We stdlib now

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diff --git a/ctr-std/src/path.rs b/ctr-std/src/path.rs
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+// Copyright 2015 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.
+
+//! Cross-platform path manipulation.
+//!
+//! This module provides two types, `PathBuf` and `Path` (akin to `String` and
+//! `str`), for working with paths abstractly. These types are thin wrappers
+//! around `OsString` and `OsStr` respectively, meaning that they work directly
+//! on strings according to the local platform's path syntax.
+//!
+//! ## Simple usage
+//!
+//! Path manipulation includes both parsing components from slices and building
+//! new owned paths.
+//!
+//! To parse a path, you can create a `Path` slice from a `str`
+//! slice and start asking questions:
+//!
+//! ```rust
+//! use std::path::Path;
+//!
+//! let path = Path::new("/tmp/foo/bar.txt");
+//! let file = path.file_name();
+//! let extension = path.extension();
+//! let parent_dir = path.parent();
+//! ```
+//!
+//! To build or modify paths, use `PathBuf`:
+//!
+//! ```rust
+//! use std::path::PathBuf;
+//!
+//! let mut path = PathBuf::from("c:\\");
+//! path.push("windows");
+//! path.push("system32");
+//! path.set_extension("dll");
+//! ```
+//!
+//! ## Path components and normalization
+//!
+//! The path APIs are built around the notion of "components", which roughly
+//! correspond to the substrings between path separators (`/` and, on Windows,
+//! `\`). The APIs for path parsing are largely specified in terms of the path's
+//! components, so it's important to clearly understand how those are
+//! determined.
+//!
+//! A path can always be reconstructed into an *equivalent* path by
+//! putting together its components via `push`. Syntactically, the
+//! paths may differ by the normalization described below.
+//!
+//! ### Component types
+//!
+//! Components come in several types:
+//!
+//! * Normal components are the default: standard references to files or
+//! directories. The path `a/b` has two normal components, `a` and `b`.
+//!
+//! * Current directory components represent the `.` character. For example,
+//! `./a` has a current directory component and a normal component `a`.
+//!
+//! * The root directory component represents a separator that designates
+//!   starting from root. For example, `/a/b` has a root directory component
+//!   followed by normal components `a` and `b`.
+//!
+//! On Windows, an additional component type comes into play:
+//!
+//! * Prefix components, of which there is a large variety. For example, `C:`
+//! and `\\server\share` are prefixes. The path `C:windows` has a prefix
+//! component `C:` and a normal component `windows`; the path `C:\windows` has a
+//! prefix component `C:`, a root directory component, and a normal component
+//! `windows`.
+//!
+//! ### Normalization
+//!
+//! Aside from splitting on the separator(s), there is a small amount of
+//! "normalization":
+//!
+//! * Repeated separators are ignored: `a/b` and `a//b` both have components `a`
+//!   and `b`.
+//!
+//! * Occurrences of `.` are normalized away, *except* if they are at
+//! the beginning of the path (in which case they are often meaningful
+//! in terms of path searching). So, for example, `a/./b`, `a/b/`,
+//! `/a/b/.` and `a/b` all have components `a` and `b`, but `./a/b`
+//! has a leading current directory component.
+//!
+//! No other normalization takes place by default. In particular,
+//! `a/c` and `a/b/../c` are distinct, to account for the possibility
+//! that `b` is a symbolic link (so its parent isn't `a`). Further
+//! normalization is possible to build on top of the components APIs,
+//! and will be included in this library in the near future.
+
+#![stable(feature = "rust1", since = "1.0.0")]
+
+use ascii::*;
+use borrow::{Borrow, Cow};
+use cmp;
+use error::Error;
+use fmt;
+//use fs;
+use hash::{Hash, Hasher};
+//use io;
+use iter::{self, FusedIterator};
+use mem;
+use ops::{self, Deref};
+
+use ffi::{OsStr, OsString};
+
+use sys::path::{is_sep_byte, is_verbatim_sep, MAIN_SEP_STR, parse_prefix};
+
+////////////////////////////////////////////////////////////////////////////////
+// GENERAL NOTES
+////////////////////////////////////////////////////////////////////////////////
+//
+// Parsing in this module is done by directly transmuting OsStr to [u8] slices,
+// taking advantage of the fact that OsStr always encodes ASCII characters
+// as-is.  Eventually, this transmutation should be replaced by direct uses of
+// OsStr APIs for parsing, but it will take a while for those to become
+// available.
+
+////////////////////////////////////////////////////////////////////////////////
+// Windows Prefixes
+////////////////////////////////////////////////////////////////////////////////
+
+/// Path prefixes (Windows only).
+///
+/// Windows uses a variety of path styles, including references to drive
+/// volumes (like `C:`), network shared folders (like `\\server\share`) and
+/// others. In addition, some path prefixes are "verbatim", in which case
+/// `/` is *not* treated as a separator and essentially no normalization is
+/// performed.
+#[derive(Copy, Clone, Debug, Hash, PartialOrd, Ord, PartialEq, Eq)]
+#[stable(feature = "rust1", since = "1.0.0")]
+pub enum Prefix<'a> {
+    /// Prefix `\\?\`, together with the given component immediately following it.
+    #[stable(feature = "rust1", since = "1.0.0")]
+    Verbatim(#[stable(feature = "rust1", since = "1.0.0")] &'a OsStr),
+
+    /// Prefix `\\?\UNC\`, with the "server" and "share" components following it.
+    #[stable(feature = "rust1", since = "1.0.0")]
+    VerbatimUNC(
+        #[stable(feature = "rust1", since = "1.0.0")] &'a OsStr,
+        #[stable(feature = "rust1", since = "1.0.0")] &'a OsStr,
+    ),
+
+    /// Prefix like `\\?\C:\`, for the given drive letter
+    #[stable(feature = "rust1", since = "1.0.0")]
+    VerbatimDisk(#[stable(feature = "rust1", since = "1.0.0")] u8),
+
+    /// Prefix `\\.\`, together with the given component immediately following it.
+    #[stable(feature = "rust1", since = "1.0.0")]
+    DeviceNS(#[stable(feature = "rust1", since = "1.0.0")] &'a OsStr),
+
+    /// Prefix `\\server\share`, with the given "server" and "share" components.
+    #[stable(feature = "rust1", since = "1.0.0")]
+    UNC(
+        #[stable(feature = "rust1", since = "1.0.0")] &'a OsStr,
+        #[stable(feature = "rust1", since = "1.0.0")] &'a OsStr,
+    ),
+
+    /// Prefix `C:` for the given disk drive.
+    #[stable(feature = "rust1", since = "1.0.0")]
+    Disk(#[stable(feature = "rust1", since = "1.0.0")] u8),
+}
+
+impl<'a> Prefix<'a> {
+    #[inline]
+    fn len(&self) -> usize {
+        use self::Prefix::*;
+        fn os_str_len(s: &OsStr) -> usize {
+            os_str_as_u8_slice(s).len()
+        }
+        match *self {
+            Verbatim(x) => 4 + os_str_len(x),
+            VerbatimUNC(x, y) => {
+                8 + os_str_len(x) +
+                if os_str_len(y) > 0 {
+                    1 + os_str_len(y)
+                } else {
+                    0
+                }
+            },
+            VerbatimDisk(_) => 6,
+            UNC(x, y) => {
+                2 + os_str_len(x) +
+                if os_str_len(y) > 0 {
+                    1 + os_str_len(y)
+                } else {
+                    0
+                }
+            },
+            DeviceNS(x) => 4 + os_str_len(x),
+            Disk(_) => 2,
+        }
+
+    }
+
+    /// Determines if the prefix is verbatim, i.e. begins with `\\?\`.
+    #[inline]
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn is_verbatim(&self) -> bool {
+        use self::Prefix::*;
+        match *self {
+            Verbatim(_) | VerbatimDisk(_) | VerbatimUNC(..) => true,
+            _ => false,
+        }
+    }
+
+    #[inline]
+    fn is_drive(&self) -> bool {
+        match *self {
+            Prefix::Disk(_) => true,
+            _ => false,
+        }
+    }
+
+    #[inline]
+    fn has_implicit_root(&self) -> bool {
+        !self.is_drive()
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Exposed parsing helpers
+////////////////////////////////////////////////////////////////////////////////
+
+/// Determines whether the character is one of the permitted path
+/// separators for the current platform.
+///
+/// # Examples
+///
+/// ```
+/// use std::path;
+///
+/// assert!(path::is_separator('/'));
+/// assert!(!path::is_separator('❤'));
+/// ```
+#[stable(feature = "rust1", since = "1.0.0")]
+pub fn is_separator(c: char) -> bool {
+    c.is_ascii() && is_sep_byte(c as u8)
+}
+
+/// The primary separator for the current platform
+#[stable(feature = "rust1", since = "1.0.0")]
+pub const MAIN_SEPARATOR: char = ::sys::path::MAIN_SEP;
+
+////////////////////////////////////////////////////////////////////////////////
+// Misc helpers
+////////////////////////////////////////////////////////////////////////////////
+
+// Iterate through `iter` while it matches `prefix`; return `None` if `prefix`
+// is not a prefix of `iter`, otherwise return `Some(iter_after_prefix)` giving
+// `iter` after having exhausted `prefix`.
+fn iter_after<A, I, J>(mut iter: I, mut prefix: J) -> Option<I>
+    where I: Iterator<Item = A> + Clone,
+          J: Iterator<Item = A>,
+          A: PartialEq
+{
+    loop {
+        let mut iter_next = iter.clone();
+        match (iter_next.next(), prefix.next()) {
+            (Some(ref x), Some(ref y)) if x == y => (),
+            (Some(_), Some(_)) => return None,
+            (Some(_), None) => return Some(iter),
+            (None, None) => return Some(iter),
+            (None, Some(_)) => return None,
+        }
+        iter = iter_next;
+    }
+}
+
+// See note at the top of this module to understand why these are used:
+fn os_str_as_u8_slice(s: &OsStr) -> &[u8] {
+    unsafe { mem::transmute(s) }
+}
+unsafe fn u8_slice_as_os_str(s: &[u8]) -> &OsStr {
+    mem::transmute(s)
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Cross-platform, iterator-independent parsing
+////////////////////////////////////////////////////////////////////////////////
+
+/// Says whether the first byte after the prefix is a separator.
+fn has_physical_root(s: &[u8], prefix: Option<Prefix>) -> bool {
+    let path = if let Some(p) = prefix {
+        &s[p.len()..]
+    } else {
+        s
+    };
+    !path.is_empty() && is_sep_byte(path[0])
+}
+
+// basic workhorse for splitting stem and extension
+fn split_file_at_dot(file: &OsStr) -> (Option<&OsStr>, Option<&OsStr>) {
+    unsafe {
+        if os_str_as_u8_slice(file) == b".." {
+            return (Some(file), None);
+        }
+
+        // The unsafety here stems from converting between &OsStr and &[u8]
+        // and back. This is safe to do because (1) we only look at ASCII
+        // contents of the encoding and (2) new &OsStr values are produced
+        // only from ASCII-bounded slices of existing &OsStr values.
+
+        let mut iter = os_str_as_u8_slice(file).rsplitn(2, |b| *b == b'.');
+        let after = iter.next();
+        let before = iter.next();
+        if before == Some(b"") {
+            (Some(file), None)
+        } else {
+            (before.map(|s| u8_slice_as_os_str(s)),
+             after.map(|s| u8_slice_as_os_str(s)))
+        }
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// The core iterators
+////////////////////////////////////////////////////////////////////////////////
+
+/// Component parsing works by a double-ended state machine; the cursors at the
+/// front and back of the path each keep track of what parts of the path have
+/// been consumed so far.
+///
+/// Going front to back, a path is made up of a prefix, a starting
+/// directory component, and a body (of normal components)
+#[derive(Copy, Clone, PartialEq, PartialOrd, Debug)]
+enum State {
+    Prefix = 0,         // c:
+    StartDir = 1,       // / or . or nothing
+    Body = 2,           // foo/bar/baz
+    Done = 3,
+}
+
+/// A Windows path prefix, e.g. `C:` or `\\server\share`.
+///
+/// Does not occur on Unix.
+#[stable(feature = "rust1", since = "1.0.0")]
+#[derive(Copy, Clone, Eq, Debug)]
+pub struct PrefixComponent<'a> {
+    /// The prefix as an unparsed `OsStr` slice.
+    raw: &'a OsStr,
+
+    /// The parsed prefix data.
+    parsed: Prefix<'a>,
+}
+
+impl<'a> PrefixComponent<'a> {
+    /// The parsed prefix data.
