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-rw-r--r--src/libstd/old_io/net/udp.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstd/old_io/net/udp.rs b/src/libstd/old_io/net/udp.rs
index 97ef3da2f36..3aa811974b3 100644
--- a/src/libstd/old_io/net/udp.rs
+++ b/src/libstd/old_io/net/udp.rs
@@ -31,6 +31,7 @@ use sys_common;
 /// # Examples
 ///
 /// ```rust,no_run
+/// # #![feature(old_io)]
 /// # #![allow(unused_must_use)]
 ///
 /// use std::old_io::net::udp::UdpSocket;