bool {
+        matches!(self.octets(), [169, 254, ..])
+    }
+
+    /// Returns [`true`] if the address appears to be globally reachable
+    /// as specified by the [IANA IPv4 Special-Purpose Address Registry].
+    /// Whether or not an address is practically reachable will depend on your network configuration.
+    ///
+    /// Most IPv4 addresses are globally reachable;
+    /// unless they are specifically defined as *not* globally reachable.
+    ///
+    /// Non-exhaustive list of notable addresses that are not globally reachable:
+    ///
+    /// - The [unspecified address] ([`is_unspecified`](Ipv4Addr::is_unspecified))
+    /// - Addresses reserved for private use ([`is_private`](Ipv4Addr::is_private))
+    /// - Addresses in the shared address space ([`is_shared`](Ipv4Addr::is_shared))
+    /// - Loopback addresses ([`is_loopback`](Ipv4Addr::is_loopback))
+    /// - Link-local addresses ([`is_link_local`](Ipv4Addr::is_link_local))
+    /// - Addresses reserved for documentation ([`is_documentation`](Ipv4Addr::is_documentation))
+    /// - Addresses reserved for benchmarking ([`is_benchmarking`](Ipv4Addr::is_benchmarking))
+    /// - Reserved addresses ([`is_reserved`](Ipv4Addr::is_reserved))
+    /// - The [broadcast address] ([`is_broadcast`](Ipv4Addr::is_broadcast))
+    ///
+    /// For the complete overview of which addresses are globally reachable, see the table at the [IANA IPv4 Special-Purpose Address Registry].
+    ///
+    /// [IANA IPv4 Special-Purpose Address Registry]: https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml
+    /// [unspecified address]: Ipv4Addr::UNSPECIFIED
+    /// [broadcast address]: Ipv4Addr::BROADCAST
+
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv4Addr;
+    ///
+    /// // Most IPv4 addresses are globally reachable:
+    /// assert_eq!(Ipv4Addr::new(80, 9, 12, 3).is_global(), true);
+    ///
+    /// // However some addresses have been assigned a special meaning
+    /// // that makes them not globally reachable. Some examples are:
+    ///
+    /// // The unspecified address (`0.0.0.0`)
+    /// assert_eq!(Ipv4Addr::UNSPECIFIED.is_global(), false);
+    ///
+    /// // Addresses reserved for private use (`10.0.0.0/8`, `172.16.0.0/12`, 192.168.0.0/16)
+    /// assert_eq!(Ipv4Addr::new(10, 254, 0, 0).is_global(), false);
+    /// assert_eq!(Ipv4Addr::new(192, 168, 10, 65).is_global(), false);
+    /// assert_eq!(Ipv4Addr::new(172, 16, 10, 65).is_global(), false);
+    ///
+    /// // Addresses in the shared address space (`100.64.0.0/10`)
+    /// assert_eq!(Ipv4Addr::new(100, 100, 0, 0).is_global(), false);
+    ///
+    /// // The loopback addresses (`127.0.0.0/8`)
+    /// assert_eq!(Ipv4Addr::LOCALHOST.is_global(), false);
+    ///
+    /// // Link-local addresses (`169.254.0.0/16`)
+    /// assert_eq!(Ipv4Addr::new(169, 254, 45, 1).is_global(), false);
+    ///
+    /// // Addresses reserved for documentation (`192.0.2.0/24`, `198.51.100.0/24`, `203.0.113.0/24`)
+    /// assert_eq!(Ipv4Addr::new(192, 0, 2, 255).is_global(), false);
+    /// assert_eq!(Ipv4Addr::new(198, 51, 100, 65).is_global(), false);
+    /// assert_eq!(Ipv4Addr::new(203, 0, 113, 6).is_global(), false);
+    ///
+    /// // Addresses reserved for benchmarking (`198.18.0.0/15`)
+    /// assert_eq!(Ipv4Addr::new(198, 18, 0, 0).is_global(), false);
+    ///
+    /// // Reserved addresses (`240.0.0.0/4`)
+    /// assert_eq!(Ipv4Addr::new(250, 10, 20, 30).is_global(), false);
+    ///
+    /// // The broadcast address (`255.255.255.255`)
+    /// assert_eq!(Ipv4Addr::BROADCAST.is_global(), false);
+    ///
+    /// // For a complete overview see the IANA IPv4 Special-Purpose Address Registry.
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv4", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_global(&self) -> bool {
+        !(self.octets()[0] == 0 // "This network"
+            || self.is_private()
+            || self.is_shared()
+            || self.is_loopback()
+            || self.is_link_local()
+            // addresses reserved for future protocols (`192.0.0.0/24`)
+            ||(self.octets()[0] == 192 && self.octets()[1] == 0 && self.octets()[2] == 0)
+            || self.is_documentation()
+            || self.is_benchmarking()
+            || self.is_reserved()
+            || self.is_broadcast())
+    }
+
+    /// Returns [`true`] if this address is part of the Shared Address Space defined in
+    /// [IETF RFC 6598] (`100.64.0.0/10`).
+    ///
+    /// [IETF RFC 6598]: https://tools.ietf.org/html/rfc6598
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(100, 64, 0, 0).is_shared(), true);
+    /// assert_eq!(Ipv4Addr::new(100, 127, 255, 255).is_shared(), true);
+    /// assert_eq!(Ipv4Addr::new(100, 128, 0, 0).is_shared(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv4", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_shared(&self) -> bool {
+        self.octets()[0] == 100 && (self.octets()[1] & 0b1100_0000 == 0b0100_0000)
+    }
+
+    /// Returns [`true`] if this address part of the `198.18.0.0/15` range, which is reserved for
+    /// network devices benchmarking. This range is defined in [IETF RFC 2544] as `192.18.0.0`
+    /// through `198.19.255.255` but [errata 423] corrects it to `198.18.0.0/15`.
+    ///
+    /// [IETF RFC 2544]: https://tools.ietf.org/html/rfc2544
+    /// [errata 423]: https://www.rfc-editor.org/errata/eid423
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(198, 17, 255, 255).is_benchmarking(), false);
+    /// assert_eq!(Ipv4Addr::new(198, 18, 0, 0).is_benchmarking(), true);
+    /// assert_eq!(Ipv4Addr::new(198, 19, 255, 255).is_benchmarking(), true);
+    /// assert_eq!(Ipv4Addr::new(198, 20, 0, 0).is_benchmarking(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv4", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_benchmarking(&self) -> bool {
+        self.octets()[0] == 198 && (self.octets()[1] & 0xfe) == 18
+    }
+
+    /// Returns [`true`] if this address is reserved by IANA for future use. [IETF RFC 1112]
+    /// defines the block of reserved addresses as `240.0.0.0/4`. This range normally includes the
+    /// broadcast address `255.255.255.255`, but this implementation explicitly excludes it, since
+    /// it is obviously not reserved for future use.
+    ///
+    /// [IETF RFC 1112]: https://tools.ietf.org/html/rfc1112
+    ///
+    /// # Warning
+    ///
+    /// As IANA assigns new addresses, this method will be
+    /// updated. This may result in non-reserved addresses being
+    /// treated as reserved in code that relies on an outdated version
+    /// of this method.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(240, 0, 0, 0).is_reserved(), true);
+    /// assert_eq!(Ipv4Addr::new(255, 255, 255, 254).is_reserved(), true);
+    ///
+    /// assert_eq!(Ipv4Addr::new(239, 255, 255, 255).is_reserved(), false);
+    /// // The broadcast address is not considered as reserved for future use by this implementation
+    /// assert_eq!(Ipv4Addr::new(255, 255, 255, 255).is_reserved(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv4", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_reserved(&self) -> bool {
+        self.octets()[0] & 240 == 240 && !self.is_broadcast()
+    }
+
+    /// Returns [`true`] if this is a multicast address (`224.0.0.0/4`).
+    ///
+    /// Multicast addresses have a most significant octet between `224` and `239`,
+    /// and is defined by [IETF RFC 5771].
+    ///
+    /// [IETF RFC 5771]: https://tools.ietf.org/html/rfc5771
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(224, 254, 0, 0).is_multicast(), true);
+    /// assert_eq!(Ipv4Addr::new(236, 168, 10, 65).is_multicast(), true);
+    /// assert_eq!(Ipv4Addr::new(172, 16, 10, 65).is_multicast(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_multicast(&self) -> bool {
+        self.octets()[0] >= 224 && self.octets()[0] <= 239
+    }
+
+    /// Returns [`true`] if this is a broadcast address (`255.255.255.255`).
+    ///
+    /// A broadcast address has all octets set to `255` as defined in [IETF RFC 919].
+    ///
+    /// [IETF RFC 919]: https://tools.ietf.org/html/rfc919
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(255, 255, 255, 255).is_broadcast(), true);
+    /// assert_eq!(Ipv4Addr::new(236, 168, 10, 65).is_broadcast(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_broadcast(&self) -> bool {
+        u32::from_be_bytes(self.octets()) == u32::from_be_bytes(Self::BROADCAST.octets())
+    }
+
+    /// Returns [`true`] if this address is in a range designated for documentation.
+    ///
+    /// This is defined in [IETF RFC 5737]:
+    ///
+    /// - `192.0.2.0/24` (TEST-NET-1)
+    /// - `198.51.100.0/24` (TEST-NET-2)
+    /// - `203.0.113.0/24` (TEST-NET-3)
+    ///
+    /// [IETF RFC 5737]: https://tools.ietf.org/html/rfc5737
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(192, 0, 2, 255).is_documentation(), true);
+    /// assert_eq!(Ipv4Addr::new(198, 51, 100, 65).is_documentation(), true);
+    /// assert_eq!(Ipv4Addr::new(203, 0, 113, 6).is_documentation(), true);
+    /// assert_eq!(Ipv4Addr::new(193, 34, 17, 19).is_documentation(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_documentation(&self) -> bool {
+        matches!(
+            self.octets(),
+            [192, 0, 2, _] | [198, 51, 100, _] | [203, 0, 113, _]
+        )
+    }
+
+    /// Converts this address to an [IPv4-compatible] [`IPv6` address].
+    ///
+    /// `a.b.c.d` becomes `::a.b.c.d`
+    ///
+    /// Note that IPv4-compatible addresses have been officially deprecated.
+    /// If you don't explicitly need an IPv4-compatible address for legacy reasons, consider using `to_ipv6_mapped` instead.
+    ///
+    /// [IPv4-compatible]: Ipv6Addr#ipv4-compatible-ipv6-addresses
+    /// [`IPv6` address]: Ipv6Addr
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(
+    ///     Ipv4Addr::new(192, 0, 2, 255).to_ipv6_compatible(),
+    ///     Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0xc000, 0x2ff)
+    /// );
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use = "this returns the result of the operation, \
+                  without modifying the original"]
+    #[inline]
+    pub const fn to_ipv6_compatible(&self) -> Ipv6Addr {
+        let [a, b, c, d] = self.octets();
+        Ipv6Addr {
+            octets: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, a, b, c, d],
+        }
+    }
+
+    /// Converts this address to an [IPv4-mapped] [`IPv6` address].
