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-rw-r--r--src/libstd/old_io/net/ip.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstd/old_io/net/ip.rs b/src/libstd/old_io/net/ip.rs
index 077a5072570..f7953ac51b8 100644
--- a/src/libstd/old_io/net/ip.rs
+++ b/src/libstd/old_io/net/ip.rs
@@ -414,6 +414,7 @@ pub struct ParseError;
 /// Some examples:
 ///
 /// ```rust,no_run
+/// # #![feature(old_io, core)]
 /// # #![allow(unused_must_use)]
 ///
 /// use std::old_io::{TcpStream, TcpListener};