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn kind(&self) -> Prefix<'a> {
+        self.parsed
+    }
+
+    /// The raw `OsStr` slice for this prefix.
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn as_os_str(&self) -> &'a OsStr {
+        self.raw
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> cmp::PartialEq for PrefixComponent<'a> {
+    fn eq(&self, other: &PrefixComponent<'a>) -> bool {
+        cmp::PartialEq::eq(&self.parsed, &other.parsed)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> cmp::PartialOrd for PrefixComponent<'a> {
+    fn partial_cmp(&self, other: &PrefixComponent<'a>) -> Option<cmp::Ordering> {
+        cmp::PartialOrd::partial_cmp(&self.parsed, &other.parsed)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> cmp::Ord for PrefixComponent<'a> {
+    fn cmp(&self, other: &PrefixComponent<'a>) -> cmp::Ordering {
+        cmp::Ord::cmp(&self.parsed, &other.parsed)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> Hash for PrefixComponent<'a> {
+    fn hash<H: Hasher>(&self, h: &mut H) {
+        self.parsed.hash(h);
+    }
+}
+
+/// A single component of a path.
+///
+/// See the module documentation for an in-depth explanation of components and
+/// their role in the API.
+///
+/// This `enum` is created from iterating over the [`path::Components`]
+/// `struct`.
+///
+/// # Examples
+///
+/// ```rust
+/// use std::path::{Component, Path};
+///
+/// let path = Path::new("/tmp/foo/bar.txt");
+/// let components = path.components().collect::<Vec<_>>();
+/// assert_eq!(&components, &[
+///     Component::RootDir,
+///     Component::Normal("tmp".as_ref()),
+///     Component::Normal("foo".as_ref()),
+///     Component::Normal("bar.txt".as_ref()),
+/// ]);
+/// ```
+///
+/// [`path::Components`]: struct.Components.html
+#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
+#[stable(feature = "rust1", since = "1.0.0")]
+pub enum Component<'a> {
+    /// A Windows path prefix, e.g. `C:` or `\\server\share`.
+    ///
+    /// Does not occur on Unix.
+    #[stable(feature = "rust1", since = "1.0.0")]
+    Prefix(
+        #[stable(feature = "rust1", since = "1.0.0")] PrefixComponent<'a>
+    ),
+
+    /// The root directory component, appears after any prefix and before anything else
+    #[stable(feature = "rust1", since = "1.0.0")]
+    RootDir,
+
+    /// A reference to the current directory, i.e. `.`
+    #[stable(feature = "rust1", since = "1.0.0")]
+    CurDir,
+
+    /// A reference to the parent directory, i.e. `..`
+    #[stable(feature = "rust1", since = "1.0.0")]
+    ParentDir,
+
+    /// A normal component, i.e. `a` and `b` in `a/b`
+    #[stable(feature = "rust1", since = "1.0.0")]
+    Normal(#[stable(feature = "rust1", since = "1.0.0")] &'a OsStr),
+}
+
+impl<'a> Component<'a> {
+    /// Extracts the underlying `OsStr` slice
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn as_os_str(self) -> &'a OsStr {
+        match self {
+            Component::Prefix(p) => p.as_os_str(),
+            Component::RootDir => OsStr::new(MAIN_SEP_STR),
+            Component::CurDir => OsStr::new("."),
+            Component::ParentDir => OsStr::new(".."),
+            Component::Normal(path) => path,
+        }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> AsRef<OsStr> for Component<'a> {
+    fn as_ref(&self) -> &OsStr {
+        self.as_os_str()
+    }
+}
+
+/// The core iterator giving the components of a path.
+///
+/// See the module documentation for an in-depth explanation of components and
+/// their role in the API.
+///
+/// This `struct` is created by the [`path::Path::components`] method.
+///
+/// # Examples
+///
+/// ```
+/// use std::path::Path;
+///
+/// let path = Path::new("/tmp/foo/bar.txt");
+///
+/// for component in path.components() {
+///     println!("{:?}", component);
+/// }
+/// ```
+///
+/// [`path::Path::components`]: struct.Path.html#method.components
+#[derive(Clone)]
+#[stable(feature = "rust1", since = "1.0.0")]
+pub struct Components<'a> {
+    // The path left to parse components from
+    path: &'a [u8],
+
+    // The prefix as it was originally parsed, if any
+    prefix: Option<Prefix<'a>>,
+
+    // true if path *physically* has a root separator; for most Windows
+    // prefixes, it may have a "logical" rootseparator for the purposes of
+    // normalization, e.g.  \\server\share == \\server\share\.
+    has_physical_root: bool,
+
+    // The iterator is double-ended, and these two states keep track of what has
+    // been produced from either end
+    front: State,
+    back: State,
+}
+
+/// An iterator over the components of a path, as `OsStr` slices.
+#[derive(Clone)]
+#[stable(feature = "rust1", since = "1.0.0")]
+pub struct Iter<'a> {
+    inner: Components<'a>,
+}
+
+#[stable(feature = "path_components_debug", since = "1.13.0")]
+impl<'a> fmt::Debug for Components<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        struct DebugHelper<'a>(&'a Path);
+
+        impl<'a> fmt::Debug for DebugHelper<'a> {
+            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+                f.debug_list()
+                    .entries(self.0.components())
+                    .finish()
+            }
+        }
+
+        f.debug_tuple("Components")
+            .field(&DebugHelper(self.as_path()))
+            .finish()
+    }
+}
+
+impl<'a> Components<'a> {
+    // how long is the prefix, if any?
+    #[inline]
+    fn prefix_len(&self) -> usize {
+        self.prefix.as_ref().map(Prefix::len).unwrap_or(0)
+    }
+
+    #[inline]
+    fn prefix_verbatim(&self) -> bool {
+        self.prefix.as_ref().map(Prefix::is_verbatim).unwrap_or(false)
+    }
+
+    /// how much of the prefix is left from the point of view of iteration?
+    #[inline]
+    fn prefix_remaining(&self) -> usize {
+        if self.front == State::Prefix {
+            self.prefix_len()
+        } else {
+            0
+        }
+    }
+
+    // Given the iteration so far, how much of the pre-State::Body path is left?
+    #[inline]
+    fn len_before_body(&self) -> usize {
+        let root = if self.front <= State::StartDir && self.has_physical_root {
+            1
+        } else {
+            0
+        };
+        let cur_dir = if self.front <= State::StartDir && self.include_cur_dir() {
+            1
+        } else {
+            0
+        };
+        self.prefix_remaining() + root + cur_dir
+    }
+
+    // is the iteration complete?
+    #[inline]
+    fn finished(&self) -> bool {
+        self.front == State::Done || self.back == State::Done || self.front > self.back
+    }
+
+    #[inline]
+    fn is_sep_byte(&self, b: u8) -> bool {
+        if self.prefix_verbatim() {
+            is_verbatim_sep(b)
+        } else {
+            is_sep_byte(b)
+        }
+    }
+
+    /// Extracts a slice corresponding to the portion of the path remaining for iteration.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// let mut components = Path::new("/tmp/foo/bar.txt").components();
+    /// components.next();
+    /// components.next();
+    ///
+    /// assert_eq!(Path::new("foo/bar.txt"), components.as_path());
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn as_path(&self) -> &'a Path {
+        let mut comps = self.clone();
+        if comps.front == State::Body {
+            comps.trim_left();
+        }
+        if comps.back == State::Body {
+            comps.trim_right();
+        }
+        unsafe { Path::from_u8_slice(comps.path) }
+    }
+
+    /// Is the *original* path rooted?
+    fn has_root(&self) -> bool {
+        if self.has_physical_root {
+            return true;
+        }
+        if let Some(p) = self.prefix {
+            if p.has_implicit_root() {
+                return true;
+            }
+        }
+        false
+    }
+
+    /// Should the normalized path include a leading . ?
+    fn include_cur_dir(&self) -> bool {
+        if self.has_root() {
+            return false;
+        }
+        let mut iter = self.path[self.prefix_len()..].iter();
+        match (iter.next(), iter.next()) {
+            (Some(&b'.'), None) => true,
+            (Some(&b'.'), Some(&b)) => self.is_sep_byte(b),
+            _ => false,
+        }
+    }
+
+    // parse a given byte sequence into the corresponding path component
+    fn parse_single_component<'b>(&self, comp: &'b [u8]) -> Option<Component<'b>> {
+        match comp {
+            b"." if self.prefix_verbatim() => Some(Component::CurDir),
+            b"." => None, // . components are normalized away, except at
+                          // the beginning of a path, which is treated
+                          // separately via `include_cur_dir`
+            b".." => Some(Component::ParentDir),
+            b"" => None,
+            _ => Some(Component::Normal(unsafe { u8_slice_as_os_str(comp) })),
+        }
+    }
+
+    // parse a component from the left, saying how many bytes to consume to
+    // remove the component
+    fn parse_next_component(&self) -> (usize, Option<Component<'a>>) {
+        debug_assert!(self.front == State::Body);
+        let (extra, comp) = match self.path.iter().position(|b| self.is_sep_byte(*b)) {
+            None => (0, self.path),
+            Some(i) => (1, &self.path[..i]),
+        };
+        (comp.len() + extra, self.parse_single_component(comp))
+    }
+
+    // parse a component from the right, saying how many bytes to consume to
+    // remove the component
+    fn parse_next_component_back(&self) -> (usize, Option<Component<'a>>) {
+        debug_assert!(self.back == State::Body);
+        let start = self.len_before_body();
+        let (extra, comp) = match self.path[start..].iter().rposition(|b| self.is_sep_byte(*b)) {
+            None => (0, &self.path[start..]),
+            Some(i) => (1, &self.path[start + i + 1..]),
+        };
+        (comp.len() + extra, self.parse_single_component(comp))
+    }
+
+    // trim away repeated separators (i.e. empty components) on the left
+    fn trim_left(&mut self) {
+        while !self.path.is_empty() {
+            let (size, comp) = self.parse_next_component();
+            if comp.is_some() {
+                return;
+            } else {
+                self.path = &self.path[size..];
+            }
+        }
+    }
+
+    // trim away repeated separators (i.e. empty components) on the right
+    fn trim_right(&mut self) {
+        while self.path.len() > self.len_before_body() {
+            let (size, comp) = self.parse_next_component_back();
+            if comp.is_some() {
+                return;
+            } else {
+                self.path = &self.path[..self.path.len() - size];
+            }
+        }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> AsRef<Path> for Components<'a> {
+    fn as_ref(&self) -> &Path {
+        self.as_path()
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> AsRef<OsStr> for Components<'a> {
+    fn as_ref(&self) -> &OsStr {
+        self.as_path().as_os_str()
+    }
+}
+
+#[stable(feature = "path_iter_debug", since = "1.13.0")]
+impl<'a> fmt::Debug for Iter<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        struct DebugHelper<'a>(&'a Path);
+
+        impl<'a> fmt::Debug for DebugHelper<'a> {
+            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+                f.debug_list()
+                    .entries(self.0.iter())
+                    .finish()
+            }
+        }
+
+        f.debug_tuple("Iter")
+            .field(&DebugHelper(self.as_path()))
+            .finish()
+    }
+}
+
+impl<'a> Iter<'a> {
+    /// Extracts a slice corresponding to the portion of the path remaining for iteration.