+    ///
+    /// `a.b.c.d` becomes `::ffff:a.b.c.d`
+    ///
+    /// [IPv4-mapped]: Ipv6Addr#ipv4-mapped-ipv6-addresses
+    /// [`IPv6` address]: Ipv6Addr
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(Ipv4Addr::new(192, 0, 2, 255).to_ipv6_mapped(),
+    ///            Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc000, 0x2ff));
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use = "this returns the result of the operation, \
+                  without modifying the original"]
+    #[inline]
+    pub const fn to_ipv6_mapped(&self) -> Ipv6Addr {
+        let [a, b, c, d] = self.octets();
+        Ipv6Addr {
+            octets: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, a, b, c, d],
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_from_ip", since = "1.16.0"))]
+impl From<Ipv4Addr> for IpAddr {
+    /// Copies this address to a new `IpAddr::V4`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr};
+    ///
+    /// let addr = Ipv4Addr::new(127, 0, 0, 1);
+    ///
+    /// assert_eq!(
+    ///     IpAddr::V4(addr),
+    ///     IpAddr::from(addr)
+    /// )
+    /// ```
+    #[inline]
+    fn from(ipv4: Ipv4Addr) -> IpAddr {
+        IpAddr::V4(ipv4)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_from_ip", since = "1.16.0"))]
+impl From<Ipv6Addr> for IpAddr {
+    /// Copies this address to a new `IpAddr::V6`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv6Addr};
+    ///
+    /// let addr = Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff);
+    ///
+    /// assert_eq!(
+    ///     IpAddr::V6(addr),
+    ///     IpAddr::from(addr)
+    /// );
+    /// ```
+    #[inline]
+    fn from(ipv6: Ipv6Addr) -> IpAddr {
+        IpAddr::V6(ipv6)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialEq<Ipv4Addr> for IpAddr {
+    #[inline]
+    fn eq(&self, other: &Ipv4Addr) -> bool {
+        match self {
+            IpAddr::V4(v4) => v4 == other,
+            IpAddr::V6(_) => false,
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialEq<IpAddr> for Ipv4Addr {
+    #[inline]
+    fn eq(&self, other: &IpAddr) -> bool {
+        match other {
+            IpAddr::V4(v4) => self == v4,
+            IpAddr::V6(_) => false,
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+impl PartialOrd for Ipv4Addr {
+    #[inline]
+    fn partial_cmp(&self, other: &Ipv4Addr) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialOrd<Ipv4Addr> for IpAddr {
+    #[inline]
+    fn partial_cmp(&self, other: &Ipv4Addr) -> Option<Ordering> {
+        match self {
+            IpAddr::V4(v4) => v4.partial_cmp(other),
+            IpAddr::V6(_) => Some(Ordering::Greater),
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialOrd<IpAddr> for Ipv4Addr {
+    #[inline]
+    fn partial_cmp(&self, other: &IpAddr) -> Option<Ordering> {
+        match other {
+            IpAddr::V4(v4) => self.partial_cmp(v4),
+            IpAddr::V6(_) => Some(Ordering::Less),
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+impl Ord for Ipv4Addr {
+    #[inline]
+    fn cmp(&self, other: &Ipv4Addr) -> Ordering {
+        self.octets.cmp(&other.octets)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_u32", since = "1.1.0"))]
+impl From<Ipv4Addr> for u32 {
+    /// Converts an `Ipv4Addr` into a host byte order `u32`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::new(0x12, 0x34, 0x56, 0x78);
+    /// assert_eq!(0x12345678, u32::from(addr));
+    /// ```
+    #[inline]
+    fn from(ip: Ipv4Addr) -> u32 {
+        u32::from_be_bytes(ip.octets)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_u32", since = "1.1.0"))]
+impl From<u32> for Ipv4Addr {
+    /// Converts a host byte order `u32` into an `Ipv4Addr`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::from(0x12345678);
+    /// assert_eq!(Ipv4Addr::new(0x12, 0x34, 0x56, 0x78), addr);
+    /// ```
+    #[inline]
+    fn from(ip: u32) -> Ipv4Addr {
+        Ipv4Addr {
+            octets: ip.to_be_bytes(),
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "from_slice_v4", since = "1.9.0"))]
+impl From<[u8; 4]> for Ipv4Addr {
+    /// Creates an `Ipv4Addr` from a four element byte array.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::from([13u8, 12u8, 11u8, 10u8]);
+    /// assert_eq!(Ipv4Addr::new(13, 12, 11, 10), addr);
+    /// ```
+    #[inline]
+    fn from(octets: [u8; 4]) -> Ipv4Addr {
+        Ipv4Addr { octets }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_from_slice", since = "1.17.0"))]
+impl From<[u8; 4]> for IpAddr {
+    /// Creates an `IpAddr::V4` from a four element byte array.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr};
+    ///
+    /// let addr = IpAddr::from([13u8, 12u8, 11u8, 10u8]);
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(13, 12, 11, 10)), addr);
+    /// ```
+    #[inline]
+    fn from(octets: [u8; 4]) -> IpAddr {
+        IpAddr::V4(Ipv4Addr::from(octets))
+    }
+}
+
+impl Ipv6Addr {
+    /// Creates a new IPv6 address from eight 16-bit segments.
+    ///
+    /// The result will represent the IP address `a:b:c:d:e:f:g:h`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_32", since = "1.32.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[allow(clippy::too_many_arguments)]
+    #[must_use]
+    #[inline]
+    pub const fn new(a: u16, b: u16, c: u16, d: u16, e: u16, f: u16, g: u16, h: u16) -> Ipv6Addr {
+        let addr16 = [
+            a.to_be(),
+            b.to_be(),
+            c.to_be(),
+            d.to_be(),
+            e.to_be(),
+            f.to_be(),
+            g.to_be(),
+            h.to_be(),
+        ];
+        Ipv6Addr {
+            // All elements in `addr16` are big endian.
+            // SAFETY: `[u16; 8]` is always safe to transmute to `[u8; 16]`.
+            octets: unsafe { transmute::<_, [u8; 16]>(addr16) },
+        }
+    }
+
+    /// An IPv6 address representing localhost: `::1`.
+    ///
+    /// This corresponds to constant `IN6ADDR_LOOPBACK_INIT` or `in6addr_loopback` in other
+    /// languages.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::LOCALHOST;
+    /// assert_eq!(addr, Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
+    /// ```
+    #[doc(alias = "IN6ADDR_LOOPBACK_INIT")]
+    #[doc(alias = "in6addr_loopback")]
+    #[cfg_attr(staged_api, stable(feature = "ip_constructors", since = "1.30.0"))]
+    pub const LOCALHOST: Self = Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1);
+
+    /// An IPv6 address representing the unspecified address: `::`
+    ///
+    /// This corresponds to constant `IN6ADDR_ANY_INIT` or `in6addr_any` in other languages.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::UNSPECIFIED;
+    /// assert_eq!(addr, Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0));
+    /// ```
+    #[doc(alias = "IN6ADDR_ANY_INIT")]
+    #[doc(alias = "in6addr_any")]
+    #[cfg_attr(staged_api, stable(feature = "ip_constructors", since = "1.30.0"))]
+    pub const UNSPECIFIED: Self = Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0);
+
+    /// Returns the eight 16-bit segments that make up this address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).segments(),
+    ///            [0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff]);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn segments(&self) -> [u16; 8] {
+        // All elements in `self.octets` must be big endian.
+        // SAFETY: `[u8; 16]` is always safe to transmute to `[u16; 8]`.
+        let [a, b, c, d, e, f, g, h] = unsafe { transmute::<_, [u16; 8]>(self.octets) };
+        // We want native endian u16
+        [
+            u16::from_be(a),
+            u16::from_be(b),
+            u16::from_be(c),
+            u16::from_be(d),
+            u16::from_be(e),
+            u16::from_be(f),
+            u16::from_be(g),
+            u16::from_be(h),
+        ]
+    }
+
+    /// Returns [`true`] for the special 'unspecified' address (`::`).
+    ///
+    /// This property is defined in [IETF RFC 4291].
+    ///
+    /// [IETF RFC 4291]: https://tools.ietf.org/html/rfc4291
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_unspecified(), false);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0).is_unspecified(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_unspecified(&self) -> bool {
+        u128::from_be_bytes(self.octets()) == u128::from_be_bytes(Ipv6Addr::UNSPECIFIED.octets())
+    }
+
+    /// Returns [`true`] if this is the [loopback address] (`::1`),
+    /// as defined in [IETF RFC 4291 section 2.5.3].
+    ///
+    /// Contrary to IPv4, in IPv6 there is only one loopback address.
+    ///
+    /// [loopback address]: Ipv6Addr::LOCALHOST
+    /// [IETF RFC 4291 section 2.5.3]: https://tools.ietf.org/html/rfc4291#section-2.5.3
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_loopback(), false);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0x1).is_loopback(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_loopback(&self) -> bool {
+        u128::from_be_bytes(self.octets()) == u128::from_be_bytes(Ipv6Addr::LOCALHOST.octets())
+    }
+
+    /// Returns [`true`] if the address appears to be globally reachable
+    /// as specified by the [IANA IPv6 Special-Purpose Address Registry].
+    /// Whether or not an address is practically reachable will depend on your network configuration.
+    ///
+    /// Most IPv6 addresses are globally reachable;
+    /// unless they are specifically defined as *not* globally reachable.
+    ///
+    /// Non-exhaustive list of notable addresses that are not globally reachable:
+    /// - The [unspecified address] ([`is_unspecified`](Ipv6Addr::is_unspecified))
+    /// - The [loopback address] ([`is_loopback`](Ipv6Addr::is_loopback))
+    /// - IPv4-mapped addresses
+    /// - Addresses reserved for benchmarking
+    /// - Addresses reserved for documentation ([`is_documentation`](Ipv6Addr::is_documentation))
+    /// - Unique local addresses ([`is_unique_local`](Ipv6Addr::is_unique_local))
+    /// - Unicast addresses with link-local scope ([`is_unicast_link_local`](Ipv6Addr::is_unicast_link_local))
+    ///
+    /// For the complete overview of which addresses are globally reachable, see the table at the [IANA IPv6 Special-Purpose Address Registry].
+    ///
+    /// Note that an address having global scope is not the same as being globally reachable,
+    /// and there is no direct relation between the two concepts: There exist addresses with global scope
+    /// that are not globally reachable (for example unique local addresses),
+    /// and addresses that are globally reachable without having global scope
+    /// (multicast addresses with non-global scope).
