Rollup merge of rust-lang#141744 - GrigorenkoPV:ip_from, r=Amanieu

Stabilize `ip_from`

Tracking issue: rust-lang#131360

Stabilizes and const-stabilizes the following APIs:
```rust
// core::net
impl Ipv4Addr {
    pub const fn from_octets(octets: [u8; 4]) -> Ipv4Addr;
}
impl Ipv6Addr {
    pub const fn from_octets(octets: [u8; 16]) -> Ipv6Addr;
    pub const fn from_segments(segments: [u16; 8]) -> Ipv6Addr;
}
```

Closes rust-lang#131360

``@rustbot`` label +needs-fcp

Author: Zalathar

library/core/src/net/ip_addr.rs

@@ -626,13 +626,13 @@ impl Ipv4Addr {
     /// # Examples
     ///
     /// ```
-    /// #![feature(ip_from)]
     /// use std::net::Ipv4Addr;
     ///
     /// let addr = Ipv4Addr::from_octets([13u8, 12u8, 11u8, 10u8]);
     /// assert_eq!(Ipv4Addr::new(13, 12, 11, 10), addr);
     /// ```
-    #[unstable(feature = "ip_from", issue = "131360")]
+    #[stable(feature = "ip_from", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "ip_from", since = "CURRENT_RUSTC_VERSION")]
     #[must_use]
     #[inline]
     pub const fn from_octets(octets: [u8; 4]) -> Ipv4Addr {
@@ -1464,7 +1464,6 @@ impl Ipv6Addr {
     /// # Examples
     ///
     /// ```
-    /// #![feature(ip_from)]
     /// use std::net::Ipv6Addr;
     ///
     /// let addr = Ipv6Addr::from_segments([
@@ -1479,7 +1478,8 @@ impl Ipv6Addr {
     ///     addr
     /// );
     /// ```
-    #[unstable(feature = "ip_from", issue = "131360")]
+    #[stable(feature = "ip_from", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "ip_from", since = "CURRENT_RUSTC_VERSION")]
     #[must_use]
     #[inline]
     pub const fn from_segments(segments: [u16; 8]) -> Ipv6Addr {
@@ -2029,7 +2029,6 @@ impl Ipv6Addr {
     /// # Examples
     ///
     /// ```
-    /// #![feature(ip_from)]
     /// use std::net::Ipv6Addr;
     ///
     /// let addr = Ipv6Addr::from_octets([
@@ -2044,7 +2043,8 @@ impl Ipv6Addr {
     ///     addr
     /// );
     /// ```
-    #[unstable(feature = "ip_from", issue = "131360")]
+    #[stable(feature = "ip_from", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "ip_from", since = "CURRENT_RUSTC_VERSION")]
     #[must_use]
     #[inline]
     pub const fn from_octets(octets: [u8; 16]) -> Ipv6Addr {

library/coretests/tests/lib.rs

@@ -56,7 +56,6 @@
 #![feature(hashmap_internals)]
 #![feature(int_roundings)]
 #![feature(ip)]
-#![feature(ip_from)]
 #![feature(is_ascii_octdigit)]
 #![feature(isolate_most_least_significant_one)]
 #![feature(iter_advance_by)]