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn as_path(&self) -> &'a Path {
+        self.inner.as_path()
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> AsRef<Path> for Iter<'a> {
+    fn as_ref(&self) -> &Path {
+        self.as_path()
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> AsRef<OsStr> for Iter<'a> {
+    fn as_ref(&self) -> &OsStr {
+        self.as_path().as_os_str()
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> Iterator for Iter<'a> {
+    type Item = &'a OsStr;
+
+    fn next(&mut self) -> Option<&'a OsStr> {
+        self.inner.next().map(Component::as_os_str)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> DoubleEndedIterator for Iter<'a> {
+    fn next_back(&mut self) -> Option<&'a OsStr> {
+        self.inner.next_back().map(Component::as_os_str)
+    }
+}
+
+#[unstable(feature = "fused", issue = "35602")]
+impl<'a> FusedIterator for Iter<'a> {}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> Iterator for Components<'a> {
+    type Item = Component<'a>;
+
+    fn next(&mut self) -> Option<Component<'a>> {
+        while !self.finished() {
+            match self.front {
+                State::Prefix if self.prefix_len() > 0 => {
+                    self.front = State::StartDir;
+                    debug_assert!(self.prefix_len() <= self.path.len());
+                    let raw = &self.path[..self.prefix_len()];
+                    self.path = &self.path[self.prefix_len()..];
+                    return Some(Component::Prefix(PrefixComponent {
+                        raw: unsafe { u8_slice_as_os_str(raw) },
+                        parsed: self.prefix.unwrap(),
+                    }));
+                }
+                State::Prefix => {
+                    self.front = State::StartDir;
+                }
+                State::StartDir => {
+                    self.front = State::Body;
+                    if self.has_physical_root {
+                        debug_assert!(!self.path.is_empty());
+                        self.path = &self.path[1..];
+                        return Some(Component::RootDir);
+                    } else if let Some(p) = self.prefix {
+                        if p.has_implicit_root() && !p.is_verbatim() {
+                            return Some(Component::RootDir);
+                        }
+                    } else if self.include_cur_dir() {
+                        debug_assert!(!self.path.is_empty());
+                        self.path = &self.path[1..];
+                        return Some(Component::CurDir);
+                    }
+                }
+                State::Body if !self.path.is_empty() => {
+                    let (size, comp) = self.parse_next_component();
+                    self.path = &self.path[size..];
+                    if comp.is_some() {
+                        return comp;
+                    }
+                }
+                State::Body => {
+                    self.front = State::Done;
+                }
+                State::Done => unreachable!(),
+            }
+        }
+        None
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> DoubleEndedIterator for Components<'a> {
+    fn next_back(&mut self) -> Option<Component<'a>> {
+        while !self.finished() {
+            match self.back {
+                State::Body if self.path.len() > self.len_before_body() => {
+                    let (size, comp) = self.parse_next_component_back();
+                    self.path = &self.path[..self.path.len() - size];
+                    if comp.is_some() {
+                        return comp;
+                    }
+                }
+                State::Body => {
+                    self.back = State::StartDir;
+                }
+                State::StartDir => {
+                    self.back = State::Prefix;
+                    if self.has_physical_root {
+                        self.path = &self.path[..self.path.len() - 1];
+                        return Some(Component::RootDir);
+                    } else if let Some(p) = self.prefix {
+                        if p.has_implicit_root() && !p.is_verbatim() {
+                            return Some(Component::RootDir);
+                        }
+                    } else if self.include_cur_dir() {
+                        self.path = &self.path[..self.path.len() - 1];
+                        return Some(Component::CurDir);
+                    }
+                }
+                State::Prefix if self.prefix_len() > 0 => {
+                    self.back = State::Done;
+                    return Some(Component::Prefix(PrefixComponent {
+                        raw: unsafe { u8_slice_as_os_str(self.path) },
+                        parsed: self.prefix.unwrap(),
+                    }));
+                }
+                State::Prefix => {
+                    self.back = State::Done;
+                    return None;
+                }
+                State::Done => unreachable!(),
+            }
+        }
+        None
+    }
+}
+
+#[unstable(feature = "fused", issue = "35602")]
+impl<'a> FusedIterator for Components<'a> {}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> cmp::PartialEq for Components<'a> {
+    fn eq(&self, other: &Components<'a>) -> bool {
+        Iterator::eq(self.clone(), other.clone())
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> cmp::Eq for Components<'a> {}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> cmp::PartialOrd for Components<'a> {
+    fn partial_cmp(&self, other: &Components<'a>) -> Option<cmp::Ordering> {
+        Iterator::partial_cmp(self.clone(), other.clone())
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> cmp::Ord for Components<'a> {
+    fn cmp(&self, other: &Components<'a>) -> cmp::Ordering {
+        Iterator::cmp(self.clone(), other.clone())
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Basic types and traits
+////////////////////////////////////////////////////////////////////////////////
+
+/// An owned, mutable path (akin to [`String`]).
+///
+/// This type provides methods like [`push`] and [`set_extension`] that mutate
+/// the path in place. It also implements [`Deref`] to [`Path`], meaning that
+/// all methods on [`Path`] slices are available on `PathBuf` values as well.
+///
+/// [`String`]: ../string/struct.String.html
+/// [`Path`]: struct.Path.html
+/// [`push`]: struct.PathBuf.html#method.push
+/// [`set_extension`]: struct.PathBuf.html#method.set_extension
+/// [`Deref`]: ../ops/trait.Deref.html
+///
+/// More details about the overall approach can be found in
+/// the module documentation.
+///
+/// # Examples
+///
+/// ```
+/// use std::path::PathBuf;
+///
+/// let mut path = PathBuf::from("c:\\");
+/// path.push("windows");
+/// path.push("system32");
+/// path.set_extension("dll");
+/// ```
+#[derive(Clone)]
+#[stable(feature = "rust1", since = "1.0.0")]
+pub struct PathBuf {
+    inner: OsString,
+}
+
+impl PathBuf {
+    fn as_mut_vec(&mut self) -> &mut Vec<u8> {
+        unsafe { &mut *(self as *mut PathBuf as *mut Vec<u8>) }
+    }
+
+    /// Allocates an empty `PathBuf`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::PathBuf;
+    ///
+    /// let path = PathBuf::new();
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn new() -> PathBuf {
+        PathBuf { inner: OsString::new() }
+    }
+
+    /// Coerces to a [`Path`] slice.
+    ///
+    /// [`Path`]: struct.Path.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::{Path, PathBuf};
+    ///
+    /// let p = PathBuf::from("/test");
+    /// assert_eq!(Path::new("/test"), p.as_path());
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn as_path(&self) -> &Path {
+        self
+    }
+
+    /// Extends `self` with `path`.
+    ///
+    /// If `path` is absolute, it replaces the current path.
+    ///
+    /// On Windows:
+    ///
+    /// * if `path` has a root but no prefix (e.g. `\windows`), it
+    ///   replaces everything except for the prefix (if any) of `self`.
+    /// * if `path` has a prefix but no root, it replaces `self`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::PathBuf;
+    ///
+    /// let mut path = PathBuf::new();
+    /// path.push("/tmp");
+    /// path.push("file.bk");
+    /// assert_eq!(path, PathBuf::from("/tmp/file.bk"));
+    ///
+    /// // Pushing an absolute path replaces the current path
+    /// path.push("/etc/passwd");
+    /// assert_eq!(path, PathBuf::from("/etc/passwd"));
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn push<P: AsRef<Path>>(&mut self, path: P) {
+        self._push(path.as_ref())
+    }
+
+    fn _push(&mut self, path: &Path) {
+        // in general, a separator is needed if the rightmost byte is not a separator
+        let mut need_sep = self.as_mut_vec().last().map(|c| !is_sep_byte(*c)).unwrap_or(false);
+
+        // in the special case of `C:` on Windows, do *not* add a separator
+        {
+            let comps = self.components();
+            if comps.prefix_len() > 0 && comps.prefix_len() == comps.path.len() &&
+               comps.prefix.unwrap().is_drive() {
+                need_sep = false
+            }
+        }
+
+        // absolute `path` replaces `self`
+        if path.is_absolute() || path.prefix().is_some() {
+            self.as_mut_vec().truncate(0);
+
+        // `path` has a root but no prefix, e.g. `\windows` (Windows only)
+        } else if path.has_root() {
+            let prefix_len = self.components().prefix_remaining();
+            self.as_mut_vec().truncate(prefix_len);
+
+        // `path` is a pure relative path
+        } else if need_sep {
+            self.inner.push(MAIN_SEP_STR);
+        }
+
+        self.inner.push(path);
+    }
+
+    /// Truncate `self` to [`self.parent()`].
+    ///
+    /// Returns false and does nothing if [`self.file_name()`] is `None`.
+    /// Otherwise, returns `true`.
+    ///
+    /// [`self.parent()`]: struct.PathBuf.html#method.parent
+    /// [`self.file_name()`]: struct.PathBuf.html#method.file_name
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::{Path, PathBuf};
+    ///
+    /// let mut p = PathBuf::from("/test/test.rs");
+    ///
+    /// p.pop();
+    /// assert_eq!(Path::new("/test"), p);
+    /// p.pop();
+    /// assert_eq!(Path::new("/"), p);
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn pop(&mut self) -> bool {
+        match self.parent().map(|p| p.as_u8_slice().len()) {
+            Some(len) => {
+                self.as_mut_vec().truncate(len);
+                true
+            }
+            None => false,
+        }
+    }
+
+    /// Updates [`self.file_name()`] to `file_name`.
+    ///
+    /// If [`self.file_name()`] was `None`, this is equivalent to pushing
+    /// `file_name`.
+    ///
+    /// [`self.file_name()`]: struct.PathBuf.html#method.file_name
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::PathBuf;
+    ///
+    /// let mut buf = PathBuf::from("/");
+    /// assert!(buf.file_name() == None);
+    /// buf.set_file_name("bar");
+    /// assert!(buf == PathBuf::from("/bar"));
+    /// assert!(buf.file_name().is_some());
+    /// buf.set_file_name("baz.txt");
+    /// assert!(buf == PathBuf::from("/baz.txt"));
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn set_file_name<S: AsRef<OsStr>>(&mut self, file_name: S) {
+        self._set_file_name(file_name.as_ref())
+    }
+
+    fn _set_file_name(&mut self, file_name: &OsStr) {
+        if self.file_name().is_some() {
+            let popped = self.pop();
+            debug_assert!(popped);
+        }
+        self.push(file_name);
+    }
+
+    /// Updates [`self.extension()`] to `extension`.
+    ///
+    /// If [`self.file_name()`] is `None`, does nothing and returns `false`.
+    ///
+    /// Otherwise, returns `true`; if [`self.extension()`] is `None`, the
+    /// extension is added; otherwise it is replaced.
+    ///
+    /// [`self.file_name()`]: struct.PathBuf.html#method.file_name
+    /// [`self.extension()`]: struct.PathBuf.html#method.extension
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::{Path, PathBuf};
+    ///
+    /// let mut p = PathBuf::from("/feel/the");
+    ///
+    /// p.set_extension("force");
+    /// assert_eq!(Path::new("/feel/the.force"), p.as_path());
+    ///
+    /// p.set_extension("dark_side");
+    /// assert_eq!(Path::new("/feel/the.dark_side"), p.as_path());
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn set_extension<S: AsRef<OsStr>>(&mut self, extension: S) -> bool {
+        self._set_extension(extension.as_ref())
+    }
+
+    fn _set_extension(&mut self, extension: &OsStr) -> bool {
+        if self.file_name().is_none() {
+            return false;
+        }
+
+        let mut stem = match self.file_stem() {
+            Some(stem) => stem.to_os_string(),
+            None => OsString::new(),
+        };
+
+        if !os_str_as_u8_slice(extension).is_empty() {
+            stem.push(".");
+            stem.push(extension);
+        }
+        self.set_file_name(&stem);
+
+        true
+    }
+
+    /// Consumes the `PathBuf`, yielding its internal [`OsString`] storage.
+    ///
+    /// [`OsString`]: ../ffi/struct.OsString.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::PathBuf;
+    ///
+    /// let p = PathBuf::from("/the/head");
+    /// let os_str = p.into_os_string();
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn into_os_string(self) -> OsString {
+        self.inner
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a, T: ?Sized + AsRef<OsStr>> From<&'a T> for PathBuf {
+    fn from(s: &'a T) -> PathBuf {
+        PathBuf::from(s.as_ref().to_os_string())
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl From<OsString> for PathBuf {
+    fn from(s: OsString) -> PathBuf {
+        PathBuf { inner: s }
+    }
+}
+
+#[stable(feature = "from_path_buf_for_os_string", since = "1.14.0")]
+impl From<PathBuf> for OsString {
+    fn from(path_buf : PathBuf) -> OsString {
+        path_buf.inner
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl From<String> for PathBuf {
+    fn from(s: String) -> PathBuf {
+        PathBuf::from(OsString::from(s))
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<P: AsRef<Path>> iter::FromIterator<P> for PathBuf {
+    fn from_iter<I: IntoIterator<Item = P>>(iter: I) -> PathBuf {
+        let mut buf = PathBuf::new();
+        buf.extend(iter);
+        buf
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<P: AsRef<Path>> iter::Extend<P> for PathBuf {
+    fn extend<I: IntoIterator<Item = P>>(&mut self, iter: I) {
+        for p in iter {
+            self.push(p.as_ref())
+        }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl fmt::Debug for PathBuf {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        fmt::Debug::fmt(&**self, formatter)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl ops::Deref for PathBuf {
+    type Target = Path;
+
+    fn deref(&self) -> &Path {
+        Path::new(&self.inner)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Borrow<Path> for PathBuf {
+    fn borrow(&self) -> &Path {
+        self.deref()
+    }
+}
+
+#[stable(feature = "cow_from_path", since = "1.6.0")]
+impl<'a> From<&'a Path> for Cow<'a, Path> {
+    #[inline]
+    fn from(s: &'a Path) -> Cow<'a, Path> {
+        Cow::Borrowed(s)
+    }
+}
+
+#[stable(feature = "cow_from_path", since = "1.6.0")]
+impl<'a> From<PathBuf> for Cow<'a, Path> {
+    #[inline]
+    fn from(s: PathBuf) -> Cow<'a, Path> {
+        Cow::Owned(s)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl ToOwned for Path {
+    type Owned = PathBuf;
+    fn to_owned(&self) -> PathBuf {
+        self.to_path_buf()
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl cmp::PartialEq for PathBuf {
+    fn eq(&self, other: &PathBuf) -> bool {
+        self.components() == other.components()
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Hash for PathBuf {
+    fn hash<H: Hasher>(&self, h: &mut H) {
+        self.as_path().hash(h)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl cmp::Eq for PathBuf {}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl cmp::PartialOrd for PathBuf {
+    fn partial_cmp(&self, other: &PathBuf) -> Option<cmp::Ordering> {
+        self.components().partial_cmp(other.components())
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl cmp::Ord for PathBuf {
+    fn cmp(&self, other: &PathBuf) -> cmp::Ordering {
+        self.components().cmp(other.components())
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl AsRef<OsStr> for PathBuf {
+    fn as_ref(&self) -> &OsStr {
+        &self.inner[..]