+    ///
+    /// [IANA IPv6 Special-Purpose Address Registry]: https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml
+    /// [unspecified address]: Ipv6Addr::UNSPECIFIED
+    /// [loopback address]: Ipv6Addr::LOCALHOST
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// // Most IPv6 addresses are globally reachable:
+    /// assert_eq!(Ipv6Addr::new(0x26, 0, 0x1c9, 0, 0, 0xafc8, 0x10, 0x1).is_global(), true);
+    ///
+    /// // However some addresses have been assigned a special meaning
+    /// // that makes them not globally reachable. Some examples are:
+    ///
+    /// // The unspecified address (`::`)
+    /// assert_eq!(Ipv6Addr::UNSPECIFIED.is_global(), false);
+    ///
+    /// // The loopback address (`::1`)
+    /// assert_eq!(Ipv6Addr::LOCALHOST.is_global(), false);
+    ///
+    /// // IPv4-mapped addresses (`::ffff:0:0/96`)
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_global(), false);
+    ///
+    /// // Addresses reserved for benchmarking (`2001:2::/48`)
+    /// assert_eq!(Ipv6Addr::new(0x2001, 2, 0, 0, 0, 0, 0, 1,).is_global(), false);
+    ///
+    /// // Addresses reserved for documentation (`2001:db8::/32`)
+    /// assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1).is_global(), false);
+    ///
+    /// // Unique local addresses (`fc00::/7`)
+    /// assert_eq!(Ipv6Addr::new(0xfc02, 0, 0, 0, 0, 0, 0, 1).is_global(), false);
+    ///
+    /// // Unicast addresses with link-local scope (`fe80::/10`)
+    /// assert_eq!(Ipv6Addr::new(0xfe81, 0, 0, 0, 0, 0, 0, 1).is_global(), false);
+    ///
+    /// // For a complete overview see the IANA IPv6 Special-Purpose Address Registry.
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_global(&self) -> bool {
+        !(self.is_unspecified()
+            || self.is_loopback()
+            // IPv4-mapped Address (`::ffff:0:0/96`)
+            || matches!(self.segments(), [0, 0, 0, 0, 0, 0xffff, _, _])
+            // IPv4-IPv6 Translat. (`64:ff9b:1::/48`)
+            || matches!(self.segments(), [0x64, 0xff9b, 1, _, _, _, _, _])
+            // Discard-Only Address Block (`100::/64`)
+            || matches!(self.segments(), [0x100, 0, 0, 0, _, _, _, _])
+            // IETF Protocol Assignments (`2001::/23`)
+            || (matches!(self.segments(), [0x2001, b, _, _, _, _, _, _] if b < 0x200)
+                && !(
+                    // Port Control Protocol Anycast (`2001:1::1`)
+                    u128::from_be_bytes(self.octets()) == 0x2001_0001_0000_0000_0000_0000_0000_0001
+                    // Traversal Using Relays around NAT Anycast (`2001:1::2`)
+                    || u128::from_be_bytes(self.octets()) == 0x2001_0001_0000_0000_0000_0000_0000_0002
+                    // AMT (`2001:3::/32`)
+                    || matches!(self.segments(), [0x2001, 3, _, _, _, _, _, _])
+                    // AS112-v6 (`2001:4:112::/48`)
+                    || matches!(self.segments(), [0x2001, 4, 0x112, _, _, _, _, _])
+                    // ORCHIDv2 (`2001:20::/28`)
+                    || matches!(self.segments(), [0x2001, b, _, _, _, _, _, _] if b >= 0x20 && b <= 0x2F)
+                ))
+            || self.is_documentation()
+            || self.is_unique_local()
+            || self.is_unicast_link_local())
+    }
+
+    /// Returns [`true`] if this is a unique local address (`fc00::/7`).
+    ///
+    /// This property is defined in [IETF RFC 4193].
+    ///
+    /// [IETF RFC 4193]: https://tools.ietf.org/html/rfc4193
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_unique_local(), false);
+    /// assert_eq!(Ipv6Addr::new(0xfc02, 0, 0, 0, 0, 0, 0, 0).is_unique_local(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_unique_local(&self) -> bool {
+        (self.segments()[0] & 0xfe00) == 0xfc00
+    }
+
+    /// Returns [`true`] if this is a unicast address, as defined by [IETF RFC 4291].
+    /// Any address that is not a [multicast address] (`ff00::/8`) is unicast.
+    ///
+    /// [IETF RFC 4291]: https://tools.ietf.org/html/rfc4291
+    /// [multicast address]: Ipv6Addr::is_multicast
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// // The unspecified and loopback addresses are unicast.
+    /// assert_eq!(Ipv6Addr::UNSPECIFIED.is_unicast(), true);
+    /// assert_eq!(Ipv6Addr::LOCALHOST.is_unicast(), true);
+    ///
+    /// // Any address that is not a multicast address (`ff00::/8`) is unicast.
+    /// assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0).is_unicast(), true);
+    /// assert_eq!(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0).is_unicast(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_unicast(&self) -> bool {
+        !self.is_multicast()
+    }
+
+    /// Returns `true` if the address is a unicast address with link-local scope,
+    /// as defined in [RFC 4291].
+    ///
+    /// A unicast address has link-local scope if it has the prefix `fe80::/10`, as per [RFC 4291 section 2.4].
+    /// Note that this encompasses more addresses than those defined in [RFC 4291 section 2.5.6],
+    /// which describes "Link-Local IPv6 Unicast Addresses" as having the following stricter format:
+    ///
+    /// ```text
+    /// | 10 bits  |         54 bits         |          64 bits           |
+    /// +----------+-------------------------+----------------------------+
+    /// |1111111010|           0             |       interface ID         |
+    /// +----------+-------------------------+----------------------------+
+    /// ```
+    /// So while currently the only addresses with link-local scope an application will encounter are all in `fe80::/64`,
+    /// this might change in the future with the publication of new standards. More addresses in `fe80::/10` could be allocated,
+    /// and those addresses will have link-local scope.
+    ///
+    /// Also note that while [RFC 4291 section 2.5.3] mentions about the [loopback address] (`::1`) that "it is treated as having Link-Local scope",
+    /// this does not mean that the loopback address actually has link-local scope and this method will return `false` on it.
+    ///
+    /// [RFC 4291]: https://tools.ietf.org/html/rfc4291
+    /// [RFC 4291 section 2.4]: https://tools.ietf.org/html/rfc4291#section-2.4
+    /// [RFC 4291 section 2.5.3]: https://tools.ietf.org/html/rfc4291#section-2.5.3
+    /// [RFC 4291 section 2.5.6]: https://tools.ietf.org/html/rfc4291#section-2.5.6
+    /// [loopback address]: Ipv6Addr::LOCALHOST
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// // The loopback address (`::1`) does not actually have link-local scope.
+    /// assert_eq!(Ipv6Addr::LOCALHOST.is_unicast_link_local(), false);
+    ///
+    /// // Only addresses in `fe80::/10` have link-local scope.
+    /// assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0).is_unicast_link_local(), false);
+    /// assert_eq!(Ipv6Addr::new(0xfe80, 0, 0, 0, 0, 0, 0, 0).is_unicast_link_local(), true);
+    ///
+    /// // Addresses outside the stricter `fe80::/64` also have link-local scope.
+    /// assert_eq!(Ipv6Addr::new(0xfe80, 0, 0, 1, 0, 0, 0, 0).is_unicast_link_local(), true);
+    /// assert_eq!(Ipv6Addr::new(0xfe81, 0, 0, 0, 0, 0, 0, 0).is_unicast_link_local(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_unicast_link_local(&self) -> bool {
+        (self.segments()[0] & 0xffc0) == 0xfe80
+    }
+
+    /// Returns [`true`] if this is an address reserved for documentation
+    /// (`2001:db8::/32`).
+    ///
+    /// This property is defined in [IETF RFC 3849].
+    ///
+    /// [IETF RFC 3849]: https://tools.ietf.org/html/rfc3849
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_documentation(), false);
+    /// assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0).is_documentation(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_documentation(&self) -> bool {
+        (self.segments()[0] == 0x2001) && (self.segments()[1] == 0xdb8)
+    }
+
+    /// Returns [`true`] if this is an address reserved for benchmarking (`2001:2::/48`).
+    ///
+    /// This property is defined in [IETF RFC 5180], where it is mistakenly specified as covering the range `2001:0200::/48`.
+    /// This is corrected in [IETF RFC Errata 1752] to `2001:0002::/48`.
+    ///
+    /// [IETF RFC 5180]: https://tools.ietf.org/html/rfc5180
+    /// [IETF RFC Errata 1752]: https://www.rfc-editor.org/errata_search.php?eid=1752
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc613, 0x0).is_benchmarking(), false);
+    /// assert_eq!(Ipv6Addr::new(0x2001, 0x2, 0, 0, 0, 0, 0, 0).is_benchmarking(), true);
+    /// ```
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_benchmarking(&self) -> bool {
+        (self.segments()[0] == 0x2001) && (self.segments()[1] == 0x2) && (self.segments()[2] == 0)
+    }
+
+    /// Returns [`true`] if the address is a globally routable unicast address.
+    ///
+    /// The following return false:
+    ///
+    /// - the loopback address
+    /// - the link-local addresses
+    /// - unique local addresses
+    /// - the unspecified address
+    /// - the address range reserved for documentation
+    ///
+    /// This method returns [`true`] for site-local addresses as per [RFC 4291 section 2.5.7]
+    ///
+    /// ```no_rust
+    /// The special behavior of [the site-local unicast] prefix defined in [RFC3513] must no longer
+    /// be supported in new implementations (i.e., new implementations must treat this prefix as
+    /// Global Unicast).
+    /// ```
+    ///
+    /// [RFC 4291 section 2.5.7]: https://tools.ietf.org/html/rfc4291#section-2.5.7
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0).is_unicast_global(), false);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_unicast_global(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_unicast_global(&self) -> bool {
+        self.is_unicast()
+            && !self.is_loopback()
+            && !self.is_unicast_link_local()
+            && !self.is_unique_local()
+            && !self.is_unspecified()
+            && !self.is_documentation()
+            && !self.is_benchmarking()
+    }
+
+    /// Returns the address's multicast scope if the address is multicast.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::{Ipv6Addr, Ipv6MulticastScope};
+    ///
+    /// assert_eq!(
+    ///     Ipv6Addr::new(0xff0e, 0, 0, 0, 0, 0, 0, 0).multicast_scope(),
+    ///     Some(Ipv6MulticastScope::Global)
+    /// );
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).multicast_scope(), None);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn multicast_scope(&self) -> Option<Ipv6MulticastScope> {
+        if self.is_multicast() {
+            match self.segments()[0] & 0x000f {
+                1 => Some(Ipv6MulticastScope::InterfaceLocal),
+                2 => Some(Ipv6MulticastScope::LinkLocal),
+                3 => Some(Ipv6MulticastScope::RealmLocal),
+                4 => Some(Ipv6MulticastScope::AdminLocal),
+                5 => Some(Ipv6MulticastScope::SiteLocal),
+                8 => Some(Ipv6MulticastScope::OrganizationLocal),
+                14 => Some(Ipv6MulticastScope::Global),
+                _ => None,
+            }
+        } else {
+            None
+        }
+    }
+
+    /// Returns [`true`] if this is a multicast address (`ff00::/8`).
