Auto merge of #131715 - tgross35:add-const_sockaddr_setters, r=Amanieu

Add an unstable `const_sockaddr_setters` feature
Unstably add `const` to the `sockaddr_setters` methods. Included API:
```rust
// core::net
impl SocketAddr {
pub const fn set_ip(&mut self, new_ip: IpAddr);
pub const fn set_port(&mut self, new_port: u16);
}
impl SocketAddrV4 {
pub const fn set_ip(&mut self, new_ip: Ipv4Addr);
pub const fn set_port(&mut self, new_port: u16);
}
impl SocketAddrV6 {
pub const fn set_ip(&mut self, new_ip: Ipv6Addr);
pub const fn set_port(&mut self, new_port: u16);
}
```
Tracking issue: <#131714>

Author: bors

library/core/src/lib.rs

@@ -134,6 +134,7 @@
 #![feature(const_raw_ptr_comparison)]
 #![feature(const_size_of_val)]
 #![feature(const_size_of_val_raw)]
+#![feature(const_sockaddr_setters)]
 #![feature(const_strict_overflow_ops)]
 #![feature(const_swap)]
 #![feature(const_try)]

library/core/src/net/socket_addr.rs

@@ -198,9 +198,10 @@ impl SocketAddr {
 /// socket.set_ip(IpAddr::V4(Ipv4Addr::new(10, 10, 0, 1)));
 /// assert_eq!(socket.ip(), IpAddr::V4(Ipv4Addr::new(10, 10, 0, 1)));
 /// ```
-#[stable(feature = "sockaddr_setters", since = "1.9.0")]
 #[inline]
-pubfnset_ip(&mutself,new_ip:IpAddr){
+#[stable(feature = "sockaddr_setters", since = "1.9.0")]
+#[rustc_const_unstable(feature = "const_sockaddr_setters", issue = "131714")]
+pubconstfnset_ip(&mutself,new_ip:IpAddr){
 // `match (*self, new_ip)` would have us mutate a copy of self only to throw it away.
 match(self, new_ip){
 (&mutSocketAddr::V4(refmut a),IpAddr::V4(new_ip)) => a.set_ip(new_ip),
@@ -241,9 +242,10 @@ impl SocketAddr {
 /// socket.set_port(1025);
 /// assert_eq!(socket.port(), 1025);
 /// ```
-#[stable(feature = "sockaddr_setters", since = "1.9.0")]
 #[inline]
-pubfnset_port(&mutself,new_port:u16){
+#[stable(feature = "sockaddr_setters", since = "1.9.0")]
+#[rustc_const_unstable(feature = "const_sockaddr_setters", issue = "131714")]
+pubconstfnset_port(&mutself,new_port:u16){
 match*self{
 SocketAddr::V4(refmut a) => a.set_port(new_port),
 SocketAddr::V6(refmut a) => a.set_port(new_port),
@@ -346,9 +348,10 @@ impl SocketAddrV4 {
 /// socket.set_ip(Ipv4Addr::new(192, 168, 0, 1));
 /// assert_eq!(socket.ip(), &Ipv4Addr::new(192, 168, 0, 1));
 /// ```
-#[stable(feature = "sockaddr_setters", since = "1.9.0")]
 #[inline]
-pubfnset_ip(&mutself,new_ip:Ipv4Addr){
+#[stable(feature = "sockaddr_setters", since = "1.9.0")]
+#[rustc_const_unstable(feature = "const_sockaddr_setters", issue = "131714")]
+pubconstfnset_ip(&mutself,new_ip:Ipv4Addr){
 self.ip = new_ip;
 }
 
@@ -381,9 +384,10 @@ impl SocketAddrV4 {
 /// socket.set_port(4242);
 /// assert_eq!(socket.port(), 4242);
 /// ```
-#[stable(feature = "sockaddr_setters", since = "1.9.0")]
 #[inline]
-pubfnset_port(&mutself,new_port:u16){
+#[stable(feature = "sockaddr_setters", since = "1.9.0")]
+#[rustc_const_unstable(feature = "const_sockaddr_setters", issue = "131714")]
+pubconstfnset_port(&mutself,new_port:u16){
 self.port = new_port;
 }
 }
@@ -442,9 +446,10 @@ impl SocketAddrV6 {
 /// 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));
 /// ```
-#[stable(feature = "sockaddr_setters", since = "1.9.0")]
 #[inline]
-pubfnset_ip(&mutself,new_ip:Ipv6Addr){
+#[stable(feature = "sockaddr_setters", since = "1.9.0")]
+#[rustc_const_unstable(feature = "const_sockaddr_setters", issue = "131714")]
+pubconstfnset_ip(&mutself,new_ip:Ipv6Addr){
 self.ip = new_ip;
 }
 
@@ -477,9 +482,10 @@ impl SocketAddrV6 {
 /// socket.set_port(4242);
 /// assert_eq!(socket.port(), 4242);
 /// ```
-#[stable(feature = "sockaddr_setters", since = "1.9.0")]
 #[inline]
-pubfnset_port(&mutself,new_port:u16){
+#[stable(feature = "sockaddr_setters", since = "1.9.0")]
+#[rustc_const_unstable(feature = "const_sockaddr_setters", issue = "131714")]
+pubconstfnset_port(&mutself,new_port:u16){
 self.port = new_port;
 }
 
@@ -524,9 +530,10 @@ impl SocketAddrV6 {
 /// socket.set_flowinfo(56);
 /// assert_eq!(socket.flowinfo(), 56);
 /// ```
-#[stable(feature = "sockaddr_setters", since = "1.9.0")]
 #[inline]
-pubfnset_flowinfo(&mutself,new_flowinfo:u32){
+#[stable(feature = "sockaddr_setters", since = "1.9.0")]
+#[rustc_const_unstable(feature = "const_sockaddr_setters", issue = "131714")]
+pubconstfnset_flowinfo(&mutself,new_flowinfo:u32){
 self.flowinfo = new_flowinfo;
 }
 
@@ -566,9 +573,10 @@ impl SocketAddrV6 {
 /// socket.set_scope_id(42);
 /// assert_eq!(socket.scope_id(), 42);
 /// ```
-#[stable(feature = "sockaddr_setters", since = "1.9.0")]
 #[inline]
-pubfnset_scope_id(&mutself,new_scope_id:u32){
+#[stable(feature = "sockaddr_setters", since = "1.9.0")]
+#[rustc_const_unstable(feature = "const_sockaddr_setters", issue = "131714")]
+pubconstfnset_scope_id(&mutself,new_scope_id:u32){
 self.scope_id = new_scope_id;
 }
 }