+    }
+}
+
+/// A slice of a path (akin to [`str`]).
+///
+/// This type supports a number of operations for inspecting a path, including
+/// breaking the path into its components (separated by `/` or `\`, depending on
+/// the platform), extracting the file name, determining whether the path is
+/// absolute, and so on.
+///
+/// This is an *unsized* type, meaning that it must always be used behind a
+/// pointer like `&` or [`Box`]. For an owned version of this type,
+/// see [`PathBuf`].
+///
+/// [`str`]: ../primitive.str.html
+/// [`Box`]: ../boxed/struct.Box.html
+/// [`PathBuf`]: struct.PathBuf.html
+///
+/// More details about the overall approach can be found in
+/// the module documentation.
+///
+/// # Examples
+///
+/// ```
+/// use std::path::Path;
+///
+/// let path = Path::new("/tmp/foo/bar.txt");
+/// let file = path.file_name();
+/// let extension = path.extension();
+/// let parent_dir = path.parent();
+/// ```
+///
+#[stable(feature = "rust1", since = "1.0.0")]
+pub struct Path {
+    inner: OsStr,
+}
+
+/// An error returned from the `Path::strip_prefix` method indicating that the
+/// prefix was not found in `self`.
+#[derive(Debug, Clone, PartialEq, Eq)]
+#[stable(since = "1.7.0", feature = "strip_prefix")]
+pub struct StripPrefixError(());
+
+impl Path {
+    // The following (private!) function allows construction of a path from a u8
+    // slice, which is only safe when it is known to follow the OsStr encoding.
+    unsafe fn from_u8_slice(s: &[u8]) -> &Path {
+        Path::new(u8_slice_as_os_str(s))
+    }
+    // The following (private!) function reveals the byte encoding used for OsStr.
+    fn as_u8_slice(&self) -> &[u8] {
+        os_str_as_u8_slice(&self.inner)
+    }
+
+    /// Directly wrap a string slice as a `Path` slice.
+    ///
+    /// This is a cost-free conversion.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// Path::new("foo.txt");
+    /// ```
+    ///
+    /// You can create `Path`s from `String`s, or even other `Path`s:
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// let string = String::from("foo.txt");
+    /// let from_string = Path::new(&string);
+    /// let from_path = Path::new(&from_string);
+    /// assert_eq!(from_string, from_path);
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn new<S: AsRef<OsStr> + ?Sized>(s: &S) -> &Path {
+        unsafe { mem::transmute(s.as_ref()) }
+    }
+
+    /// Yields the underlying [`OsStr`] slice.
+    ///
+    /// [`OsStr`]: ../ffi/struct.OsStr.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// let os_str = Path::new("foo.txt").as_os_str();
+    /// assert_eq!(os_str, std::ffi::OsStr::new("foo.txt"));
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn as_os_str(&self) -> &OsStr {
+        &self.inner
+    }
+
+    /// Yields a [`&str`] slice if the `Path` is valid unicode.
+    ///
+    /// This conversion may entail doing a check for UTF-8 validity.
+    ///
+    /// [`&str`]: ../primitive.str.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// let path_str = Path::new("foo.txt").to_str();
+    /// assert_eq!(path_str, Some("foo.txt"));
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn to_str(&self) -> Option<&str> {
+        self.inner.to_str()
+    }
+
+    /// Converts a `Path` to a [`Cow<str>`].
+    ///
+    /// Any non-Unicode sequences are replaced with U+FFFD REPLACEMENT CHARACTER.
+    ///
+    /// [`Cow<str>`]: ../borrow/enum.Cow.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// let path_str = Path::new("foo.txt").to_string_lossy();
+    /// assert_eq!(path_str, "foo.txt");
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn to_string_lossy(&self) -> Cow<str> {
+        self.inner.to_string_lossy()
+    }
+
+    /// Converts a `Path` to an owned [`PathBuf`].
+    ///
+    /// [`PathBuf`]: struct.PathBuf.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// let path_buf = Path::new("foo.txt").to_path_buf();
+    /// assert_eq!(path_buf, std::path::PathBuf::from("foo.txt"));
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn to_path_buf(&self) -> PathBuf {
+        PathBuf::from(self.inner.to_os_string())
+    }
+
+    /// A path is *absolute* if it is independent of the current directory.
+    ///
+    /// * On Unix, a path is absolute if it starts with the root, so
+    /// `is_absolute` and `has_root` are equivalent.
+    ///
+    /// * On Windows, a path is absolute if it has a prefix and starts with the
+    /// root: `c:\windows` is absolute, while `c:temp` and `\temp` are not.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// assert!(!Path::new("foo.txt").is_absolute());
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    #[allow(deprecated)]
+    pub fn is_absolute(&self) -> bool {
+        self.has_root() && (cfg!(unix) || self.prefix().is_some())
+    }
+
+    /// A path is *relative* if it is not absolute.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// assert!(Path::new("foo.txt").is_relative());
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn is_relative(&self) -> bool {
+        !self.is_absolute()
+    }
+
+    fn prefix(&self) -> Option<Prefix> {
+        self.components().prefix
+    }
+
+    /// A path has a root if the body of the path begins with the directory separator.
+    ///
+    /// * On Unix, a path has a root if it begins with `/`.
+    ///
+    /// * On Windows, a path has a root if it:
+    ///     * has no prefix and begins with a separator, e.g. `\\windows`
+    ///     * has a prefix followed by a separator, e.g. `c:\windows` but not `c:windows`
+    ///     * has any non-disk prefix, e.g. `\\server\share`
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// assert!(Path::new("/etc/passwd").has_root());
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn has_root(&self) -> bool {
+        self.components().has_root()
+    }
+
+    /// The path without its final component, if any.
+    ///
+    /// Returns `None` if the path terminates in a root or prefix.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// let path = Path::new("/foo/bar");
+    /// let parent = path.parent().unwrap();
+    /// assert_eq!(parent, Path::new("/foo"));
+    ///
+    /// let grand_parent = parent.parent().unwrap();
+    /// assert_eq!(grand_parent, Path::new("/"));
+    /// assert_eq!(grand_parent.parent(), None);
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn parent(&self) -> Option<&Path> {
+        let mut comps = self.components();
+        let comp = comps.next_back();
+        comp.and_then(|p| {
+            match p {
+                Component::Normal(_) |
+                Component::CurDir |
+                Component::ParentDir => Some(comps.as_path()),
+                _ => None,
+            }
+        })
+    }
+
+    /// The final component of the path, if it is a normal file.
+    ///
+    /// If the path terminates in `..`, `file_name` will return `None`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    /// use std::ffi::OsStr;
+    ///
+    /// let path = Path::new("foo.txt");
+    /// let os_str = OsStr::new("foo.txt");
+    ///
+    /// assert_eq!(Some(os_str), path.file_name());
+    /// ```
+    ///
+    /// # Other examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    /// use std::ffi::OsStr;
+    ///
+    /// assert_eq!(Some(OsStr::new("foo.txt")), Path::new("foo.txt/.").file_name());
+    /// assert_eq!(Some(OsStr::new("foo.txt")), Path::new("foo.txt/.//").file_name());
+    /// assert_eq!(None, Path::new("foo.txt/..").file_name());
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn file_name(&self) -> Option<&OsStr> {
+        self.components().next_back().and_then(|p| {
+            match p {
+                Component::Normal(p) => Some(p.as_ref()),
+                _ => None,
+            }
+        })
+    }
+
+    /// Returns a path that, when joined onto `base`, yields `self`.
+    ///
+    /// # Errors
+    ///
+    /// If `base` is not a prefix of `self` (i.e. `starts_with`
+    /// returns `false`), returns `Err`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// let path = Path::new("/test/haha/foo.txt");
+    ///
+    /// assert_eq!(path.strip_prefix("/test"), Ok(Path::new("haha/foo.txt")));
+    /// assert_eq!(path.strip_prefix("test").is_ok(), false);
+    /// assert_eq!(path.strip_prefix("/haha").is_ok(), false);
+    /// ```
+    #[stable(since = "1.7.0", feature = "path_strip_prefix")]
+    pub fn strip_prefix<'a, P: ?Sized>(&'a self, base: &'a P)
+                                       -> Result<&'a Path, StripPrefixError>
+        where P: AsRef<Path>
+    {
+        self._strip_prefix(base.as_ref())
+    }
+
+    fn _strip_prefix<'a>(&'a self, base: &'a Path)
+                         -> Result<&'a Path, StripPrefixError> {
+        iter_after(self.components(), base.components())
+            .map(|c| c.as_path())
+            .ok_or(StripPrefixError(()))
+    }
+
+    /// Determines whether `base` is a prefix of `self`.
+    ///
+    /// Only considers whole path components to match.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// let path = Path::new("/etc/passwd");
+    ///
+    /// assert!(path.starts_with("/etc"));
+    ///
+    /// assert!(!path.starts_with("/e"));
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn starts_with<P: AsRef<Path>>(&self, base: P) -> bool {
+        self._starts_with(base.as_ref())
+    }
+
+    fn _starts_with(&self, base: &Path) -> bool {
+        iter_after(self.components(), base.components()).is_some()
+    }
+
+    /// Determines whether `child` is a suffix of `self`.
+    ///
+    /// Only considers whole path components to match.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// let path = Path::new("/etc/passwd");
+    ///
+    /// assert!(path.ends_with("passwd"));
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn ends_with<P: AsRef<Path>>(&self, child: P) -> bool {
+        self._ends_with(child.as_ref())
+    }
+
+    fn _ends_with(&self, child: &Path) -> bool {
+        iter_after(self.components().rev(), child.components().rev()).is_some()
+    }
+
+    /// Extracts the stem (non-extension) portion of [`self.file_name()`].
+    ///
+    /// [`self.file_name()`]: struct.Path.html#method.file_name
+    ///
+    /// The stem is:
+    ///
+    /// * None, if there is no file name;
+    /// * The entire file name if there is no embedded `.`;
+    /// * The entire file name if the file name begins with `.` and has no other `.`s within;
+    /// * Otherwise, the portion of the file name before the final `.`
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// let path = Path::new("foo.rs");
+    ///
+    /// assert_eq!("foo", path.file_stem().unwrap());
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn file_stem(&self) -> Option<&OsStr> {
+        self.file_name().map(split_file_at_dot).and_then(|(before, after)| before.or(after))
+    }
+
+    /// Extracts the extension of [`self.file_name()`], if possible.
+    ///
+    /// [`self.file_name()`]: struct.Path.html#method.file_name
+    ///
+    /// The extension is:
+    ///
+    /// * None, if there is no file name;
+    /// * None, if there is no embedded `.`;
+    /// * None, if the file name begins with `.` and has no other `.`s within;
+    /// * Otherwise, the portion of the file name after the final `.`
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// let path = Path::new("foo.rs");
+    ///
+    /// assert_eq!("rs", path.extension().unwrap());
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn extension(&self) -> Option<&OsStr> {
+        self.file_name().map(split_file_at_dot).and_then(|(before, after)| before.and(after))
+    }
+
+    /// Creates an owned [`PathBuf`] with `path` adjoined to `self`.
+    ///
+    /// See [`PathBuf::push`] for more details on what it means to adjoin a path.