+    ///
+    /// This property is defined by [IETF RFC 4291].
+    ///
+    /// [IETF RFC 4291]: https://tools.ietf.org/html/rfc4291
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0).is_multicast(), true);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_multicast(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_multicast(&self) -> bool {
+        (self.segments()[0] & 0xff00) == 0xff00
+    }
+
+    /// Converts this address to an [`IPv4` address] if it's an [IPv4-mapped] address,
+    /// as defined in [IETF RFC 4291 section 2.5.5.2], otherwise returns [`None`].
+    ///
+    /// `::ffff:a.b.c.d` becomes `a.b.c.d`.
+    /// All addresses *not* starting with `::ffff` will return `None`.
+    ///
+    /// [`IPv4` address]: Ipv4Addr
+    /// [IPv4-mapped]: Ipv6Addr
+    /// [IETF RFC 4291 section 2.5.5.2]: https://tools.ietf.org/html/rfc4291#section-2.5.5.2
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0).to_ipv4_mapped(), None);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).to_ipv4_mapped(),
+    ///            Some(Ipv4Addr::new(192, 10, 2, 255)));
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1).to_ipv4_mapped(), None);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ipv6_to_ipv4_mapped", since = "1.63.0"))]
+    #[must_use = "this returns the result of the operation, \
+                  without modifying the original"]
+    #[inline]
+    pub const fn to_ipv4_mapped(&self) -> Option<Ipv4Addr> {
+        match self.octets() {
+            [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, a, b, c, d] => {
+                Some(Ipv4Addr::new(a, b, c, d))
+            }
+            _ => None,
+        }
+    }
+
+    /// Converts this address to an [`IPv4` address] if it is either
+    /// an [IPv4-compatible] address as defined in [IETF RFC 4291 section 2.5.5.1],
+    /// or an [IPv4-mapped] address as defined in [IETF RFC 4291 section 2.5.5.2],
+    /// otherwise returns [`None`].
+    ///
+    /// Note that this will return an [`IPv4` address] for the IPv6 loopback address `::1`. Use
+    /// [`Ipv6Addr::to_ipv4_mapped`] to avoid this.
+    ///
+    /// `::a.b.c.d` and `::ffff:a.b.c.d` become `a.b.c.d`. `::1` becomes `0.0.0.1`.
+    /// All addresses *not* starting with either all zeroes or `::ffff` will return `None`.
+    ///
+    /// [`IPv4` address]: Ipv4Addr
+    /// [IPv4-compatible]: Ipv6Addr#ipv4-compatible-ipv6-addresses
+    /// [IPv4-mapped]: Ipv6Addr#ipv4-mapped-ipv6-addresses
+    /// [IETF RFC 4291 section 2.5.5.1]: https://tools.ietf.org/html/rfc4291#section-2.5.5.1
+    /// [IETF RFC 4291 section 2.5.5.2]: https://tools.ietf.org/html/rfc4291#section-2.5.5.2
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0).to_ipv4(), None);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).to_ipv4(),
+    ///            Some(Ipv4Addr::new(192, 10, 2, 255)));
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1).to_ipv4(),
+    ///            Some(Ipv4Addr::new(0, 0, 0, 1)));
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use = "this returns the result of the operation, \
+                  without modifying the original"]
+    #[inline]
+    pub const fn to_ipv4(&self) -> Option<Ipv4Addr> {
+        if let [0, 0, 0, 0, 0, 0 | 0xffff, ab, cd] = self.segments() {
+            let [a, b] = ab.to_be_bytes();
+            let [c, d] = cd.to_be_bytes();
+            Some(Ipv4Addr::new(a, b, c, d))
+        } else {
+            None
+        }
+    }
+
+    /// Converts this address to an `IpAddr::V4` if it is an IPv4-mapped addresses, otherwise it
+    /// returns self wrapped in an `IpAddr::V6`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x7f00, 0x1).is_loopback(), false);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x7f00, 0x1).to_canonical().is_loopback(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use = "this returns the result of the operation, \
+                  without modifying the original"]
+    #[inline]
+    pub const fn to_canonical(&self) -> IpAddr {
+        if let Some(mapped) = self.to_ipv4_mapped() {
+            return IpAddr::V4(mapped);
+        }
+        IpAddr::V6(*self)
+    }
+
+    /// Returns the sixteen eight-bit integers the IPv6 address consists of.
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0).octets(),
+    ///            [255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_32", since = "1.32.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ipv6_to_octets", since = "1.12.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn octets(&self) -> [u8; 16] {
+        self.octets
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialEq<IpAddr> for Ipv6Addr {
+    #[inline]
+    fn eq(&self, other: &IpAddr) -> bool {
+        match other {
+            IpAddr::V4(_) => false,
+            IpAddr::V6(v6) => self == v6,
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialEq<Ipv6Addr> for IpAddr {
+    #[inline]
+    fn eq(&self, other: &Ipv6Addr) -> bool {
+        match self {
+            IpAddr::V4(_) => false,
+            IpAddr::V6(v6) => v6 == other,
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+impl PartialOrd for Ipv6Addr {
+    #[inline]
+    fn partial_cmp(&self, other: &Ipv6Addr) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialOrd<Ipv6Addr> for IpAddr {
+    #[inline]
+    fn partial_cmp(&self, other: &Ipv6Addr) -> Option<Ordering> {
+        match self {
+            IpAddr::V4(_) => Some(Ordering::Less),
+            IpAddr::V6(v6) => v6.partial_cmp(other),
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialOrd<IpAddr> for Ipv6Addr {
+    #[inline]
+    fn partial_cmp(&self, other: &IpAddr) -> Option<Ordering> {
+        match other {
+            IpAddr::V4(_) => Some(Ordering::Greater),
+            IpAddr::V6(v6) => self.partial_cmp(v6),
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+impl Ord for Ipv6Addr {
+    #[inline]
+    fn cmp(&self, other: &Ipv6Addr) -> Ordering {
+        self.segments().cmp(&other.segments())
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "i128", since = "1.26.0"))]
+impl From<Ipv6Addr> for u128 {
+    /// Convert an `Ipv6Addr` into a host byte order `u128`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::new(
+    ///     0x1020, 0x3040, 0x5060, 0x7080,
+    ///     0x90A0, 0xB0C0, 0xD0E0, 0xF00D,
+    /// );
+    /// assert_eq!(0x102030405060708090A0B0C0D0E0F00D_u128, u128::from(addr));
+    /// ```
+    #[inline]
+    fn from(ip: Ipv6Addr) -> u128 {
+        u128::from_be_bytes(ip.octets)
+    }
+}
+#[cfg_attr(staged_api, stable(feature = "i128", since = "1.26.0"))]
+impl From<u128> for Ipv6Addr {
+    /// Convert a host byte order `u128` into an `Ipv6Addr`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::from(0x102030405060708090A0B0C0D0E0F00D_u128);
+    /// assert_eq!(
+    ///     Ipv6Addr::new(
+    ///         0x1020, 0x3040, 0x5060, 0x7080,
+    ///         0x90A0, 0xB0C0, 0xD0E0, 0xF00D,
+    ///     ),
+    ///     addr);
+    /// ```
+    #[inline]
+    fn from(ip: u128) -> Ipv6Addr {
+        Ipv6Addr::from(ip.to_be_bytes())
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ipv6_from_octets", since = "1.9.0"))]
+impl From<[u8; 16]> for Ipv6Addr {
+    /// Creates an `Ipv6Addr` from a sixteen element byte array.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::from([
+    ///     25u8, 24u8, 23u8, 22u8, 21u8, 20u8, 19u8, 18u8,
+    ///     17u8, 16u8, 15u8, 14u8, 13u8, 12u8, 11u8, 10u8,
+    /// ]);
+    /// assert_eq!(
+    ///     Ipv6Addr::new(
+    ///         0x1918, 0x1716,
+    ///         0x1514, 0x1312,
+    ///         0x1110, 0x0f0e,
+    ///         0x0d0c, 0x0b0a
+    ///     ),
+    ///     addr
+    /// );
+    /// ```
+    #[inline]
+    fn from(octets: [u8; 16]) -> Ipv6Addr {
+        Ipv6Addr { octets }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ipv6_from_segments", since = "1.16.0"))]
+impl From<[u16; 8]> for Ipv6Addr {
+    /// Creates an `Ipv6Addr` from an eight element 16-bit array.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::from([
+    ///     525u16, 524u16, 523u16, 522u16,
+    ///     521u16, 520u16, 519u16, 518u16,
+    /// ]);
+    /// assert_eq!(
+    ///     Ipv6Addr::new(
+    ///         0x20d, 0x20c,
+    ///         0x20b, 0x20a,
+    ///         0x209, 0x208,
+    ///         0x207, 0x206
+    ///     ),
+    ///     addr
+    /// );
+    /// ```
+    #[inline]
+    fn from(segments: [u16; 8]) -> Ipv6Addr {
+        let [a, b, c, d, e, f, g, h] = segments;
+        Ipv6Addr::new(a, b, c, d, e, f, g, h)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_from_slice", since = "1.17.0"))]
+impl From<[u8; 16]> for IpAddr {
+    /// Creates an `IpAddr::V6` from a sixteen element byte array.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv6Addr};
+    ///
+    /// let addr = IpAddr::from([
+    ///     25u8, 24u8, 23u8, 22u8, 21u8, 20u8, 19u8, 18u8,
+    ///     17u8, 16u8, 15u8, 14u8, 13u8, 12u8, 11u8, 10u8,
+    /// ]);
+    /// assert_eq!(
+    ///     IpAddr::V6(Ipv6Addr::new(
+    ///         0x1918, 0x1716,
+    ///         0x1514, 0x1312,
+    ///         0x1110, 0x0f0e,
+    ///         0x0d0c, 0x0b0a
+    ///     )),
+    ///     addr
+    /// );
+    /// ```
+    #[inline]
+    fn from(octets: [u8; 16]) -> IpAddr {
+        IpAddr::V6(Ipv6Addr::from(octets))
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_from_slice", since = "1.17.0"))]
+impl From<[u16; 8]> for IpAddr {
+    /// Creates an `IpAddr::V6` from an eight element 16-bit array.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv6Addr};
+    ///
+    /// let addr = IpAddr::from([
+    ///     525u16, 524u16, 523u16, 522u16,
+    ///     521u16, 520u16, 519u16, 518u16,
+    /// ]);
+    /// assert_eq!(
+    ///     IpAddr::V6(Ipv6Addr::new(
+    ///         0x20d, 0x20c,
+    ///         0x20b, 0x20a,
+    ///         0x209, 0x208,
+    ///         0x207, 0x206
+    ///     )),
+    ///     addr
+    /// );
+    /// ```
+    #[inline]
+    fn from(segments: [u16; 8]) -> IpAddr {
+        IpAddr::V6(Ipv6Addr::from(segments))
+    }
+}
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/net/mod.rs b/vendor/rustix/src/maybe_polyfill/no_std/net/mod.rs
new file mode 100644
index 000000000..ff3356482
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/net/mod.rs
@@ -0,0 +1,5 @@
+mod ip_addr;
+mod socket_addr;
+
+pub use self::ip_addr::{IpAddr, Ipv4Addr, Ipv6Addr, Ipv6MulticastScope};
+pub use self::socket_addr::{SocketAddr, SocketAddrV4, SocketAddrV6};
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/net/socket_addr.rs b/vendor/rustix/src/maybe_polyfill/no_std/net/socket_addr.rs
new file mode 100644
index 000000000..053d8f670
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/net/socket_addr.rs
@@ -0,0 +1,641 @@
+//! The following is derived from Rust's
+//! library/std/src/net/socket_addr.rs at revision
+//! bd20fc1fd657b32f7aa1d70d8723f04c87f21606.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+//!
