rollup merge of #21759: aturon/new-path

This PR implements [path reform](rust-lang/rfcs#474), and motivation and details for the change can be found there.

For convenience, the old path API is being kept as `old_path` for the time being. Updating after this PR is just a matter of changing imports to `old_path` (which is likely not needed, since the prelude entries still export the old path API).

This initial PR does not include additional normalization or platform-specific path extensions. These will be done in follow up commits or PRs.

[breaking-change]

Closes #20034
Closes #12056
Closes #11594
Closes #14028
Closes #14049
Closes #10035

Author: alexcrichton

src/libcore/error.rs

@@ -51,7 +51,7 @@
 //! use std::error::FromError;
 //! use std::old_io::{File, IoError};
 //! use std::os::{MemoryMap, MapError};
-//! use std::path::Path;
+//! use std::old_path::Path;
 //!
 //! enum MyError {
 //!     Io(IoError),

src/libgraphviz/maybe_owned_vec.rs

@@ -17,7 +17,7 @@ use std::cmp::Ordering;
 use std::default::Default;
 use std::fmt;
 use std::iter::FromIterator;
-use std::path::BytesContainer;
+use std::old_path::BytesContainer;
 use std::slice;
 
 // Note 1: It is not clear whether the flexibility of providing both

src/librustc_back/target/mod.rs

@@ -306,7 +306,7 @@ impl Target {
         use std::env;
         use std::ffi::OsString;
         use std::old_io::File;
-        use std::path::Path;
+        use std::old_path::Path;
         use serialize::json;
 
         fn load_file(path: &Path) -> Result<Target, String> {

src/librustc_trans/trans/debuginfo.rs

@@ -1590,7 +1590,7 @@ fn compile_unit_metadata(cx: &CrateContext) -> DIDescriptor {
                     Some(ref p) if p.is_relative() => {
                         // prepend "./" if necessary
                         let dotdot = b"..";
-                        let prefix: &[u8] = &[dotdot[0], ::std::path::SEP_BYTE];
+                        let prefix: &[u8] = &[dotdot[0], ::std::old_path::SEP_BYTE];
                         let mut path_bytes = p.as_vec().to_vec();
 
                         if &path_bytes[..2] != prefix &&

src/librustdoc/clean/mod.rs

@@ -49,7 +49,7 @@ use rustc::middle::stability;
 use std::rc::Rc;
 use std::u32;
 use std::str::Str as StrTrait; // Conflicts with Str variant
-use std::path::Path as FsPath; // Conflicts with Path struct
+use std::old_path::Path as FsPath; // Conflicts with Path struct
 
 use core::DocContext;
 use doctree;

src/libserialize/serialize.rs

@@ -14,7 +14,7 @@
 Core encoding and decoding interfaces.
 */
 
-use std::path;
+use std::old_path;
 use std::rc::Rc;
 use std::cell::{Cell, RefCell};
 use std::sync::Arc;
@@ -538,29 +538,29 @@ macro_rules! tuple {
 
 tuple! { T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, }
 
-impl Encodable for path::posix::Path {
+impl Encodable for old_path::posix::Path {
     fn encode<S: Encoder>(&self, e: &mut S) -> Result<(), S::Error> {
         self.as_vec().encode(e)
     }
 }
 
-impl Decodable for path::posix::Path {
-    fn decode<D: Decoder>(d: &mut D) -> Result<path::posix::Path, D::Error> {
+impl Decodable for old_path::posix::Path {
+    fn decode<D: Decoder>(d: &mut D) -> Result<old_path::posix::Path, D::Error> {
         let bytes: Vec<u8> = try!(Decodable::decode(d));
-        Ok(path::posix::Path::new(bytes))
+        Ok(old_path::posix::Path::new(bytes))
     }
 }
 
-impl Encodable for path::windows::Path {
+impl Encodable for old_path::windows::Path {
     fn encode<S: Encoder>(&self, e: &mut S) -> Result<(), S::Error> {
         self.as_vec().encode(e)
     }
 }
 
-impl Decodable for path::windows::Path {
-    fn decode<D: Decoder>(d: &mut D) -> Result<path::windows::Path, D::Error> {
+impl Decodable for old_path::windows::Path {
+    fn decode<D: Decoder>(d: &mut D) -> Result<old_path::windows::Path, D::Error> {
         let bytes: Vec<u8> = try!(Decodable::decode(d));
-        Ok(path::windows::Path::new(bytes))
+        Ok(old_path::windows::Path::new(bytes))
     }
 }
 

src/libstd/env.rs

@@ -57,7 +57,7 @@ pub fn current_dir() -> IoResult<Path> {
 ///
 /// ```rust
 /// use std::env;
-/// use std::path::Path;
+/// use std::old_path::Path;
 ///
 /// let root = Path::new("/");
 /// assert!(env::set_current_dir(&root).is_ok());

src/libstd/ffi/mod.rs

@@ -24,6 +24,7 @@ pub use self::os_str::OsStr;
 mod c_str;
 mod os_str;
 
+// FIXME (#21670): these should be defined in the os_str module
 /// Freely convertible to an `&OsStr` slice.
 pub trait AsOsStr {
     /// Convert to an `&OsStr` slice.

src/libstd/ffi/os_str.rs

@@ -41,7 +41,7 @@ use string::{String, CowString};
 use ops;
 use cmp;
 use hash::{Hash, Hasher, Writer};
-use path::{Path, GenericPath};
+use old_path::{Path, GenericPath};
 
 use sys::os_str::{Buf, Slice};
 use sys_common::{AsInner, IntoInner, FromInner};

src/libstd/lib.rs

@@ -251,6 +251,7 @@ pub mod old_io;
 pub mod os;
 pub mod env;
 pub mod path;
+pub mod old_path;
 pub mod rand;
 pub mod time;