rollup merge of #24651: tamird/old-references

r? @alexcrichton

Author: alexcrichton

src/libcollections/fmt.rs

@@ -260,7 +260,6 @@
 //! Example usage is:
 //!
 //! ```
-//! # #![feature(old_io)]
 //! # #![allow(unused_must_use)]
 //! use std::io::Write;
 //! let mut w = Vec::new();
@@ -288,7 +287,6 @@
 //! off, some example usage is:
 //!
 //! ```
-//! # #![feature(old_io)]
 //! use std::fmt;
 //! use std::io::{self, Write};
 //!

src/libserialize/json.rs

@@ -2059,7 +2059,7 @@ impl<T: Iterator<Item=char>> Builder<T> {
     }
 }
 
-/// Decodes a json value from an `&mut old_io::Reader`
+/// Decodes a json value from an `&mut io::Read`
 pub fn from_reader(rdr: &mut Read) -> Result<Json, BuilderError> {
     let mut contents = Vec::new();
     match rdr.read_to_end(&mut contents) {

src/libstd/panicking.rs

@@ -19,7 +19,6 @@ use rt::{backtrace, unwind};
 use sys::stdio::Stderr;
 use thread;
 
-// Defined in this module instead of old_io::stdio so that the unwinding
 thread_local! {
     pub static LOCAL_STDERR: RefCell<Option<Box<Write + Send>>> = {
         RefCell::new(None)