std: Rename io/path features with old_ prefix

This commit renames the features for the `std::old_io` and `std::old_path`
modules to `old_io` and `old_path` to help facilitate migration to the new APIs.

This is a breaking change as crates which mention the old feature names now need
to be renamed to use the new feature names.

[breaking-change]

src/compiletest/compiletest.rs

@@ -13,8 +13,8 @@
 #![feature(box_syntax)]
 #![feature(collections)]
 #![feature(int_uint)]
-#![feature(io)]
-#![feature(path)]
+#![feature(old_io)]
+#![feature(old_path)]
 #![feature(rustc_private)]
 #![feature(unboxed_closures)]
 #![feature(std_misc)]

src/libgraphviz/lib.rs

@@ -276,7 +276,7 @@
 #![feature(int_uint)]
 #![feature(collections)]
 #![feature(core)]
-#![feature(io)]
+#![feature(old_io)]
 
 use self::LabelText::*;
 

src/liblog/lib.rs

@@ -171,7 +171,7 @@
 #![feature(box_syntax)]
 #![feature(int_uint)]
 #![feature(core)]
-#![feature(io)]
+#![feature(old_io)]
 #![feature(std_misc)]
 #![feature(env)]
 

src/librbml/lib.rs

@@ -28,7 +28,7 @@
 #![feature(collections)]
 #![feature(core)]
 #![feature(int_uint)]
-#![feature(io)]
+#![feature(old_io)]
 #![feature(rustc_private)]
 #![feature(staged_api)]
 

src/librustc/lib.rs

@@ -29,10 +29,10 @@
 #![feature(core)]
 #![feature(hash)]
 #![feature(int_uint)]
-#![feature(io)]
+#![feature(old_io)]
 #![feature(libc)]
 #![feature(env)]
-#![feature(path)]
+#![feature(old_path)]
 #![feature(quote)]
 #![feature(rustc_diagnostic_macros)]
 #![feature(rustc_private)]

src/librustc_back/lib.rs

@@ -35,9 +35,9 @@
 #![feature(core)]
 #![feature(hash)]
 #![feature(int_uint)]
-#![feature(io)]
+#![feature(old_io)]
 #![feature(os)]
-#![feature(path)]
+#![feature(old_path)]
 #![feature(rustc_private)]
 #![feature(staged_api)]
 #![feature(env)]

src/librustc_driver/lib.rs

@@ -28,10 +28,10 @@
 #![feature(core)]
 #![feature(env)]
 #![feature(int_uint)]
-#![feature(io)]
+#![feature(old_io)]
 #![feature(libc)]
 #![feature(os)]
-#![feature(path)]
+#![feature(old_path)]
 #![feature(quote)]
 #![feature(rustc_diagnostic_macros)]
 #![feature(rustc_private)]

src/librustc_llvm/lib.rs

@@ -29,7 +29,7 @@
 #![feature(int_uint)]
 #![feature(libc)]
 #![feature(link_args)]
-#![feature(path)]
+#![feature(old_path)]
 #![feature(staged_api)]
 #![feature(std_misc)]
 

src/librustc_trans/lib.rs

@@ -30,10 +30,10 @@
 #![feature(core)]
 #![feature(hash)]
 #![feature(int_uint)]
-#![feature(io)]
+#![feature(old_io)]
 #![feature(env)]
 #![feature(libc)]
-#![feature(path)]
+#![feature(old_path)]
 #![feature(quote)]
 #![feature(rustc_diagnostic_macros)]
 #![feature(rustc_private)]

src/librustdoc/lib.rs

@@ -25,10 +25,10 @@
 #![feature(env)]
 #![feature(hash)]
 #![feature(int_uint)]
-#![feature(io)]
+#![feature(old_io)]
 #![feature(libc)]
 #![feature(os)]
-#![feature(path)]
+#![feature(old_path)]
 #![feature(rustc_private)]
 #![feature(staged_api)]
 #![feature(std_misc)]

src/libserialize/lib.rs

@@ -29,8 +29,8 @@ Core encoding and decoding interfaces.
 #![feature(collections)]
 #![feature(core)]
 #![feature(int_uint)]
-#![feature(io)]
-#![feature(path)]
+#![feature(old_io)]
+#![feature(old_path)]
 #![feature(hash)]
 #![feature(rustc_private)]
 #![feature(staged_api)]

src/libstd/old_io/mod.rs

@@ -238,7 +238,7 @@
 //! concerned with error handling; instead its caller is responsible for
 //! responding to errors that may occur while attempting to read the numbers.
 
