Remove hidden `foo` functions from doc examples; use `Termination` trait.

Fixes https://github.com/rust-lang/rust/issues/49233.

3 files changed, 27 insertions, 27 deletions

diff --git a/src/libstd/net/mod.rs b/src/libstd/net/mod.rs
index eef043683b0..b0d5e563cb9 100644
--- a/src/libstd/net/mod.rs
+++ b/src/libstd/net/mod.rs
@@ -175,12 +175,12 @@ impl fmt::Debug for LookupHost {
 ///
 /// use std::net;
 ///
-/// # fn foo() -> std::io::Result<()> {
-/// for host in net::lookup_host("rust-lang.org")? {
-///     println!("found address: {}", host);
+/// fn main() -> std::io::Result<()> {
+///     for host in net::lookup_host("rust-lang.org")? {
+///         println!("found address: {}", host);
+///     }
+///     Ok(())
 /// }
-/// # Ok(())
-/// # }
 /// ```
 #[unstable(feature = "lookup_host", reason = "unsure about the returned \
                                               iterator and returning socket \
diff --git a/src/libstd/net/tcp.rs b/src/libstd/net/tcp.rs
index e28ccdb766a..0f60b5b3ee4 100644
--- a/src/libstd/net/tcp.rs
+++ b/src/libstd/net/tcp.rs
@@ -72,7 +72,7 @@ pub struct TcpStream(net_imp::TcpStream);
 ///
 /// # Examples
 ///
-/// ```
+/// ```no_run
 /// # use std::io;
 /// use std::net::{TcpListener, TcpStream};
 ///
@@ -80,15 +80,15 @@ pub struct TcpStream(net_imp::TcpStream);
 ///     // ...
 /// }
 ///
-/// # fn process() -> io::Result<()> {
-/// let listener = TcpListener::bind("127.0.0.1:80").unwrap();
+/// fn main() -> io::Result<()> {
+///     let listener = TcpListener::bind("127.0.0.1:80").unwrap();
 ///
-/// // accept connections and process them serially
-/// for stream in listener.incoming() {
-///     handle_client(stream?);
+///     // accept connections and process them serially
+///     for stream in listener.incoming() {
+///         handle_client(stream?);
+///     }
+///     Ok(())
 /// }
-/// # Ok(())
-/// # }
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct TcpListener(net_imp::TcpListener);
diff --git a/src/libstd/net/udp.rs b/src/libstd/net/udp.rs
index 8e56954bea4..d25e29999cb 100644
--- a/src/libstd/net/udp.rs
+++ b/src/libstd/net/udp.rs
@@ -44,22 +44,22 @@ use time::Duration;
 /// ```no_run
 /// use std::net::UdpSocket;
 ///
-/// # fn foo() -> std::io::Result<()> {
-/// {
-///     let mut socket = UdpSocket::bind("127.0.0.1:34254")?;
+/// fn main() -> std::io::Result<()> {
+///     {
+///         let mut socket = UdpSocket::bind("127.0.0.1:34254")?;
 ///
-///     // Receives a single datagram message on the socket. If `buf` is too small to hold
-///     // the message, it will be cut off.
-///     let mut buf = [0; 10];
-///     let (amt, src) = socket.recv_from(&mut buf)?;
+///         // Receives a single datagram message on the socket. If `buf` is too small to hold
+///         // the message, it will be cut off.
+///         let mut buf = [0; 10];
+///         let (amt, src) = socket.recv_from(&mut buf)?;
 ///
-///     // Redeclare `buf` as slice of the received data and send reverse data back to origin.
-///     let buf = &mut buf[..amt];
-///     buf.reverse();
-///     socket.send_to(buf, &src)?;
-///     # Ok(())
-/// } // the socket is closed here
-/// # }
+///         // Redeclare `buf` as slice of the received data and send reverse data back to origin.
+///         let buf = &mut buf[..amt];
+///         buf.reverse();
+///         socket.send_to(buf, &src)?;
+///     } // the socket is closed here
+///     Ok(())
+/// }
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct UdpSocket(net_imp::UdpSocket);