+    ///
+    /// [`PathBuf`]: struct.PathBuf.html
+    /// [`PathBuf::push`]: struct.PathBuf.html#method.push
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::{Path, PathBuf};
+    ///
+    /// assert_eq!(Path::new("/etc").join("passwd"), PathBuf::from("/etc/passwd"));
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn join<P: AsRef<Path>>(&self, path: P) -> PathBuf {
+        self._join(path.as_ref())
+    }
+
+    fn _join(&self, path: &Path) -> PathBuf {
+        let mut buf = self.to_path_buf();
+        buf.push(path);
+        buf
+    }
+
+    /// Creates an owned [`PathBuf`] like `self` but with the given file name.
+    ///
+    /// See [`PathBuf::set_file_name`] for more details.
+    ///
+    /// [`PathBuf`]: struct.PathBuf.html
+    /// [`PathBuf::set_file_name`]: struct.PathBuf.html#method.set_file_name
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::{Path, PathBuf};
+    ///
+    /// let path = Path::new("/tmp/foo.txt");
+    /// assert_eq!(path.with_file_name("bar.txt"), PathBuf::from("/tmp/bar.txt"));
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn with_file_name<S: AsRef<OsStr>>(&self, file_name: S) -> PathBuf {
+        self._with_file_name(file_name.as_ref())
+    }
+
+    fn _with_file_name(&self, file_name: &OsStr) -> PathBuf {
+        let mut buf = self.to_path_buf();
+        buf.set_file_name(file_name);
+        buf
+    }
+
+    /// Creates an owned [`PathBuf`] like `self` but with the given extension.
+    ///
+    /// See [`PathBuf::set_extension`] for more details.
+    ///
+    /// [`PathBuf`]: struct.PathBuf.html
+    /// [`PathBuf::set_extension`]: struct.PathBuf.html#method.set_extension
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::{Path, PathBuf};
+    ///
+    /// let path = Path::new("foo.rs");
+    /// assert_eq!(path.with_extension("txt"), PathBuf::from("foo.txt"));
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn with_extension<S: AsRef<OsStr>>(&self, extension: S) -> PathBuf {
+        self._with_extension(extension.as_ref())
+    }
+
+    fn _with_extension(&self, extension: &OsStr) -> PathBuf {
+        let mut buf = self.to_path_buf();
+        buf.set_extension(extension);
+        buf
+    }
+
+    /// Produce an iterator over the components of the path.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::{Path, Component};
+    /// use std::ffi::OsStr;
+    ///
+    /// let mut components = Path::new("/tmp/foo.txt").components();
+    ///
+    /// assert_eq!(components.next(), Some(Component::RootDir));
+    /// assert_eq!(components.next(), Some(Component::Normal(OsStr::new("tmp"))));
+    /// assert_eq!(components.next(), Some(Component::Normal(OsStr::new("foo.txt"))));
+    /// assert_eq!(components.next(), None)
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn components(&self) -> Components {
+        let prefix = parse_prefix(self.as_os_str());
+        Components {
+            path: self.as_u8_slice(),
+            prefix: prefix,
+            has_physical_root: has_physical_root(self.as_u8_slice(), prefix),
+            front: State::Prefix,
+            back: State::Body,
+        }
+    }
+
+    /// Produce an iterator over the path's components viewed as [`OsStr`] slices.
+    ///
+    /// [`OsStr`]: ../ffi/struct.OsStr.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::{self, Path};
+    /// use std::ffi::OsStr;
+    ///
+    /// let mut it = Path::new("/tmp/foo.txt").iter();
+    /// assert_eq!(it.next(), Some(OsStr::new(&path::MAIN_SEPARATOR.to_string())));
+    /// assert_eq!(it.next(), Some(OsStr::new("tmp")));
+    /// assert_eq!(it.next(), Some(OsStr::new("foo.txt")));
+    /// assert_eq!(it.next(), None)
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn iter(&self) -> Iter {
+        Iter { inner: self.components() }
+    }
+
+    /// Returns an object that implements [`Display`] for safely printing paths
+    /// that may contain non-Unicode data.
+    ///
+    /// [`Display`]: ../fmt/trait.Display.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::path::Path;
+    ///
+    /// let path = Path::new("/tmp/foo.rs");
+    ///
+    /// println!("{}", path.display());
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn display(&self) -> Display {
+        Display { path: self }
+    }
+
+
+    /// Query the file system to get information about a file, directory, etc.
+    ///
+    /// This function will traverse symbolic links to query information about the
+    /// destination file.
+    ///
+    /// This is an alias to [`fs::metadata`].
+    ///
+    /// [`fs::metadata`]: ../fs/fn.metadata.html
+    #[cfg(feature = "fs_not_implemented")]
+    pub fn metadata(&self) -> io::Result<fs::Metadata> {
+        fs::metadata(self)
+    }
+
+    /// Query the metadata about a file without following symlinks.
+    ///
+    /// This is an alias to [`fs::symlink_metadata`].
+    ///
+    /// [`fs::symlink_metadata`]: ../fs/fn.symlink_metadata.html
+    #[cfg(feature = "fs_not_implemented")]
+    pub fn symlink_metadata(&self) -> io::Result<fs::Metadata> {
+        fs::symlink_metadata(self)
+    }
+
+    /// Returns the canonical form of the path with all intermediate components
+    /// normalized and symbolic links resolved.
+    ///
+    /// This is an alias to [`fs::canonicalize`].
+    ///
+    /// [`fs::canonicalize`]: ../fs/fn.canonicalize.html
+    #[cfg(feature = "fs_not_implemented")]
+    pub fn canonicalize(&self) -> io::Result<PathBuf> {
+        fs::canonicalize(self)
+    }
+
+    /// Reads a symbolic link, returning the file that the link points to.
+    ///
+    /// This is an alias to [`fs::read_link`].
+    ///
+    /// [`fs::read_link`]: ../fs/fn.read_link.html
+    #[cfg(feature = "fs_not_implemented")]
+    pub fn read_link(&self) -> io::Result<PathBuf> {
+        fs::read_link(self)
+    }
+
+    /// Returns an iterator over the entries within a directory.
+    ///
+    /// The iterator will yield instances of [`io::Result`]`<`[`DirEntry`]`>`. New
+    /// errors may be encountered after an iterator is initially constructed.
+    ///
+    /// This is an alias to [`fs::read_dir`].
+    ///
+    /// [`io::Result`]: ../io/type.Result.html
+    /// [`DirEntry`]: ../fs/struct.DirEntry.html
+    /// [`fs::read_dir`]: ../fs/fn.read_dir.html
+     #[cfg(feature = "fs_not_implemented")]
+    pub fn read_dir(&self) -> io::Result<fs::ReadDir> {
+        fs::read_dir(self)
+    }
+
+    /// Returns whether the path points at an existing entity.
+    ///
+    /// This function will traverse symbolic links to query information about the
+    /// destination file. In case of broken symbolic links this will return `false`.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::path::Path;
+    /// assert_eq!(Path::new("does_not_exist.txt").exists(), false);
+    /// ```
+    #[cfg(feature = "fs_not_implemented")]
+    pub fn exists(&self) -> bool {
+        fs::metadata(self).is_ok()
+    }
+
+    /// Returns whether the path is pointing at a regular file.
+    ///
+    /// This function will traverse symbolic links to query information about the
+    /// destination file. In case of broken symbolic links this will return `false`.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::path::Path;
+    /// assert_eq!(Path::new("./is_a_directory/").is_file(), false);
+    /// assert_eq!(Path::new("a_file.txt").is_file(), true);
+    /// ```
+    #[cfg(feature = "fs_not_implemented")]
+    pub fn is_file(&self) -> bool {
+        fs::metadata(self).map(|m| m.is_file()).unwrap_or(false)
+    }
+
+    /// Returns whether the path is pointing at a directory.
+    ///
+    /// This function will traverse symbolic links to query information about the
+    /// destination file. In case of broken symbolic links this will return `false`.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::path::Path;
+    /// assert_eq!(Path::new("./is_a_directory/").is_dir(), true);
+    /// assert_eq!(Path::new("a_file.txt").is_dir(), false);
+    /// ```
+    #[cfg(feature = "fs_not_implemented")]
+    pub fn is_dir(&self) -> bool {
+        fs::metadata(self).map(|m| m.is_dir()).unwrap_or(false)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl AsRef<OsStr> for Path {
+    fn as_ref(&self) -> &OsStr {
+        &self.inner
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl fmt::Debug for Path {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        self.inner.fmt(formatter)
+    }
+}
+
+/// Helper struct for safely printing paths with `format!()` and `{}`
+#[stable(feature = "rust1", since = "1.0.0")]
+pub struct Display<'a> {
+    path: &'a Path,
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> fmt::Debug for Display<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Debug::fmt(&self.path.to_string_lossy(), f)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> fmt::Display for Display<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Display::fmt(&self.path.to_string_lossy(), f)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl cmp::PartialEq for Path {
+    fn eq(&self, other: &Path) -> bool {
+        self.components().eq(other.components())
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Hash for Path {
+    fn hash<H: Hasher>(&self, h: &mut H) {
+        for component in self.components() {
+            component.hash(h);
+        }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl cmp::Eq for Path {}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl cmp::PartialOrd for Path {
+    fn partial_cmp(&self, other: &Path) -> Option<cmp::Ordering> {
+        self.components().partial_cmp(other.components())
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl cmp::Ord for Path {
+    fn cmp(&self, other: &Path) -> cmp::Ordering {
+        self.components().cmp(other.components())
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl AsRef<Path> for Path {
+    fn as_ref(&self) -> &Path {
+        self
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl AsRef<Path> for OsStr {
+    fn as_ref(&self) -> &Path {
+        Path::new(self)
+    }
+}
+
+#[stable(feature = "cow_os_str_as_ref_path", since = "1.8.0")]
+impl<'a> AsRef<Path> for Cow<'a, OsStr> {
+    fn as_ref(&self) -> &Path {
+        Path::new(self)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl AsRef<Path> for OsString {
+    fn as_ref(&self) -> &Path {
+        Path::new(self)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl AsRef<Path> for str {
+    fn as_ref(&self) -> &Path {
+        Path::new(self)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl AsRef<Path> for String {
+    fn as_ref(&self) -> &Path {
+        Path::new(self)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl AsRef<Path> for PathBuf {
+    fn as_ref(&self) -> &Path {
+        self
+    }
+}
+
+#[stable(feature = "path_into_iter", since = "1.6.0")]
+impl<'a> IntoIterator for &'a PathBuf {
+    type Item = &'a OsStr;
+    type IntoIter = Iter<'a>;
+    fn into_iter(self) -> Iter<'a> { self.iter() }
+}
+
+#[stable(feature = "path_into_iter", since = "1.6.0")]
+impl<'a> IntoIterator for &'a Path {
+    type Item = &'a OsStr;
+    type IntoIter = Iter<'a>;
+    fn into_iter(self) -> Iter<'a> { self.iter() }
+}
+
+macro_rules! impl_cmp {
+    ($lhs:ty, $rhs: ty) => {
+        #[stable(feature = "partialeq_path", since = "1.6.0")]
+        impl<'a, 'b> PartialEq<$rhs> for $lhs {
+            #[inline]
+            fn eq(&self, other: &$rhs) -> bool { <Path as PartialEq>::eq(self, other) }
+        }
+
+        #[stable(feature = "partialeq_path", since = "1.6.0")]
+        impl<'a, 'b> PartialEq<$lhs> for $rhs {
+            #[inline]
+            fn eq(&self, other: &$lhs) -> bool { <Path as PartialEq>::eq(self, other) }
+        }
+
+        #[stable(feature = "cmp_path", since = "1.8.0")]
+        impl<'a, 'b> PartialOrd<$rhs> for $lhs {
+            #[inline]
+            fn partial_cmp(&self, other: &$rhs) -> Option<cmp::Ordering> {
+                <Path as PartialOrd>::partial_cmp(self, other)
+            }
+        }
+
+        #[stable(feature = "cmp_path", since = "1.8.0")]
+        impl<'a, 'b> PartialOrd<$lhs> for $rhs {
+            #[inline]
+            fn partial_cmp(&self, other: &$lhs) -> Option<cmp::Ordering> {
+                <Path as PartialOrd>::partial_cmp(self, other)
+            }
+        }
+    }
+}
+
+impl_cmp!(PathBuf, Path);
+impl_cmp!(PathBuf, &'a Path);
+impl_cmp!(Cow<'a, Path>, Path);
+impl_cmp!(Cow<'a, Path>, &'b Path);
+impl_cmp!(Cow<'a, Path>, PathBuf);
+
+macro_rules! impl_cmp_os_str {
+    ($lhs:ty, $rhs: ty) => {
+        #[stable(feature = "cmp_path", since = "1.8.0")]
+        impl<'a, 'b> PartialEq<$rhs> for $lhs {
+            #[inline]
+            fn eq(&self, other: &$rhs) -> bool { <Path as PartialEq>::eq(self, other.as_ref()) }