+//! This defines `SocketAddr`, `SocketAddrV4`, and `SocketAddrV6` in a
+//! platform-independent way. It is not the native representation.
+
+use super::ip_addr::{IpAddr, Ipv4Addr, Ipv6Addr};
+use core::cmp::Ordering;
+use core::hash;
+
+/// An internet socket address, either IPv4 or IPv6.
+///
+/// Internet socket addresses consist of an [IP address], a 16-bit port number, as well
+/// as possibly some version-dependent additional information. See [`SocketAddrV4`]'s and
+/// [`SocketAddrV6`]'s respective documentation for more details.
+///
+/// The size of a `SocketAddr` instance may vary depending on the target operating
+/// system.
+///
+/// [IP address]: IpAddr
+///
+/// # Examples
+///
+/// ```
+/// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+///
+/// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
+///
+/// assert_eq!("127.0.0.1:8080".parse(), Ok(socket));
+/// assert_eq!(socket.port(), 8080);
+/// assert_eq!(socket.is_ipv4(), true);
+/// ```
+#[derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub enum SocketAddr {
+    /// An IPv4 socket address.
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    V4(#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))] SocketAddrV4),
+    /// An IPv6 socket address.
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    V6(#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))] SocketAddrV6),
+}
+
+/// An IPv4 socket address.
+///
+/// IPv4 socket addresses consist of an [`IPv4` address] and a 16-bit port number, as
+/// stated in [IETF RFC 793].
+///
+/// See [`SocketAddr`] for a type encompassing both IPv4 and IPv6 socket addresses.
+///
+/// The size of a `SocketAddrV4` struct may vary depending on the target operating
+/// system. Do not assume that this type has the same memory layout as the underlying
+/// system representation.
+///
+/// [IETF RFC 793]: https://tools.ietf.org/html/rfc793
+/// [`IPv4` address]: Ipv4Addr
+///
+/// # Examples
+///
+/// ```
+/// use std::net::{Ipv4Addr, SocketAddrV4};
+///
+/// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
+///
+/// assert_eq!("127.0.0.1:8080".parse(), Ok(socket));
+/// assert_eq!(socket.ip(), &Ipv4Addr::new(127, 0, 0, 1));
+/// assert_eq!(socket.port(), 8080);
+/// ```
+#[derive(Copy, Clone, Eq, PartialEq)]
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub struct SocketAddrV4 {
+    ip: Ipv4Addr,
+    port: u16,
+}
+
+/// An IPv6 socket address.
+///
+/// IPv6 socket addresses consist of an [`IPv6` address], a 16-bit port number, as well
+/// as fields containing the traffic class, the flow label, and a scope identifier
+/// (see [IETF RFC 2553, Section 3.3] for more details).
+///
+/// See [`SocketAddr`] for a type encompassing both IPv4 and IPv6 socket addresses.
+///
+/// The size of a `SocketAddrV6` struct may vary depending on the target operating
+/// system. Do not assume that this type has the same memory layout as the underlying
+/// system representation.
+///
+/// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
+/// [`IPv6` address]: Ipv6Addr
+///
+/// # Examples
+///
+/// ```
+/// use std::net::{Ipv6Addr, SocketAddrV6};
+///
+/// let socket = SocketAddrV6::new(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
+///
+/// assert_eq!("[2001:db8::1]:8080".parse(), Ok(socket));
+/// assert_eq!(socket.ip(), &Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1));
+/// assert_eq!(socket.port(), 8080);
+/// ```
+#[derive(Copy, Clone, Eq, PartialEq)]
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub struct SocketAddrV6 {
+    ip: Ipv6Addr,
+    port: u16,
+    flowinfo: u32,
+    scope_id: u32,
+}
+
+impl SocketAddr {
+    /// Creates a new socket address from an [IP address] and a port number.
+    ///
+    /// [IP address]: IpAddr
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+    ///
+    /// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
+    /// assert_eq!(socket.ip(), IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)));
+    /// assert_eq!(socket.port(), 8080);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))]
+    #[must_use]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn new(ip: IpAddr, port: u16) -> SocketAddr {
+        match ip {
+            IpAddr::V4(a) => SocketAddr::V4(SocketAddrV4::new(a, port)),
+            IpAddr::V6(a) => SocketAddr::V6(SocketAddrV6::new(a, port, 0, 0)),
+        }
+    }
+
+    /// Returns the IP address associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+    ///
+    /// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
+    /// assert_eq!(socket.ip(), IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)));
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn ip(&self) -> IpAddr {
+        match *self {
+            SocketAddr::V4(ref a) => IpAddr::V4(*a.ip()),
+            SocketAddr::V6(ref a) => IpAddr::V6(*a.ip()),
+        }
+    }
+
+    /// Changes the IP address associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+    ///
+    /// let mut socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
+    /// socket.set_ip(IpAddr::V4(Ipv4Addr::new(10, 10, 0, 1)));
+    /// assert_eq!(socket.ip(), IpAddr::V4(Ipv4Addr::new(10, 10, 0, 1)));
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_ip(&mut self, new_ip: IpAddr) {
+        // `match (*self, new_ip)` would have us mutate a copy of self only to throw it away.
+        match (self, new_ip) {
+            (&mut SocketAddr::V4(ref mut a), IpAddr::V4(new_ip)) => a.set_ip(new_ip),
+            (&mut SocketAddr::V6(ref mut a), IpAddr::V6(new_ip)) => a.set_ip(new_ip),
+            (self_, new_ip) => *self_ = Self::new(new_ip, self_.port()),
+        }
+    }
+
+    /// Returns the port number associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+    ///
+    /// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
+    /// assert_eq!(socket.port(), 8080);
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn port(&self) -> u16 {
+        match *self {
+            SocketAddr::V4(ref a) => a.port(),
+            SocketAddr::V6(ref a) => a.port(),
+        }
+    }
+
+    /// Changes the port number associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+    ///
+    /// let mut socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
+    /// socket.set_port(1025);
+    /// assert_eq!(socket.port(), 1025);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_port(&mut self, new_port: u16) {
+        match *self {
+            SocketAddr::V4(ref mut a) => a.set_port(new_port),
+            SocketAddr::V6(ref mut a) => a.set_port(new_port),
+        }
+    }
+
+    /// Returns [`true`] if the [IP address] in this `SocketAddr` is an
+    /// [`IPv4` address], and [`false`] otherwise.
+    ///
+    /// [IP address]: IpAddr
+    /// [`IPv4` address]: IpAddr::V4
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+    ///
+    /// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
+    /// assert_eq!(socket.is_ipv4(), true);
+    /// assert_eq!(socket.is_ipv6(), false);
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_checker", since = "1.16.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn is_ipv4(&self) -> bool {
+        matches!(*self, SocketAddr::V4(_))
+    }
+
+    /// Returns [`true`] if the [IP address] in this `SocketAddr` is an
+    /// [`IPv6` address], and [`false`] otherwise.
+    ///
+    /// [IP address]: IpAddr
+    /// [`IPv6` address]: IpAddr::V6
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv6Addr, SocketAddr};
+    ///
+    /// let socket = SocketAddr::new(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 65535, 0, 1)), 8080);
+    /// assert_eq!(socket.is_ipv4(), false);
+    /// assert_eq!(socket.is_ipv6(), true);
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_checker", since = "1.16.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn is_ipv6(&self) -> bool {
+        matches!(*self, SocketAddr::V6(_))
+    }
+}
+
+impl SocketAddrV4 {
+    /// Creates a new socket address from an [`IPv4` address] and a port number.
+    ///
+    /// [`IPv4` address]: Ipv4Addr
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV4, Ipv4Addr};
+    ///
+    /// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn new(ip: Ipv4Addr, port: u16) -> SocketAddrV4 {
+        SocketAddrV4 { ip, port }
+    }
+
+    /// Returns the IP address associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV4, Ipv4Addr};
+    ///
+    /// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
+    /// assert_eq!(socket.ip(), &Ipv4Addr::new(127, 0, 0, 1));
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn ip(&self) -> &Ipv4Addr {
+        &self.ip
+    }
+
+    /// Changes the IP address associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV4, Ipv4Addr};
+    ///
+    /// let mut socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
+    /// socket.set_ip(Ipv4Addr::new(192, 168, 0, 1));
+    /// assert_eq!(socket.ip(), &Ipv4Addr::new(192, 168, 0, 1));
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_ip(&mut self, new_ip: Ipv4Addr) {
+        self.ip = new_ip;
+    }
+
+    /// Returns the port number associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV4, Ipv4Addr};
+    ///
+    /// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
+    /// assert_eq!(socket.port(), 8080);
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn port(&self) -> u16 {
+        self.port
+    }
+
+    /// Changes the port number associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV4, Ipv4Addr};
+    ///
+    /// let mut socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
+    /// socket.set_port(4242);
+    /// assert_eq!(socket.port(), 4242);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_port(&mut self, new_port: u16) {
+        self.port = new_port;
+    }
+}
+
+impl SocketAddrV6 {
+    /// Creates a new socket address from an [`IPv6` address], a 16-bit port number,
+    /// and the `flowinfo` and `scope_id` fields.
+    ///
+    /// For more information on the meaning and layout of the `flowinfo` and `scope_id`
+    /// parameters, see [IETF RFC 2553, Section 3.3].