-#![unstable(feature = "io")]
+#![unstable(feature = "old_io")]
 #![deny(unused_must_use)]
 
 pub use self::SeekStyle::*;

src/libstd/old_path/mod.rs

@@ -59,7 +59,7 @@
 //! println!("path exists: {}", path.exists());
 //! ```
 
-#![unstable(feature = "path")]
+#![unstable(feature = "old_path")]
 
 use core::marker::Sized;
 use ffi::CString;

src/libsyntax/lib.rs

@@ -30,9 +30,9 @@
 #![feature(env)]
 #![feature(hash)]
 #![feature(int_uint)]
-#![feature(io)]
+#![feature(old_io)]
 #![feature(libc)]
-#![feature(path)]
+#![feature(old_path)]
 #![feature(quote, unsafe_destructor)]
 #![feature(rustc_private)]
 #![feature(staged_api)]

src/libterm/lib.rs

@@ -54,8 +54,8 @@
 #![feature(box_syntax)]
 #![feature(collections)]
 #![feature(int_uint)]
-#![feature(io)]
-#![feature(path)]
+#![feature(old_io)]
+#![feature(old_path)]
 #![feature(rustc_private)]
 #![feature(staged_api)]
 #![feature(std_misc)]

src/libtest/lib.rs

@@ -39,8 +39,8 @@
 #![feature(env)]
 #![feature(hash)]
 #![feature(int_uint)]
-#![feature(io)]
-#![feature(path)]
+#![feature(old_io)]
+#![feature(old_path)]
 #![feature(rustc_private)]
 #![feature(staged_api)]
 #![feature(std_misc)]

src/rustbook/main.rs

@@ -11,9 +11,9 @@
 #![feature(box_syntax)]
 #![feature(collections)]
 #![feature(core)]
-#![feature(io)]
+#![feature(old_io)]
 #![feature(os)]
-#![feature(path)]
+#![feature(old_path)]
 #![feature(rustdoc)]
 
 extern crate rustdoc;

src/test/compile-fail/lint-uppercase-variables.rs

@@ -12,12 +12,14 @@
 
 #![allow(dead_code)]
 #![deny(non_snake_case)]
-#![feature(path)]
-#![feature(io)]
 
 use std::old_io::File;
 use std::old_io::IoError;
 
+mod foo {
+    pub enum Foo { Foo }
+}
+
 struct Something {
     X: usize //~ ERROR structure field `X` should have a snake case name such as `x`
 }
@@ -30,13 +32,10 @@ fn main() {
     let Test: usize = 0; //~ ERROR variable `Test` should have a snake case name such as `test`
     println!("{}", Test);
 
-    let mut f = File::open(&Path::new("something.txt"));
-    let mut buff = [0u8; 16];
-    match f.read(&mut buff) {
-        Ok(cnt) => println!("read this many bytes: {}", cnt),
-        Err(IoError{ kind: EndOfFile, .. }) => println!("Got end of file: {:?}", EndOfFile),
-//~^ ERROR variable `EndOfFile` should have a snake case name such as `end_of_file`
-//~^^ WARN `EndOfFile` is named the same as one of the variants of the type `std::old_io::IoErrorKind`
+    match foo::Foo::Foo {
+        Foo => {}
+//~^ ERROR variable `Foo` should have a snake case name such as `foo`
+//~^^ WARN `Foo` is named the same as one of the variants of the type `foo::Foo`
     }
 
     test(1);