+        }
+
+        #[stable(feature = "cmp_path", since = "1.8.0")]
+        impl<'a, 'b> PartialEq<$lhs> for $rhs {
+            #[inline]
+            fn eq(&self, other: &$lhs) -> bool { <Path as PartialEq>::eq(self.as_ref(), other) }
+        }
+
+        #[stable(feature = "cmp_path", since = "1.8.0")]
+        impl<'a, 'b> PartialOrd<$rhs> for $lhs {
+            #[inline]
+            fn partial_cmp(&self, other: &$rhs) -> Option<cmp::Ordering> {
+                <Path as PartialOrd>::partial_cmp(self, other.as_ref())
+            }
+        }
+
+        #[stable(feature = "cmp_path", since = "1.8.0")]
+        impl<'a, 'b> PartialOrd<$lhs> for $rhs {
+            #[inline]
+            fn partial_cmp(&self, other: &$lhs) -> Option<cmp::Ordering> {
+                <Path as PartialOrd>::partial_cmp(self.as_ref(), other)
+            }
+        }
+    }
+}
+
+impl_cmp_os_str!(PathBuf, OsStr);
+impl_cmp_os_str!(PathBuf, &'a OsStr);
+impl_cmp_os_str!(PathBuf, Cow<'a, OsStr>);
+impl_cmp_os_str!(PathBuf, OsString);
+impl_cmp_os_str!(Path, OsStr);
+impl_cmp_os_str!(Path, &'a OsStr);
+impl_cmp_os_str!(Path, Cow<'a, OsStr>);
+impl_cmp_os_str!(Path, OsString);
+impl_cmp_os_str!(&'a Path, OsStr);
+impl_cmp_os_str!(&'a Path, Cow<'b, OsStr>);
+impl_cmp_os_str!(&'a Path, OsString);
+impl_cmp_os_str!(Cow<'a, Path>, OsStr);
+impl_cmp_os_str!(Cow<'a, Path>, &'b OsStr);
+impl_cmp_os_str!(Cow<'a, Path>, OsString);
+
+#[stable(since = "1.7.0", feature = "strip_prefix")]
+impl fmt::Display for StripPrefixError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        self.description().fmt(f)
+    }
+}
+
+#[stable(since = "1.7.0", feature = "strip_prefix")]
+impl Error for StripPrefixError {
+    fn description(&self) -> &str { "prefix not found" }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    macro_rules! t(
+        ($path:expr, iter: $iter:expr) => (
+            {
+                let path = Path::new($path);
+
+                // Forward iteration
+                let comps = path.iter()
+                    .map(|p| p.to_string_lossy().into_owned())
+                    .collect::<Vec<String>>();
+                let exp: &[&str] = &$iter;
+                let exps = exp.iter().map(|s| s.to_string()).collect::<Vec<String>>();
+                assert!(comps == exps, "iter: Expected {:?}, found {:?}",
+                        exps, comps);
+
+                // Reverse iteration
+                let comps = Path::new($path).iter().rev()
+                    .map(|p| p.to_string_lossy().into_owned())
+                    .collect::<Vec<String>>();
+                let exps = exps.into_iter().rev().collect::<Vec<String>>();
+                assert!(comps == exps, "iter().rev(): Expected {:?}, found {:?}",
+                        exps, comps);
+            }
+        );
+
+        ($path:expr, has_root: $has_root:expr, is_absolute: $is_absolute:expr) => (
+            {
+                let path = Path::new($path);
+
+                let act_root = path.has_root();
+                assert!(act_root == $has_root, "has_root: Expected {:?}, found {:?}",
+                        $has_root, act_root);
+
+                let act_abs = path.is_absolute();
+                assert!(act_abs == $is_absolute, "is_absolute: Expected {:?}, found {:?}",
+                        $is_absolute, act_abs);
+            }
+        );
+
+        ($path:expr, parent: $parent:expr, file_name: $file:expr) => (
+            {
+                let path = Path::new($path);
+
+                let parent = path.parent().map(|p| p.to_str().unwrap());
+                let exp_parent: Option<&str> = $parent;
+                assert!(parent == exp_parent, "parent: Expected {:?}, found {:?}",
+                        exp_parent, parent);
+
+                let file = path.file_name().map(|p| p.to_str().unwrap());
+                let exp_file: Option<&str> = $file;
+                assert!(file == exp_file, "file_name: Expected {:?}, found {:?}",
+                        exp_file, file);
+            }
+        );
+
+        ($path:expr, file_stem: $file_stem:expr, extension: $extension:expr) => (
+            {
+                let path = Path::new($path);
+
+                let stem = path.file_stem().map(|p| p.to_str().unwrap());
+                let exp_stem: Option<&str> = $file_stem;
+                assert!(stem == exp_stem, "file_stem: Expected {:?}, found {:?}",
+                        exp_stem, stem);
+
+                let ext = path.extension().map(|p| p.to_str().unwrap());
+                let exp_ext: Option<&str> = $extension;
+                assert!(ext == exp_ext, "extension: Expected {:?}, found {:?}",
+                        exp_ext, ext);
+            }
+        );
+
+        ($path:expr, iter: $iter:expr,
+                     has_root: $has_root:expr, is_absolute: $is_absolute:expr,
+                     parent: $parent:expr, file_name: $file:expr,
+                     file_stem: $file_stem:expr, extension: $extension:expr) => (
+            {
+                t!($path, iter: $iter);
+                t!($path, has_root: $has_root, is_absolute: $is_absolute);
+                t!($path, parent: $parent, file_name: $file);
+                t!($path, file_stem: $file_stem, extension: $extension);
+            }
+        );
+    );
+
+    #[test]
+    fn into() {
+        use borrow::Cow;
+
+        let static_path = Path::new("/home/foo");
+        let static_cow_path: Cow<'static, Path> = static_path.into();
+        let pathbuf = PathBuf::from("/home/foo");
+
+        {
+            let path: &Path = &pathbuf;
+            let borrowed_cow_path: Cow<Path> = path.into();
+
+            assert_eq!(static_cow_path, borrowed_cow_path);
+        }
+
+        let owned_cow_path: Cow<'static, Path> = pathbuf.into();
+
+        assert_eq!(static_cow_path, owned_cow_path);
+    }
+
+    #[test]
+    #[cfg(unix)]
+    pub fn test_decompositions_unix() {
+        t!("",
+           iter: [],
+           has_root: false,
+           is_absolute: false,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("foo",
+           iter: ["foo"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: Some("foo"),
+           file_stem: Some("foo"),
+           extension: None
+           );
+
+        t!("/",
+           iter: ["/"],
+           has_root: true,
+           is_absolute: true,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("/foo",
+           iter: ["/", "foo"],
+           has_root: true,
+           is_absolute: true,
+           parent: Some("/"),
+           file_name: Some("foo"),
+           file_stem: Some("foo"),
+           extension: None
+           );
+
+        t!("foo/",
+           iter: ["foo"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: Some("foo"),
+           file_stem: Some("foo"),
+           extension: None
+           );
+
+        t!("/foo/",
+           iter: ["/", "foo"],
+           has_root: true,
+           is_absolute: true,
+           parent: Some("/"),
+           file_name: Some("foo"),
+           file_stem: Some("foo"),
+           extension: None
+           );
+
+        t!("foo/bar",
+           iter: ["foo", "bar"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("foo"),
+           file_name: Some("bar"),
+           file_stem: Some("bar"),
+           extension: None
+           );
+
+        t!("/foo/bar",
+           iter: ["/", "foo", "bar"],
+           has_root: true,
+           is_absolute: true,
+           parent: Some("/foo"),
+           file_name: Some("bar"),
+           file_stem: Some("bar"),
+           extension: None
+           );
+
+        t!("///foo///",
+           iter: ["/", "foo"],
+           has_root: true,
+           is_absolute: true,
+           parent: Some("/"),
+           file_name: Some("foo"),
+           file_stem: Some("foo"),
+           extension: None
+           );
+
+        t!("///foo///bar",
+           iter: ["/", "foo", "bar"],
+           has_root: true,
+           is_absolute: true,
+           parent: Some("///foo"),
+           file_name: Some("bar"),
+           file_stem: Some("bar"),
+           extension: None
+           );
+
+        t!("./.",
+           iter: ["."],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("/..",
+           iter: ["/", ".."],
+           has_root: true,
+           is_absolute: true,
+           parent: Some("/"),
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("../",
+           iter: [".."],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("foo/.",
+           iter: ["foo"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: Some("foo"),
+           file_stem: Some("foo"),
+           extension: None
+           );
+
+        t!("foo/..",
+           iter: ["foo", ".."],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("foo"),
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("foo/./",
+           iter: ["foo"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: Some("foo"),
+           file_stem: Some("foo"),
+           extension: None
+           );
+
+        t!("foo/./bar",
+           iter: ["foo", "bar"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("foo"),
+           file_name: Some("bar"),
+           file_stem: Some("bar"),
+           extension: None
+           );
+
+        t!("foo/../",
+           iter: ["foo", ".."],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("foo"),
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("foo/../bar",
+           iter: ["foo", "..", "bar"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("foo/.."),
+           file_name: Some("bar"),
+           file_stem: Some("bar"),
+           extension: None
+           );
+
+        t!("./a",
+           iter: [".", "a"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("."),
+           file_name: Some("a"),
+           file_stem: Some("a"),
+           extension: None
+           );
+
+        t!(".",
+           iter: ["."],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("./",
+           iter: ["."],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("a/b",
+           iter: ["a", "b"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("a"),
+           file_name: Some("b"),
+           file_stem: Some("b"),
+           extension: None
+           );
+
+        t!("a//b",
+           iter: ["a", "b"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("a"),
+           file_name: Some("b"),
+           file_stem: Some("b"),
+           extension: None
+           );
+
+        t!("a/./b",
+           iter: ["a", "b"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("a"),
+           file_name: Some("b"),
+           file_stem: Some("b"),
+           extension: None
+           );
+
+        t!("a/b/c",
+           iter: ["a", "b", "c"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("a/b"),
+           file_name: Some("c"),
+           file_stem: Some("c"),
+           extension: None
+           );
+
+        t!(".foo",
+           iter: [".foo"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: Some(".foo"),
+           file_stem: Some(".foo"),
+           extension: None
+           );
+    }
+
+    #[test]
+    #[cfg(windows)]
+    pub fn test_decompositions_windows() {
+        t!("",
+           iter: [],
+           has_root: false,
+           is_absolute: false,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("foo",
+           iter: ["foo"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: Some("foo"),
+           file_stem: Some("foo"),
+           extension: None
+           );
+
+        t!("/",
+           iter: ["\\"],
+           has_root: true,
+           is_absolute: false,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("\\",
+           iter: ["\\"],
+           has_root: true,
+           is_absolute: false,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("c:",
+           iter: ["c:"],
+           has_root: false,
+           is_absolute: false,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("c:\\",
+           iter: ["c:", "\\"],
+           has_root: true,
+           is_absolute: true,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("c:/",
+           iter: ["c:", "\\"],
+           has_root: true,
+           is_absolute: true,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("/foo",
+           iter: ["\\", "foo"],
+           has_root: true,
+           is_absolute: false,
+           parent: Some("/"),
+           file_name: Some("foo"),
+           file_stem: Some("foo"),
+           extension: None
+           );
+
+        t!("foo/",
+           iter: ["foo"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: Some("foo"),
+           file_stem: Some("foo"),