+    ///
+    /// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
+    /// [`IPv6` address]: Ipv6Addr
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn new(ip: Ipv6Addr, port: u16, flowinfo: u32, scope_id: u32) -> SocketAddrV6 {
+        SocketAddrV6 {
+            ip,
+            port,
+            flowinfo,
+            scope_id,
+        }
+    }
+
+    /// Returns the IP address associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
+    /// assert_eq!(socket.ip(), &Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn ip(&self) -> &Ipv6Addr {
+        &self.ip
+    }
+
+    /// Changes the IP address associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
+    /// socket.set_ip(Ipv6Addr::new(76, 45, 0, 0, 0, 0, 0, 0));
+    /// assert_eq!(socket.ip(), &Ipv6Addr::new(76, 45, 0, 0, 0, 0, 0, 0));
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_ip(&mut self, new_ip: Ipv6Addr) {
+        self.ip = new_ip;
+    }
+
+    /// Returns the port number associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
+    /// assert_eq!(socket.port(), 8080);
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn port(&self) -> u16 {
+        self.port
+    }
+
+    /// Changes the port number associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
+    /// socket.set_port(4242);
+    /// assert_eq!(socket.port(), 4242);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_port(&mut self, new_port: u16) {
+        self.port = new_port;
+    }
+
+    /// Returns the flow information associated with this address.
+    ///
+    /// This information corresponds to the `sin6_flowinfo` field in C's `netinet/in.h`,
+    /// as specified in [IETF RFC 2553, Section 3.3].
+    /// It combines information about the flow label and the traffic class as specified
+    /// in [IETF RFC 2460], respectively [Section 6] and [Section 7].
+    ///
+    /// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
+    /// [IETF RFC 2460]: https://tools.ietf.org/html/rfc2460
+    /// [Section 6]: https://tools.ietf.org/html/rfc2460#section-6
+    /// [Section 7]: https://tools.ietf.org/html/rfc2460#section-7
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 10, 0);
+    /// assert_eq!(socket.flowinfo(), 10);
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn flowinfo(&self) -> u32 {
+        self.flowinfo
+    }
+
+    /// Changes the flow information associated with this socket address.
+    ///
+    /// See [`SocketAddrV6::flowinfo`]'s documentation for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 10, 0);
+    /// socket.set_flowinfo(56);
+    /// assert_eq!(socket.flowinfo(), 56);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_flowinfo(&mut self, new_flowinfo: u32) {
+        self.flowinfo = new_flowinfo;
+    }
+
+    /// Returns the scope ID associated with this address.
+    ///
+    /// This information corresponds to the `sin6_scope_id` field in C's `netinet/in.h`,
+    /// as specified in [IETF RFC 2553, Section 3.3].
+    ///
+    /// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 78);
+    /// assert_eq!(socket.scope_id(), 78);
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn scope_id(&self) -> u32 {
+        self.scope_id
+    }
+
+    /// Changes the scope ID associated with this socket address.
+    ///
+    /// See [`SocketAddrV6::scope_id`]'s documentation for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 78);
+    /// socket.set_scope_id(42);
+    /// assert_eq!(socket.scope_id(), 42);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_scope_id(&mut self, new_scope_id: u32) {
+        self.scope_id = new_scope_id;
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_from_ip", since = "1.16.0"))]
+impl From<SocketAddrV4> for SocketAddr {
+    /// Converts a [`SocketAddrV4`] into a [`SocketAddr::V4`].
+    fn from(sock4: SocketAddrV4) -> SocketAddr {
+        SocketAddr::V4(sock4)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_from_ip", since = "1.16.0"))]
+impl From<SocketAddrV6> for SocketAddr {
+    /// Converts a [`SocketAddrV6`] into a [`SocketAddr::V6`].
+    fn from(sock6: SocketAddrV6) -> SocketAddr {
+        SocketAddr::V6(sock6)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "addr_from_into_ip", since = "1.17.0"))]
+impl<I: Into<IpAddr>> From<(I, u16)> for SocketAddr {
+    /// Converts a tuple struct (Into<[`IpAddr`]>, `u16`) into a [`SocketAddr`].
+    ///
+    /// This conversion creates a [`SocketAddr::V4`] for an [`IpAddr::V4`]
+    /// and creates a [`SocketAddr::V6`] for an [`IpAddr::V6`].
+    ///
+    /// `u16` is treated as port of the newly created [`SocketAddr`].
+    fn from(pieces: (I, u16)) -> SocketAddr {
+        SocketAddr::new(pieces.0.into(), pieces.1)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
+impl PartialOrd for SocketAddrV4 {
+    fn partial_cmp(&self, other: &SocketAddrV4) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
+impl PartialOrd for SocketAddrV6 {
+    fn partial_cmp(&self, other: &SocketAddrV6) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
+impl Ord for SocketAddrV4 {
+    fn cmp(&self, other: &SocketAddrV4) -> Ordering {
+        self.ip()
+            .cmp(other.ip())
+            .then(self.port().cmp(&other.port()))
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
+impl Ord for SocketAddrV6 {
+    fn cmp(&self, other: &SocketAddrV6) -> Ordering {
+        self.ip()
+            .cmp(other.ip())
+            .then(self.port().cmp(&other.port()))
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+impl hash::Hash for SocketAddrV4 {
+    fn hash<H: hash::Hasher>(&self, s: &mut H) {
+        (self.port, self.ip).hash(s)
+    }
+}
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+impl hash::Hash for SocketAddrV6 {
+    fn hash<H: hash::Hasher>(&self, s: &mut H) {
+        (self.port, &self.ip, self.flowinfo, self.scope_id).hash(s)
+    }
+}
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/fd/mod.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/fd/mod.rs
new file mode 100644
index 000000000..2d88fb076
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/fd/mod.rs
@@ -0,0 +1,19 @@
+//! The following is derived from Rust's
+//! library/std/src/os/fd/mod.rs at revision
+//! fa68e73e9947be8ffc5b3b46d899e4953a44e7e9.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+//!
+//! Owned and borrowed Unix-like file descriptors.
+
+#![cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+#![deny(unsafe_op_in_unsafe_fn)]
+
+// `RawFd`, `AsRawFd`, etc.
+mod raw;
+
+// `OwnedFd`, `AsFd`, etc.
+mod owned;
+
+pub use owned::*;
+pub use raw::*;
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/fd/owned.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/fd/owned.rs
new file mode 100644
index 000000000..90b6f4712
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/fd/owned.rs
@@ -0,0 +1,254 @@
+//! The following is derived from Rust's
+//! library/std/src/os/fd/owned.rs at revision
+//! fa68e73e9947be8ffc5b3b46d899e4953a44e7e9.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+//!
+//! Owned and borrowed Unix-like file descriptors.
+
+#![cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+#![deny(unsafe_op_in_unsafe_fn)]
+#![allow(unsafe_code)]
+
+use super::raw::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+use crate::io::close;
+use core::fmt;
+use core::marker::PhantomData;
+use core::mem::forget;
+
+/// A borrowed file descriptor.
+///
+/// This has a lifetime parameter to tie it to the lifetime of something that
+/// owns the file descriptor.
+///
+/// This uses `repr(transparent)` and has the representation of a host file
+/// descriptor, so it can be used in FFI in places where a file descriptor is
+/// passed as an argument, it is not captured or consumed, and it never has the
+/// value `-1`.
+///
+/// This type's `.to_owned()` implementation returns another `BorrowedFd`
+/// rather than an `OwnedFd`. It just makes a trivial copy of the raw file
+/// descriptor, which is then borrowed under the same lifetime.
+#[derive(Copy, Clone)]
+#[repr(transparent)]
+#[cfg_attr(rustc_attrs, rustc_layout_scalar_valid_range_start(0))]
+// libstd/os/raw/mod.rs assures me that every libstd-supported platform has a
+// 32-bit c_int. Below is -2, in two's complement, but that only works out
+// because c_int is 32 bits.
+#[cfg_attr(rustc_attrs, rustc_layout_scalar_valid_range_end(0xFF_FF_FF_FE))]
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+#[cfg_attr(rustc_attrs, rustc_nonnull_optimization_guaranteed)]
+pub struct BorrowedFd<'fd> {
+    fd: RawFd,
+    _phantom: PhantomData<&'fd OwnedFd>,
+}
+
+/// An owned file descriptor.
+///
+/// This closes the file descriptor on drop.
+///
+/// This uses `repr(transparent)` and has the representation of a host file
+/// descriptor, so it can be used in FFI in places where a file descriptor is
+/// passed as a consumed argument or returned as an owned value, and it never
+/// has the value `-1`.
+#[repr(transparent)]
+#[cfg_attr(rustc_attrs, rustc_layout_scalar_valid_range_start(0))]
+// libstd/os/raw/mod.rs assures me that every libstd-supported platform has a
+// 32-bit c_int. Below is -2, in two's complement, but that only works out
+// because c_int is 32 bits.
+#[cfg_attr(rustc_attrs, rustc_layout_scalar_valid_range_end(0xFF_FF_FF_FE))]
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+#[cfg_attr(rustc_attrs, rustc_nonnull_optimization_guaranteed)]
+pub struct OwnedFd {
+    fd: RawFd,
+}
+
+impl BorrowedFd<'_> {
+    /// Return a `BorrowedFd` holding the given raw file descriptor.
+    ///
+    /// # Safety
+    ///
+    /// The resource pointed to by `fd` must remain open for the duration of
+    /// the returned `BorrowedFd`, and it must not have the value `-1`.
+    #[inline]
+    #[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+    pub const unsafe fn borrow_raw(fd: RawFd) -> Self {
+        assert!(fd != u32::MAX as RawFd);
+        // SAFETY: we just asserted that the value is in the valid range and isn't `-1` (the only value bigger than `0xFF_FF_FF_FE` unsigned)
+        #[allow(unused_unsafe)]
+        unsafe {
+            Self {
+                fd,
+                _phantom: PhantomData,
+            }
+        }
+    }
+}
+
+impl OwnedFd {
+    /// Creates a new `OwnedFd` instance that shares the same underlying file handle
+    /// as the existing `OwnedFd` instance.
+    #[cfg(not(target_arch = "wasm32"))]
+    pub fn try_clone(&self) -> crate::io::Result<Self> {
+        // We want to atomically duplicate this file descriptor and set the
+        // CLOEXEC flag, and currently that's done via F_DUPFD_CLOEXEC. This
+        // is a POSIX flag that was added to Linux in 2.6.24.
+        #[cfg(not(target_os = "espidf"))]
+        let fd = crate::io::fcntl_dupfd_cloexec(self, 0)?;
+
+        // For ESP-IDF, F_DUPFD is used instead, because the CLOEXEC semantics
+        // will never be supported, as this is a bare metal framework with
+        // no capabilities for multi-process execution. While F_DUPFD is also
+        // not supported yet, it might be (currently it returns ENOSYS).
