std: Deprecate std::old_io::fs

This commit deprecates the majority of std::old_io::fs in favor of std::fs and
its new functionality. Some functions remain non-deprecated but are now behind a
feature gate called `old_fs`. These functions will be deprecated once
suitable replacements have been implemented.

The compiler has been migrated to new `std::fs` and `std::path` APIs where
appropriate as part of this change.

src/test/compile-fail/empty-extern-arg.rs

@@ -9,6 +9,6 @@
 // except according to those terms.
 
 // compile-flags: --extern std=
-// error-pattern: is not a file
+// error-pattern: can't find crate for `std`
 
 fn main() {}

src/test/parse-fail/circular_modules_main.rs

@@ -9,10 +9,10 @@
 // except according to those terms.
 
 #[path = "circular_modules_hello.rs"]
-mod circular_modules_hello; //~ERROR: circular modules
+mod circular_modules_hello; //~ ERROR: circular modules
 
 pub fn hi_str() -> String {
-  "Hi!".to_string()
+    "Hi!".to_string()
 }
 
 fn main() {

src/test/parse-fail/issue-5806.rs

@@ -8,15 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
+// ignore-windows
+// ignore-freebsd
 
 #[path = "../compile-fail"]
 mod foo; //~ ERROR: a directory

src/test/run-make/issue-19371/foo.rs

@@ -18,6 +18,8 @@ use rustc::session::config::{basic_options, build_configuration, Input, OutputTy
 use rustc_driver::driver::{compile_input, CompileController};
 use syntax::diagnostics::registry::Registry;
 
+use std::path::PathBuf;
+
 fn main() {
     let src = r#"
     fn main() {}
@@ -29,9 +31,9 @@ fn main() {
         panic!("expected rustc path");
     }
 
-    let tmpdir = Path::new(&args[1]);
+    let tmpdir = PathBuf::new(&args[1]);
 
-    let mut sysroot = Path::new(&args[3]);
+    let mut sysroot = PathBuf::new(&args[3]);
     sysroot.pop();
     sysroot.pop();
 
@@ -40,7 +42,7 @@ fn main() {
     compile(src.to_string(), tmpdir.join("out"), sysroot.clone());
 }
 
-fn basic_sess(sysroot: Path) -> Session {
+fn basic_sess(sysroot: PathBuf) -> Session {
     let mut opts = basic_options();
     opts.output_types = vec![OutputTypeExe];
     opts.maybe_sysroot = Some(sysroot);
@@ -51,7 +53,7 @@ fn basic_sess(sysroot: Path) -> Session {
     sess
 }
 
-fn compile(code: String, output: Path, sysroot: Path) {
+fn compile(code: String, output: PathBuf, sysroot: PathBuf) {
     let sess = basic_sess(sysroot);
     let cfg = build_configuration(&sess);
     let control = CompileController::basic();

src/test/run-pass-fulldeps/compiler-calls.rs

@@ -25,6 +25,7 @@ use rustc::session::config::{self, Input};
 use rustc_driver::{driver, CompilerCalls, Compilation};
 use syntax::diagnostics;
 
+use std::path::PathBuf;
 
 struct TestCalls {
     count: u32
@@ -43,14 +44,15 @@ impl<'a> CompilerCalls<'a> for TestCalls {
                      _: &getopts::Matches,
                      _: &Session,
                      _: &Input,
-                     _: &Option<Path>,
-                     _: &Option<Path>)
+                     _: &Option<PathBuf>,
+                     _: &Option<PathBuf>)
                      -> Compilation {
         self.count *= 3;
         Compilation::Stop
     }
 
-    fn some_input(&mut self, input: Input, input_path: Option<Path>) -> (Input, Option<Path>) {
+    fn some_input(&mut self, input: Input, input_path: Option<PathBuf>)
+                  -> (Input, Option<PathBuf>) {
         self.count *= 5;
         (input, input_path)
     }
@@ -58,10 +60,10 @@ impl<'a> CompilerCalls<'a> for TestCalls {
     fn no_input(&mut self,
                 _: &getopts::Matches,
                 _: &config::Options,
-                _: &Option<Path>,
-                _: &Option<Path>,
+                _: &Option<PathBuf>,
+                _: &Option<PathBuf>,
                 _: &diagnostics::registry::Registry)
-                -> Option<(Input, Option<Path>)> {
+                -> Option<(Input, Option<PathBuf>)> {
         panic!("This shouldn't happen");
     }