+           extension: None
+           );
+
+        t!("/foo/",
+           iter: ["\\", "foo"],
+           has_root: true,
+           is_absolute: false,
+           parent: Some("/"),
+           file_name: Some("foo"),
+           file_stem: Some("foo"),
+           extension: None
+           );
+
+        t!("foo/bar",
+           iter: ["foo", "bar"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("foo"),
+           file_name: Some("bar"),
+           file_stem: Some("bar"),
+           extension: None
+           );
+
+        t!("/foo/bar",
+           iter: ["\\", "foo", "bar"],
+           has_root: true,
+           is_absolute: false,
+           parent: Some("/foo"),
+           file_name: Some("bar"),
+           file_stem: Some("bar"),
+           extension: None
+           );
+
+        t!("///foo///",
+           iter: ["\\", "foo"],
+           has_root: true,
+           is_absolute: false,
+           parent: Some("/"),
+           file_name: Some("foo"),
+           file_stem: Some("foo"),
+           extension: None
+           );
+
+        t!("///foo///bar",
+           iter: ["\\", "foo", "bar"],
+           has_root: true,
+           is_absolute: false,
+           parent: Some("///foo"),
+           file_name: Some("bar"),
+           file_stem: Some("bar"),
+           extension: None
+           );
+
+        t!("./.",
+           iter: ["."],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("/..",
+           iter: ["\\", ".."],
+           has_root: true,
+           is_absolute: false,
+           parent: Some("/"),
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("../",
+           iter: [".."],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("foo/.",
+           iter: ["foo"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: Some("foo"),
+           file_stem: Some("foo"),
+           extension: None
+           );
+
+        t!("foo/..",
+           iter: ["foo", ".."],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("foo"),
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("foo/./",
+           iter: ["foo"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: Some("foo"),
+           file_stem: Some("foo"),
+           extension: None
+           );
+
+        t!("foo/./bar",
+           iter: ["foo", "bar"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("foo"),
+           file_name: Some("bar"),
+           file_stem: Some("bar"),
+           extension: None
+           );
+
+        t!("foo/../",
+           iter: ["foo", ".."],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("foo"),
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("foo/../bar",
+           iter: ["foo", "..", "bar"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("foo/.."),
+           file_name: Some("bar"),
+           file_stem: Some("bar"),
+           extension: None
+           );
+
+        t!("./a",
+           iter: [".", "a"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("."),
+           file_name: Some("a"),
+           file_stem: Some("a"),
+           extension: None
+           );
+
+        t!(".",
+           iter: ["."],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("./",
+           iter: ["."],
+           has_root: false,
+           is_absolute: false,
+           parent: Some(""),
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("a/b",
+           iter: ["a", "b"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("a"),
+           file_name: Some("b"),
+           file_stem: Some("b"),
+           extension: None
+           );
+
+        t!("a//b",
+           iter: ["a", "b"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("a"),
+           file_name: Some("b"),
+           file_stem: Some("b"),
+           extension: None
+           );
+
+        t!("a/./b",
+           iter: ["a", "b"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("a"),
+           file_name: Some("b"),
+           file_stem: Some("b"),
+           extension: None
+           );
+
+        t!("a/b/c",
+           iter: ["a", "b", "c"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("a/b"),
+           file_name: Some("c"),
+           file_stem: Some("c"),
+           extension: None);
+
+        t!("a\\b\\c",
+           iter: ["a", "b", "c"],
+           has_root: false,
+           is_absolute: false,
+           parent: Some("a\\b"),
+           file_name: Some("c"),
+           file_stem: Some("c"),
+           extension: None
+           );
+
+        t!("\\a",
+           iter: ["\\", "a"],
+           has_root: true,
+           is_absolute: false,
+           parent: Some("\\"),
+           file_name: Some("a"),
+           file_stem: Some("a"),
+           extension: None
+           );
+
+        t!("c:\\foo.txt",
+           iter: ["c:", "\\", "foo.txt"],
+           has_root: true,
+           is_absolute: true,
+           parent: Some("c:\\"),
+           file_name: Some("foo.txt"),
+           file_stem: Some("foo"),
+           extension: Some("txt")
+           );
+
+        t!("\\\\server\\share\\foo.txt",
+           iter: ["\\\\server\\share", "\\", "foo.txt"],
+           has_root: true,
+           is_absolute: true,
+           parent: Some("\\\\server\\share\\"),
+           file_name: Some("foo.txt"),
+           file_stem: Some("foo"),
+           extension: Some("txt")
+           );
+
+        t!("\\\\server\\share",
+           iter: ["\\\\server\\share", "\\"],
+           has_root: true,
+           is_absolute: true,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("\\\\server",
+           iter: ["\\", "server"],
+           has_root: true,
+           is_absolute: false,
+           parent: Some("\\"),
+           file_name: Some("server"),
+           file_stem: Some("server"),
+           extension: None
+           );
+
+        t!("\\\\?\\bar\\foo.txt",
+           iter: ["\\\\?\\bar", "\\", "foo.txt"],
+           has_root: true,
+           is_absolute: true,
+           parent: Some("\\\\?\\bar\\"),
+           file_name: Some("foo.txt"),
+           file_stem: Some("foo"),
+           extension: Some("txt")
+           );
+
+        t!("\\\\?\\bar",
+           iter: ["\\\\?\\bar"],
+           has_root: true,
+           is_absolute: true,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("\\\\?\\",
+           iter: ["\\\\?\\"],
+           has_root: true,
+           is_absolute: true,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("\\\\?\\UNC\\server\\share\\foo.txt",
+           iter: ["\\\\?\\UNC\\server\\share", "\\", "foo.txt"],
+           has_root: true,
+           is_absolute: true,
+           parent: Some("\\\\?\\UNC\\server\\share\\"),
+           file_name: Some("foo.txt"),
+           file_stem: Some("foo"),
+           extension: Some("txt")
+           );
+
+        t!("\\\\?\\UNC\\server",
+           iter: ["\\\\?\\UNC\\server"],
+           has_root: true,
+           is_absolute: true,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("\\\\?\\UNC\\",
+           iter: ["\\\\?\\UNC\\"],
+           has_root: true,
+           is_absolute: true,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("\\\\?\\C:\\foo.txt",
+           iter: ["\\\\?\\C:", "\\", "foo.txt"],
+           has_root: true,
+           is_absolute: true,
+           parent: Some("\\\\?\\C:\\"),
+           file_name: Some("foo.txt"),
+           file_stem: Some("foo"),
+           extension: Some("txt")
+           );
+
+
+        t!("\\\\?\\C:\\",
+           iter: ["\\\\?\\C:", "\\"],
+           has_root: true,
+           is_absolute: true,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+
+        t!("\\\\?\\C:",
+           iter: ["\\\\?\\C:"],
+           has_root: true,
+           is_absolute: true,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+
+        t!("\\\\?\\foo/bar",
+           iter: ["\\\\?\\foo/bar"],
+           has_root: true,
+           is_absolute: true,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+
+        t!("\\\\?\\C:/foo",
+           iter: ["\\\\?\\C:/foo"],
+           has_root: true,
+           is_absolute: true,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+
+        t!("\\\\.\\foo\\bar",
+           iter: ["\\\\.\\foo", "\\", "bar"],
+           has_root: true,
+           is_absolute: true,
+           parent: Some("\\\\.\\foo\\"),
+           file_name: Some("bar"),
+           file_stem: Some("bar"),
+           extension: None
+           );
+
+
+        t!("\\\\.\\foo",
+           iter: ["\\\\.\\foo", "\\"],
+           has_root: true,
+           is_absolute: true,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+
+        t!("\\\\.\\foo/bar",
+           iter: ["\\\\.\\foo/bar", "\\"],
+           has_root: true,
+           is_absolute: true,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+
+        t!("\\\\.\\foo\\bar/baz",
+           iter: ["\\\\.\\foo", "\\", "bar", "baz"],
+           has_root: true,
+           is_absolute: true,
+           parent: Some("\\\\.\\foo\\bar"),
+           file_name: Some("baz"),
+           file_stem: Some("baz"),
+           extension: None
+           );
+
+
+        t!("\\\\.\\",
+           iter: ["\\\\.\\", "\\"],
+           has_root: true,
+           is_absolute: true,
+           parent: None,
+           file_name: None,
+           file_stem: None,
+           extension: None
+           );
+
+        t!("\\\\?\\a\\b\\",
+           iter: ["\\\\?\\a", "\\", "b"],
+           has_root: true,
+           is_absolute: true,
+           parent: Some("\\\\?\\a\\"),
+           file_name: Some("b"),
+           file_stem: Some("b"),
+           extension: None
+           );
+    }
+
+    #[test]
+    pub fn test_stem_ext() {
+        t!("foo",
+           file_stem: Some("foo"),
+           extension: None
+           );
+
+        t!("foo.",
+           file_stem: Some("foo"),
+           extension: Some("")
+           );
+
+        t!(".foo",
+           file_stem: Some(".foo"),
+           extension: None
+           );
+
+        t!("foo.txt",
+           file_stem: Some("foo"),
+           extension: Some("txt")
+           );
+
+        t!("foo.bar.txt",
+           file_stem: Some("foo.bar"),
+           extension: Some("txt")
+           );
+
+        t!("foo.bar.",
+           file_stem: Some("foo.bar"),
+           extension: Some("")
+           );
+
+        t!(".",
+           file_stem: None,
+           extension: None
+           );
+
+        t!("..",
+           file_stem: None,
+           extension: None
+           );
+
+        t!("",
+           file_stem: None,
+           extension: None
+           );
+    }
+
+    #[test]
+    pub fn test_push() {
+        macro_rules! tp(
+            ($path:expr, $push:expr, $expected:expr) => ( {
+                let mut actual = PathBuf::from($path);
+                actual.push($push);
+                assert!(actual.to_str() == Some($expected),
+                        "pushing {:?} onto {:?}: Expected {:?}, got {:?}",
+                        $push, $path, $expected, actual.to_str().unwrap());
+            });
+        );
+
+        if cfg!(unix) {
+            tp!("", "foo", "foo");
+            tp!("foo", "bar", "foo/bar");
+            tp!("foo/", "bar", "foo/bar");
+            tp!("foo//", "bar", "foo//bar");
+            tp!("foo/.", "bar", "foo/./bar");
+            tp!("foo./.", "bar", "foo././bar");
+            tp!("foo", "", "foo/");
+            tp!("foo", ".", "foo/.");
+            tp!("foo", "..", "foo/..");
+            tp!("foo", "/", "/");
+            tp!("/foo/bar", "/", "/");
+            tp!("/foo/bar", "/baz", "/baz");
+            tp!("/foo/bar", "./baz", "/foo/bar/./baz");
+        } else {
+            tp!("", "foo", "foo");
+            tp!("foo", "bar", r"foo\bar");
+            tp!("foo/", "bar", r"foo/bar");
+            tp!(r"foo\", "bar", r"foo\bar");
+            tp!("foo//", "bar", r"foo//bar");
+            tp!(r"foo\\", "bar", r"foo\\bar");
+            tp!("foo/.", "bar", r"foo/.\bar");
+            tp!("foo./.", "bar", r"foo./.\bar");
+            tp!(r"foo\.", "bar", r"foo\.\bar");
+            tp!(r"foo.\.", "bar", r"foo.\.\bar");
+            tp!("foo", "", "foo\\");
+            tp!("foo", ".", r"foo\.");
+            tp!("foo", "..", r"foo\..");
+            tp!("foo", "/", "/");
+            tp!("foo", r"\", r"\");
+            tp!("/foo/bar", "/", "/");
+            tp!(r"\foo\bar", r"\", r"\");
+            tp!("/foo/bar", "/baz", "/baz");
+            tp!("/foo/bar", r"\baz", r"\baz");
+            tp!("/foo/bar", "./baz", r"/foo/bar\./baz");
+            tp!("/foo/bar", r".\baz", r"/foo/bar\.\baz");
+
+            tp!("c:\\", "windows", "c:\\windows");