+        #[cfg(target_os = "espidf")]
+        let fd = crate::io::fcntl_dupfd(self)?;
+
+        Ok(fd.into())
+    }
+
+    #[cfg(target_arch = "wasm32")]
+    pub fn try_clone(&self) -> crate::io::Result<Self> {
+        Err(crate::io::const_io_error!(
+            crate::io::ErrorKind::Unsupported,
+            "operation not supported on WASI yet",
+        ))
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl AsRawFd for BorrowedFd<'_> {
+    #[inline]
+    fn as_raw_fd(&self) -> RawFd {
+        self.fd
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl AsRawFd for OwnedFd {
+    #[inline]
+    fn as_raw_fd(&self) -> RawFd {
+        self.fd
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl IntoRawFd for OwnedFd {
+    #[inline]
+    fn into_raw_fd(self) -> RawFd {
+        let fd = self.fd;
+        forget(self);
+        fd
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl FromRawFd for OwnedFd {
+    /// Constructs a new instance of `Self` from the given raw file descriptor.
+    ///
+    /// # Safety
+    ///
+    /// The resource pointed to by `fd` must be open and suitable for assuming
+    /// ownership. The resource must not require any cleanup other than `close`.
+    #[inline]
+    unsafe fn from_raw_fd(fd: RawFd) -> Self {
+        assert_ne!(fd, u32::MAX as RawFd);
+        // SAFETY: we just asserted that the value is in the valid range and isn't `-1` (the only value bigger than `0xFF_FF_FF_FE` unsigned)
+        #[allow(unused_unsafe)]
+        unsafe {
+            Self { fd }
+        }
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl Drop for OwnedFd {
+    #[inline]
+    fn drop(&mut self) {
+        unsafe {
+            // Errors are ignored when closing a file descriptor. The reason
+            // for this is that if an error occurs we don't actually know if
+            // the file descriptor was closed or not, and if we retried (for
+            // something like EINTR), we might close another valid file
+            // descriptor opened after we closed ours.
+            close(self.fd as _);
+        }
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl fmt::Debug for BorrowedFd<'_> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("BorrowedFd").field("fd", &self.fd).finish()
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl fmt::Debug for OwnedFd {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("OwnedFd").field("fd", &self.fd).finish()
+    }
+}
+
+/// A trait to borrow the file descriptor from an underlying object.
+///
+/// This is only available on unix platforms and must be imported in order to
+/// call the method. Windows platforms have a corresponding `AsHandle` and
+/// `AsSocket` set of traits.
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+pub trait AsFd {
+    /// Borrows the file descriptor.
+    ///
+    /// # Example
+    ///
+    /// ```no_run
+    /// # #![feature(io_safety)]
+    /// use std::fs::File;
+    /// # use std::io;
+    /// # #[cfg(target_os = "wasi")]
+    /// # use std::os::wasi::io::{AsFd, BorrowedFd};
+    /// # #[cfg(unix)]
+    /// # use std::os::unix::io::{AsFd, BorrowedFd};
+    ///
+    /// let mut f = File::open("foo.txt")?;
+    /// # #[cfg(any(unix, target_os = "wasi"))]
+    /// let borrowed_fd: BorrowedFd<'_> = f.as_fd();
+    /// # Ok::<(), io::Error>(())
+    /// ```
+    #[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+    fn as_fd(&self) -> BorrowedFd<'_>;
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl<T: AsFd> AsFd for &T {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        T::as_fd(self)
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl<T: AsFd> AsFd for &mut T {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        T::as_fd(self)
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl AsFd for BorrowedFd<'_> {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        *self
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl AsFd for OwnedFd {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        // SAFETY: `OwnedFd` and `BorrowedFd` have the same validity
+        // invariants, and the `BorrowedFd` is bounded by the lifetime
+        // of `&self`.
+        unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) }
+    }
+}
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/fd/raw.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/fd/raw.rs
new file mode 100644
index 000000000..41968ab04
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/fd/raw.rs
@@ -0,0 +1,161 @@
+//! The following is derived from Rust's
+//! library/std/src/os/fd/raw.rs at revision
+//! fa68e73e9947be8ffc5b3b46d899e4953a44e7e9.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+//!
+//! Raw Unix-like file descriptors.
+
+#![cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+#![allow(unsafe_code)]
+
+use crate::backend::c;
+
+/// Raw file descriptors.
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub type RawFd = c::c_int;
+
+/// A trait to extract the raw file descriptor from an underlying object.
+///
+/// This is only available on unix and WASI platforms and must be imported in
+/// order to call the method. Windows platforms have a corresponding
+/// `AsRawHandle` and `AsRawSocket` set of traits.
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub trait AsRawFd {
+    /// Extracts the raw file descriptor.
+    ///
+    /// This function is typically used to **borrow** an owned file descriptor.
+    /// When used in this way, this method does **not** pass ownership of the
+    /// raw file descriptor to the caller, and the file descriptor is only
+    /// guaranteed to be valid while the original object has not yet been
+    /// destroyed.
+    ///
+    /// However, borrowing is not strictly required. See [`AsFd::as_fd`]
+    /// for an API which strictly borrows a file descriptor.
+    ///
+    /// # Example
+    ///
+    /// ```no_run
+    /// use std::fs::File;
+    /// # use std::io;
+    /// #[cfg(unix)]
+    /// use std::os::unix::io::{AsRawFd, RawFd};
+    /// #[cfg(target_os = "wasi")]
+    /// use std::os::wasi::io::{AsRawFd, RawFd};
+    ///
+    /// let mut f = File::open("foo.txt")?;
+    /// // `raw_fd` is only valid as long as `f` exists.
+    /// #[cfg(any(unix, target_os = "wasi"))]
+    /// let raw_fd: RawFd = f.as_raw_fd();
+    /// # Ok::<(), io::Error>(())
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    fn as_raw_fd(&self) -> RawFd;
+}
+
+/// A trait to express the ability to construct an object from a raw file
+/// descriptor.
+#[cfg_attr(staged_api, stable(feature = "from_raw_os", since = "1.1.0"))]
+pub trait FromRawFd {
+    /// Constructs a new instance of `Self` from the given raw file
+    /// descriptor.
+    ///
+    /// This function is typically used to **consume ownership** of the
+    /// specified file descriptor. When used in this way, the returned object
+    /// will take responsibility for closing it when the object goes out of
+    /// scope.
+    ///
+    /// However, consuming ownership is not strictly required. Use a
+    /// [`From<OwnedFd>::from`] implementation for an API which strictly
+    /// consumes ownership.
+    ///
+    /// # Safety
+    ///
+    /// The `fd` passed in must be a valid an open file descriptor.
+    ///
+    /// # Example
+    ///
+    /// ```no_run
+    /// use std::fs::File;
+    /// # use std::io;
+    /// #[cfg(unix)]
+    /// use std::os::unix::io::{FromRawFd, IntoRawFd, RawFd};
+    /// #[cfg(target_os = "wasi")]
+    /// use std::os::wasi::io::{FromRawFd, IntoRawFd, RawFd};
+    ///
+    /// let f = File::open("foo.txt")?;
+    /// # #[cfg(any(unix, target_os = "wasi"))]
+    /// let raw_fd: RawFd = f.into_raw_fd();
+    /// // SAFETY: no other functions should call `from_raw_fd`, so there
+    /// // is only one owner for the file descriptor.
+    /// # #[cfg(any(unix, target_os = "wasi"))]
+    /// let f = unsafe { File::from_raw_fd(raw_fd) };
+    /// # Ok::<(), io::Error>(())
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "from_raw_os", since = "1.1.0"))]
+    unsafe fn from_raw_fd(fd: RawFd) -> Self;
+}
+
+/// A trait to express the ability to consume an object and acquire ownership of
+/// its raw file descriptor.
+#[cfg_attr(staged_api, stable(feature = "into_raw_os", since = "1.4.0"))]
+pub trait IntoRawFd {
+    /// Consumes this object, returning the raw underlying file descriptor.
+    ///
+    /// This function is typically used to **transfer ownership** of the underlying
+    /// file descriptor to the caller. When used in this way, callers are then the unique
+    /// owners of the file descriptor and must close it once it's no longer needed.
+    ///
+    /// However, transferring ownership is not strictly required. Use a
+    /// [`Into<OwnedFd>::into`] implementation for an API which strictly
+    /// transfers ownership.
+    ///
+    /// # Example
+    ///
+    /// ```no_run
+    /// use std::fs::File;
+    /// # use std::io;
+    /// #[cfg(unix)]
+    /// use std::os::unix::io::{IntoRawFd, RawFd};
+    /// #[cfg(target_os = "wasi")]
+    /// use std::os::wasi::io::{IntoRawFd, RawFd};
+    ///
+    /// let f = File::open("foo.txt")?;
+    /// #[cfg(any(unix, target_os = "wasi"))]
+    /// let raw_fd: RawFd = f.into_raw_fd();
+    /// # Ok::<(), io::Error>(())
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "into_raw_os", since = "1.4.0"))]
+    fn into_raw_fd(self) -> RawFd;
+}
+
+#[cfg_attr(
+    staged_api,
+    stable(feature = "raw_fd_reflexive_traits", since = "1.48.0")
+)]
+impl AsRawFd for RawFd {
+    #[inline]
+    fn as_raw_fd(&self) -> RawFd {
+        *self
+    }
+}
+#[cfg_attr(
+    staged_api,
+    stable(feature = "raw_fd_reflexive_traits", since = "1.48.0")
+)]
+impl IntoRawFd for RawFd {
+    #[inline]
+    fn into_raw_fd(self) -> RawFd {
+        self
+    }
+}
+#[cfg_attr(
+    staged_api,
+    stable(feature = "raw_fd_reflexive_traits", since = "1.48.0")
+)]
+impl FromRawFd for RawFd {
+    #[inline]
+    unsafe fn from_raw_fd(fd: RawFd) -> RawFd {
+        fd
+    }
+}
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/mod.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/mod.rs
new file mode 100644
index 000000000..67f41f5b3
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/mod.rs
@@ -0,0 +1,4 @@
+#[cfg(any(unix, target_os = "wasi"))]
+pub mod fd;
+#[cfg(windows)]
+pub mod windows;
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/mod.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/mod.rs
new file mode 100644
index 000000000..77abd03c5
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/mod.rs
@@ -0,0 +1,5 @@
+mod raw;
+mod socket;
+
+pub use raw::{AsRawSocket, FromRawSocket, IntoRawSocket, RawSocket};
+pub use socket::{AsSocket, BorrowedSocket, OwnedSocket};
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/raw.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/raw.rs
new file mode 100644
index 000000000..1e73e0019
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/raw.rs
@@ -0,0 +1,71 @@
+//! The following is derived from Rust's
+//! library/std/src/os/windows/io/raw.rs
+//! at revision
+//! 4f9b394c8a24803e57ba892fa00e539742ebafc0.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+
+use super::super::raw;
+
+/// Raw SOCKETs.
