Rollup merge of #67966 - popzxc:core-std-matches, r=Centril

Use matches macro in libcore and libstd

This PR replaces matches like

```rust
match var {
    value => true,
    _ => false,
}
```

with use of `matches!` macro.

r? @Centril

2 files changed, 4 insertions, 16 deletions

diff --git a/src/libstd/net/addr.rs b/src/libstd/net/addr.rs
index a9d88370c61..a59d7f0263b 100644
--- a/src/libstd/net/addr.rs
+++ b/src/libstd/net/addr.rs
@@ -227,10 +227,7 @@ impl SocketAddr {
     /// ```
     #[stable(feature = "sockaddr_checker", since = "1.16.0")]
     pub fn is_ipv4(&self) -> bool {
-        match *self {
-            SocketAddr::V4(_) => true,
-            SocketAddr::V6(_) => false,
-        }
+        matches!(*self, SocketAddr::V4(_))
     }
 
     /// Returns [`true`] if the [IP address] in this `SocketAddr` is an
@@ -252,10 +249,7 @@ impl SocketAddr {
     /// ```
     #[stable(feature = "sockaddr_checker", since = "1.16.0")]
     pub fn is_ipv6(&self) -> bool {
-        match *self {
-            SocketAddr::V4(_) => false,
-            SocketAddr::V6(_) => true,
-        }
+        matches!(*self, SocketAddr::V6(_))
     }
 }
 
diff --git a/src/libstd/net/ip.rs b/src/libstd/net/ip.rs
index 15d2361acd9..6410a4f2b65 100644
--- a/src/libstd/net/ip.rs
+++ b/src/libstd/net/ip.rs
@@ -281,10 +281,7 @@ impl IpAddr {
     /// ```
     #[stable(feature = "ipaddr_checker", since = "1.16.0")]
     pub fn is_ipv4(&self) -> bool {
-        match self {
-            IpAddr::V4(_) => true,
-            IpAddr::V6(_) => false,
-        }
+        matches!(self, IpAddr::V4(_))
     }
 
     /// Returns [`true`] if this address is an [IPv6 address], and [`false`] otherwise.
@@ -303,10 +300,7 @@ impl IpAddr {
     /// ```
     #[stable(feature = "ipaddr_checker", since = "1.16.0")]
     pub fn is_ipv6(&self) -> bool {
-        match self {
-            IpAddr::V4(_) => false,
-            IpAddr::V6(_) => true,
-        }
+        matches!(self, IpAddr::V6(_))
     }
 }