+            tp!("c:", "windows", "c:windows");
+
+            tp!("a\\b\\c", "d", "a\\b\\c\\d");
+            tp!("\\a\\b\\c", "d", "\\a\\b\\c\\d");
+            tp!("a\\b", "c\\d", "a\\b\\c\\d");
+            tp!("a\\b", "\\c\\d", "\\c\\d");
+            tp!("a\\b", ".", "a\\b\\.");
+            tp!("a\\b", "..\\c", "a\\b\\..\\c");
+            tp!("a\\b", "C:a.txt", "C:a.txt");
+            tp!("a\\b", "C:\\a.txt", "C:\\a.txt");
+            tp!("C:\\a", "C:\\b.txt", "C:\\b.txt");
+            tp!("C:\\a\\b\\c", "C:d", "C:d");
+            tp!("C:a\\b\\c", "C:d", "C:d");
+            tp!("C:", r"a\b\c", r"C:a\b\c");
+            tp!("C:", r"..\a", r"C:..\a");
+            tp!("\\\\server\\share\\foo",
+                "bar",
+                "\\\\server\\share\\foo\\bar");
+            tp!("\\\\server\\share\\foo", "C:baz", "C:baz");
+            tp!("\\\\?\\C:\\a\\b", "C:c\\d", "C:c\\d");
+            tp!("\\\\?\\C:a\\b", "C:c\\d", "C:c\\d");
+            tp!("\\\\?\\C:\\a\\b", "C:\\c\\d", "C:\\c\\d");
+            tp!("\\\\?\\foo\\bar", "baz", "\\\\?\\foo\\bar\\baz");
+            tp!("\\\\?\\UNC\\server\\share\\foo",
+                "bar",
+                "\\\\?\\UNC\\server\\share\\foo\\bar");
+            tp!("\\\\?\\UNC\\server\\share", "C:\\a", "C:\\a");
+            tp!("\\\\?\\UNC\\server\\share", "C:a", "C:a");
+
+            // Note: modified from old path API
+            tp!("\\\\?\\UNC\\server", "foo", "\\\\?\\UNC\\server\\foo");
+
+            tp!("C:\\a",
+                "\\\\?\\UNC\\server\\share",
+                "\\\\?\\UNC\\server\\share");
+            tp!("\\\\.\\foo\\bar", "baz", "\\\\.\\foo\\bar\\baz");
+            tp!("\\\\.\\foo\\bar", "C:a", "C:a");
+            // again, not sure about the following, but I'm assuming \\.\ should be verbatim
+            tp!("\\\\.\\foo", "..\\bar", "\\\\.\\foo\\..\\bar");
+
+            tp!("\\\\?\\C:", "foo", "\\\\?\\C:\\foo"); // this is a weird one
+        }
+    }
+
+    #[test]
+    pub fn test_pop() {
+        macro_rules! tp(
+            ($path:expr, $expected:expr, $output:expr) => ( {
+                let mut actual = PathBuf::from($path);
+                let output = actual.pop();
+                assert!(actual.to_str() == Some($expected) && output == $output,
+                        "popping from {:?}: Expected {:?}/{:?}, got {:?}/{:?}",
+                        $path, $expected, $output,
+                        actual.to_str().unwrap(), output);
+            });
+        );
+
+        tp!("", "", false);
+        tp!("/", "/", false);
+        tp!("foo", "", true);
+        tp!(".", "", true);
+        tp!("/foo", "/", true);
+        tp!("/foo/bar", "/foo", true);
+        tp!("foo/bar", "foo", true);
+        tp!("foo/.", "", true);
+        tp!("foo//bar", "foo", true);
+
+        if cfg!(windows) {
+            tp!("a\\b\\c", "a\\b", true);
+            tp!("\\a", "\\", true);
+            tp!("\\", "\\", false);
+
+            tp!("C:\\a\\b", "C:\\a", true);
+            tp!("C:\\a", "C:\\", true);
+            tp!("C:\\", "C:\\", false);
+            tp!("C:a\\b", "C:a", true);
+            tp!("C:a", "C:", true);
+            tp!("C:", "C:", false);
+            tp!("\\\\server\\share\\a\\b", "\\\\server\\share\\a", true);
+            tp!("\\\\server\\share\\a", "\\\\server\\share\\", true);
+            tp!("\\\\server\\share", "\\\\server\\share", false);
+            tp!("\\\\?\\a\\b\\c", "\\\\?\\a\\b", true);
+            tp!("\\\\?\\a\\b", "\\\\?\\a\\", true);
+            tp!("\\\\?\\a", "\\\\?\\a", false);
+            tp!("\\\\?\\C:\\a\\b", "\\\\?\\C:\\a", true);
+            tp!("\\\\?\\C:\\a", "\\\\?\\C:\\", true);
+            tp!("\\\\?\\C:\\", "\\\\?\\C:\\", false);
+            tp!("\\\\?\\UNC\\server\\share\\a\\b",
+                "\\\\?\\UNC\\server\\share\\a",
+                true);
+            tp!("\\\\?\\UNC\\server\\share\\a",
+                "\\\\?\\UNC\\server\\share\\",
+                true);
+            tp!("\\\\?\\UNC\\server\\share",
+                "\\\\?\\UNC\\server\\share",
+                false);
+            tp!("\\\\.\\a\\b\\c", "\\\\.\\a\\b", true);
+            tp!("\\\\.\\a\\b", "\\\\.\\a\\", true);
+            tp!("\\\\.\\a", "\\\\.\\a", false);
+
+            tp!("\\\\?\\a\\b\\", "\\\\?\\a\\", true);
+        }
+    }
+
+    #[test]
+    pub fn test_set_file_name() {
+        macro_rules! tfn(
+                ($path:expr, $file:expr, $expected:expr) => ( {
+                let mut p = PathBuf::from($path);
+                p.set_file_name($file);
+                assert!(p.to_str() == Some($expected),
+                        "setting file name of {:?} to {:?}: Expected {:?}, got {:?}",
+                        $path, $file, $expected,
+                        p.to_str().unwrap());
+            });
+        );
+
+        tfn!("foo", "foo", "foo");
+        tfn!("foo", "bar", "bar");
+        tfn!("foo", "", "");
+        tfn!("", "foo", "foo");
+        if cfg!(unix) {
+            tfn!(".", "foo", "./foo");
+            tfn!("foo/", "bar", "bar");
+            tfn!("foo/.", "bar", "bar");
+            tfn!("..", "foo", "../foo");
+            tfn!("foo/..", "bar", "foo/../bar");
+            tfn!("/", "foo", "/foo");
+        } else {
+            tfn!(".", "foo", r".\foo");
+            tfn!(r"foo\", "bar", r"bar");
+            tfn!(r"foo\.", "bar", r"bar");
+            tfn!("..", "foo", r"..\foo");
+            tfn!(r"foo\..", "bar", r"foo\..\bar");
+            tfn!(r"\", "foo", r"\foo");
+        }
+    }
+
+    #[test]
+    pub fn test_set_extension() {
+        macro_rules! tfe(
+                ($path:expr, $ext:expr, $expected:expr, $output:expr) => ( {
+                let mut p = PathBuf::from($path);
+                let output = p.set_extension($ext);
+                assert!(p.to_str() == Some($expected) && output == $output,
+                        "setting extension of {:?} to {:?}: Expected {:?}/{:?}, got {:?}/{:?}",
+                        $path, $ext, $expected, $output,
+                        p.to_str().unwrap(), output);
+            });
+        );
+
+        tfe!("foo", "txt", "foo.txt", true);
+        tfe!("foo.bar", "txt", "foo.txt", true);
+        tfe!("foo.bar.baz", "txt", "foo.bar.txt", true);
+        tfe!(".test", "txt", ".test.txt", true);
+        tfe!("foo.txt", "", "foo", true);
+        tfe!("foo", "", "foo", true);
+        tfe!("", "foo", "", false);
+        tfe!(".", "foo", ".", false);
+        tfe!("foo/", "bar", "foo.bar", true);
+        tfe!("foo/.", "bar", "foo.bar", true);
+        tfe!("..", "foo", "..", false);
+        tfe!("foo/..", "bar", "foo/..", false);
+        tfe!("/", "foo", "/", false);
+    }
+
+    #[test]
+    fn test_eq_recievers() {
+        use borrow::Cow;
+
+        let borrowed: &Path = Path::new("foo/bar");
+        let mut owned: PathBuf = PathBuf::new();
+        owned.push("foo");
+        owned.push("bar");
+        let borrowed_cow: Cow<Path> = borrowed.into();
+        let owned_cow: Cow<Path> = owned.clone().into();
+
+        macro_rules! t {
+            ($($current:expr),+) => {
+                $(
+                    assert_eq!($current, borrowed);
+                    assert_eq!($current, owned);
+                    assert_eq!($current, borrowed_cow);
+                    assert_eq!($current, owned_cow);
+                )+
+            }
+        }
+
+        t!(borrowed, owned, borrowed_cow, owned_cow);
+    }
+
+    #[test]
+    pub fn test_compare() {
+        use hash::{Hash, Hasher};
+        use collections::hash_map::DefaultHasher;
+
+        fn hash<T: Hash>(t: T) -> u64 {
+            let mut s = DefaultHasher::new();
+            t.hash(&mut s);
+            s.finish()
+        }
+
+        macro_rules! tc(
+            ($path1:expr, $path2:expr, eq: $eq:expr,
+             starts_with: $starts_with:expr, ends_with: $ends_with:expr,
+             relative_from: $relative_from:expr) => ({
+                 let path1 = Path::new($path1);
+                 let path2 = Path::new($path2);
+
+                 let eq = path1 == path2;
+                 assert!(eq == $eq, "{:?} == {:?}, expected {:?}, got {:?}",
+                         $path1, $path2, $eq, eq);
+                 assert!($eq == (hash(path1) == hash(path2)),
+                         "{:?} == {:?}, expected {:?}, got {} and {}",
+                         $path1, $path2, $eq, hash(path1), hash(path2));
+
+                 let starts_with = path1.starts_with(path2);
+                 assert!(starts_with == $starts_with,
+                         "{:?}.starts_with({:?}), expected {:?}, got {:?}", $path1, $path2,
+                         $starts_with, starts_with);
+
+                 let ends_with = path1.ends_with(path2);
+                 assert!(ends_with == $ends_with,
+                         "{:?}.ends_with({:?}), expected {:?}, got {:?}", $path1, $path2,
+                         $ends_with, ends_with);
+
+                 let relative_from = path1.strip_prefix(path2)
+                                          .map(|p| p.to_str().unwrap())
+                                          .ok();
+                 let exp: Option<&str> = $relative_from;
+                 assert!(relative_from == exp,
+                         "{:?}.strip_prefix({:?}), expected {:?}, got {:?}",
+                         $path1, $path2, exp, relative_from);
+            });
+        );
+
+        tc!("", "",
+            eq: true,
+            starts_with: true,
+            ends_with: true,
+            relative_from: Some("")
+            );
+
+        tc!("foo", "",
+            eq: false,
+            starts_with: true,
+            ends_with: true,
+            relative_from: Some("foo")
+            );
+
+        tc!("", "foo",
+            eq: false,
+            starts_with: false,
+            ends_with: false,
+            relative_from: None
+            );
+
+        tc!("foo", "foo",
+            eq: true,
+            starts_with: true,
+            ends_with: true,
+            relative_from: Some("")
+            );
+
+        tc!("foo/", "foo",
+            eq: true,
+            starts_with: true,
+            ends_with: true,
+            relative_from: Some("")
+            );
+
+        tc!("foo/bar", "foo",
+            eq: false,
+            starts_with: true,
+            ends_with: false,
+            relative_from: Some("bar")
+            );
+
+        tc!("foo/bar/baz", "foo/bar",
+            eq: false,
+            starts_with: true,
+            ends_with: false,
+            relative_from: Some("baz")
+            );
+
+        tc!("foo/bar", "foo/bar/baz",
+            eq: false,
+            starts_with: false,
+            ends_with: false,
+            relative_from: None
+            );
+
+        tc!("./foo/bar/", ".",
+            eq: false,
+            starts_with: true,
+            ends_with: false,
+            relative_from: Some("foo/bar")
+            );
+
+        if cfg!(windows) {
+            tc!(r"C:\src\rust\cargo-test\test\Cargo.toml",
+                r"c:\src\rust\cargo-test\test",
+                eq: false,
+                starts_with: true,
+                ends_with: false,
+                relative_from: Some("Cargo.toml")
+                );
+
+            tc!(r"c:\foo", r"C:\foo",
+                eq: true,
+                starts_with: true,
+                ends_with: true,
+                relative_from: Some("")
+                );
+        }
+    }
+
+    #[test]
+    fn test_components_debug() {
+        let path = Path::new("/tmp");
+
+        let mut components = path.components();
+
+        let expected = "Components([RootDir, Normal(\"tmp\")])";
+        let actual = format!("{:?}", components);
+        assert_eq!(expected, actual);
+
+        let _ = components.next().unwrap();
+        let expected = "Components([Normal(\"tmp\")])";
+        let actual = format!("{:?}", components);
+        assert_eq!(expected, actual);
+
+        let _ = components.next().unwrap();
+        let expected = "Components([])";
+        let actual = format!("{:?}", components);
+        assert_eq!(expected, actual);
+    }
+
+    #[cfg(unix)]
+    #[test]
+    fn test_iter_debug() {
+        let path = Path::new("/tmp");
+
+        let mut iter = path.iter();
+
+        let expected = "Iter([\"/\", \"tmp\"])";
+        let actual = format!("{:?}", iter);
+        assert_eq!(expected, actual);
+
+        let _ = iter.next().unwrap();
+        let expected = "Iter([\"tmp\"])";
+        let actual = format!("{:?}", iter);
+        assert_eq!(expected, actual);
+
+        let _ = iter.next().unwrap();
+        let expected = "Iter([])";
+        let actual = format!("{:?}", iter);
+        assert_eq!(expected, actual);
+    }
+}