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub type RawSocket = raw::SOCKET;
+
+/// Extracts raw sockets.
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub trait AsRawSocket {
+    /// Extracts the raw socket.
+    ///
+    /// This function is typically used to **borrow** an owned socket.
+    /// When used in this way, this method does **not** pass ownership of the
+    /// raw socket to the caller, and the socket is only guaranteed
+    /// to be valid while the original object has not yet been destroyed.
+    ///
+    /// However, borrowing is not strictly required. See [`AsSocket::as_socket`]
+    /// for an API which strictly borrows a socket.
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    fn as_raw_socket(&self) -> RawSocket;
+}
+
+/// Creates I/O objects from raw sockets.
+#[cfg_attr(staged_api, stable(feature = "from_raw_os", since = "1.1.0"))]
+pub trait FromRawSocket {
+    /// Constructs a new I/O object from the specified raw socket.
+    ///
+    /// This function is typically used to **consume ownership** of the socket
+    /// given, passing responsibility for closing the socket to the returned
+    /// object. When used in this way, the returned object
+    /// will take responsibility for closing it when the object goes out of
+    /// scope.
+    ///
+    /// However, consuming ownership is not strictly required. Use a
+    /// `From<OwnedSocket>::from` implementation for an API which strictly
+    /// consumes ownership.
+    ///
+    /// # Safety
+    ///
+    /// The `socket` passed in must:
+    ///   - be a valid an open socket,
+    ///   - be a socket that may be freed via [`closesocket`].
+    ///
+    /// [`closesocket`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-closesocket
+    #[cfg_attr(staged_api, stable(feature = "from_raw_os", since = "1.1.0"))]
+    unsafe fn from_raw_socket(sock: RawSocket) -> Self;
+}
+
+/// A trait to express the ability to consume an object and acquire ownership of
+/// its raw `SOCKET`.
+#[cfg_attr(staged_api, stable(feature = "into_raw_os", since = "1.4.0"))]
+pub trait IntoRawSocket {
+    /// Consumes this object, returning the raw underlying socket.
+    ///
+    /// This function is typically used to **transfer ownership** of the underlying
+    /// socket to the caller. When used in this way, callers are then the unique
+    /// owners of the socket and must close it once it's no longer needed.
+    ///
+    /// However, transferring ownership is not strictly required. Use a
+    /// `Into<OwnedSocket>::into` implementation for an API which strictly
+    /// transfers ownership.
+    #[cfg_attr(staged_api, stable(feature = "into_raw_os", since = "1.4.0"))]
+    fn into_raw_socket(self) -> RawSocket;
+}
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/socket.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/socket.rs
new file mode 100644
index 000000000..bc637aa53
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/socket.rs
@@ -0,0 +1,199 @@
+//! The following is derived from Rust's
+//! library/std/src/os/windows/io/socket.rs
+//! at revision
+//! 4f9b394c8a24803e57ba892fa00e539742ebafc0.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+
+use super::raw::*;
+use crate::backend::c;
+use crate::backend::fd::LibcFd as LibcSocket;
+use core::fmt;
+use core::marker::PhantomData;
+use core::mem::forget;
+
+/// A borrowed socket.
+///
+/// This has a lifetime parameter to tie it to the lifetime of something that
+/// owns the socket.
+///
+/// This uses `repr(transparent)` and has the representation of a host socket,
+/// so it can be used in FFI in places where a socket is passed as an argument,
+/// it is not captured or consumed, and it never has the value
+/// `INVALID_SOCKET`.
+///
+/// This type's `.to_owned()` implementation returns another `BorrowedSocket`
+/// rather than an `OwnedSocket`. It just makes a trivial copy of the raw
+/// socket, which is then borrowed under the same lifetime.
+#[derive(Copy, Clone)]
+#[repr(transparent)]
+#[cfg_attr(staged_api, rustc_layout_scalar_valid_range_start(0))]
+// This is -2, in two's complement. -1 is `INVALID_SOCKET`.
+#[cfg_attr(
+    all(staged_api, target_pointer_width = "32"),
+    rustc_layout_scalar_valid_range_end(0xFF_FF_FF_FE)
+)]
+#[cfg_attr(
+    all(staged_api, target_pointer_width = "64"),
+    rustc_layout_scalar_valid_range_end(0xFF_FF_FF_FF_FF_FF_FF_FE)
+)]
+#[cfg_attr(staged_api, rustc_nonnull_optimization_guaranteed)]
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+pub struct BorrowedSocket<'socket> {
+    socket: RawSocket,
+    _phantom: PhantomData<&'socket OwnedSocket>,
+}
+
+/// An owned socket.
+///
+/// This closes the socket on drop.
+///
+/// This uses `repr(transparent)` and has the representation of a host socket,
+/// so it can be used in FFI in places where a socket is passed as a consumed
+/// argument or returned as an owned value, and it never has the value
+/// `INVALID_SOCKET`.
+#[repr(transparent)]
+#[cfg_attr(staged_api, rustc_layout_scalar_valid_range_start(0))]
+// This is -2, in two's complement. -1 is `INVALID_SOCKET`.
+#[cfg_attr(
+    all(staged_api, target_pointer_width = "32"),
+    rustc_layout_scalar_valid_range_end(0xFF_FF_FF_FE)
+)]
+#[cfg_attr(
+    all(staged_api, target_pointer_width = "64"),
+    rustc_layout_scalar_valid_range_end(0xFF_FF_FF_FF_FF_FF_FF_FE)
+)]
+#[cfg_attr(staged_api, rustc_nonnull_optimization_guaranteed)]
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+pub struct OwnedSocket {
+    socket: RawSocket,
+}
+
+impl BorrowedSocket<'_> {
+    /// Return a `BorrowedSocket` holding the given raw socket.
+    ///
+    /// # Safety
+    ///
+    /// The resource pointed to by `raw` must remain open for the duration of
+    /// the returned `BorrowedSocket`, and it must not have the value
+    /// `INVALID_SOCKET`.
+    #[inline]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "io_safety", since = "1.63.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+    pub const unsafe fn borrow_raw(socket: RawSocket) -> Self {
+        assert!(socket != c::INVALID_SOCKET as RawSocket);
+        Self {
+            socket,
+            _phantom: PhantomData,
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl AsRawSocket for BorrowedSocket<'_> {
+    #[inline]
+    fn as_raw_socket(&self) -> RawSocket {
+        self.socket
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl AsRawSocket for OwnedSocket {
+    #[inline]
+    fn as_raw_socket(&self) -> RawSocket {
+        self.socket
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl IntoRawSocket for OwnedSocket {
+    #[inline]
+    fn into_raw_socket(self) -> RawSocket {
+        let socket = self.socket;
+        forget(self);
+        socket
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl FromRawSocket for OwnedSocket {
+    #[inline]
+    unsafe fn from_raw_socket(socket: RawSocket) -> Self {
+        debug_assert_ne!(socket, c::INVALID_SOCKET as RawSocket);
+        Self { socket }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl Drop for OwnedSocket {
+    #[inline]
+    fn drop(&mut self) {
+        unsafe {
+            let _ = c::closesocket(self.socket as LibcSocket);
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl fmt::Debug for BorrowedSocket<'_> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("BorrowedSocket")
+            .field("socket", &self.socket)
+            .finish()
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl fmt::Debug for OwnedSocket {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("OwnedSocket")
+            .field("socket", &self.socket)
+            .finish()
+    }
+}
+
+/// A trait to borrow the socket from an underlying object.
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+pub trait AsSocket {
+    /// Borrows the socket.
+    #[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+    fn as_socket(&self) -> BorrowedSocket<'_>;
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl<T: AsSocket> AsSocket for &T {
+    #[inline]
+    fn as_socket(&self) -> BorrowedSocket<'_> {
+        T::as_socket(self)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl<T: AsSocket> AsSocket for &mut T {
+    #[inline]
+    fn as_socket(&self) -> BorrowedSocket<'_> {
+        T::as_socket(self)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl AsSocket for BorrowedSocket<'_> {
+    #[inline]
+    fn as_socket(&self) -> BorrowedSocket<'_> {
+        *self
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl AsSocket for OwnedSocket {
+    #[inline]
+    fn as_socket(&self) -> BorrowedSocket<'_> {
+        // Safety: `OwnedSocket` and `BorrowedSocket` have the same validity
+        // invariants, and the `BorrowdSocket` is bounded by the lifetime
+        // of `&self`.
+        unsafe { BorrowedSocket::borrow_raw(self.as_raw_socket()) }
+    }
+}
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/windows/mod.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/mod.rs
new file mode 100644
index 000000000..02f389497
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/mod.rs
@@ -0,0 +1,19 @@
+//! The following is derived from Rust's
+//! library/std/src/os/windows/raw.rs,
+//! library/std/src/os/windows/io/raw.rs and
+//! library/std/src/os/windows/io/socket.rs
+//! at revision
+//! 4f9b394c8a24803e57ba892fa00e539742ebafc0.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+
+mod raw {
+    #[cfg(target_pointer_width = "32")]
+    #[cfg_attr(staged_api, stable(feature = "raw_ext", since = "1.1.0"))]
+    pub type SOCKET = u32;
+    #[cfg(target_pointer_width = "64")]
+    #[cfg_attr(staged_api, stable(feature = "raw_ext", since = "1.1.0"))]
+    pub type SOCKET = u64;
+}
+
+pub mod io;
diff --git a/vendor/rustix/src/maybe_polyfill/std/mod.rs b/vendor/rustix/src/maybe_polyfill/std/mod.rs
new file mode 100644
index 000000000..92b5cab5b
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/std/mod.rs
@@ -0,0 +1,41 @@
+//! Imports from `std` that would be polyfilled for `no_std` builds (see `src/polyfill/no_std`).
+//!
+//! This implementation is used when `std` is available and just imports the necessary items from
+//! `std`. For `no_std` builds, the file `src/polyfill/no_std` is used instead, which doesn't
+//! depend on the standard library.
+
+#[cfg(not(windows))]
+pub mod io {
+    pub use std::io::{IoSlice, IoSliceMut};
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+#[cfg(feature = "net")]
+pub mod net {
+    pub use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
+}
+
+pub mod os {
+    pub mod fd {
+        // Change  to use `std::os::fd` when MSRV becomes 1.66 or higher.
+
+        #[cfg(unix)]
+        pub use std::os::unix::io::{
+            AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd,
+        };
+        #[cfg(target_os = "wasi")]
+        pub use std::os::wasi::io::{
+            AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd,
+        };
+    }
+
+    #[cfg(windows)]
+    pub mod windows {
+        pub mod io {
+            pub use std::os::windows::io::{
+                AsRawSocket, AsSocket, BorrowedSocket, FromRawSocket, IntoRawSocket, OwnedSocket,
+                RawSocket,
+            };
+        }
+    }
+}