std: Move std::env to the new I/O APIs

This commit moves `std::env` away from the `std::old_io` error type as well as
the `std::old_path` module. Methods returning an error now return `io::Error`
and methods consuming or returning paths use `std::path` instead of
`std::old_path`. This commit does not yet mark these APIs as `#[stable]`.

This commit also migrates `std::old_io::TempDir` to `std::fs::TempDir` with
essentially the exact same API. This type was added to interoperate with the new
path API and has its own `tempdir` feature.

Finally, this commit reverts the deprecation of `std::os` APIs returning the old
path API types. This deprecation can come back once the entire `std::old_path`
module is deprecated.

[breaking-change]

1 files changed, 0 insertions, 1503 deletions

diff --git a/src/libstd/fs.rs b/src/libstd/fs.rs
deleted file mode 100644
index 98c1b50a9bf..00000000000
--- a/src/libstd/fs.rs
+++ /dev/null
@@ -1,1503 +0,0 @@
-// 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.
-
-//! Filesystem manipulation operations
-//!
-//! This module contains basic methods to manipulate the contents of the local
-//! filesystem. All methods in this module represent cross-platform filesystem
-//! operations. Extra platform-specific functionality can be found in the
-//! extension traits of `std::os::$platform`.
-
-#![unstable(feature = "fs")]
-
-use core::prelude::*;
-
-use io::{self, Error, ErrorKind, SeekFrom, Seek, Read, Write};
-use path::{AsPath, Path, PathBuf};
-use sys::fs2 as fs_imp;
-use sys_common::{AsInnerMut, FromInner, AsInner};
-use vec::Vec;
-
-/// A reference to an open file on the filesystem.
-///
-/// An instance of a `File` can be read and/or written depending on what options
-/// it was opened with. Files also implement `Seek` to alter the logical cursor
-/// that the file contains internally.
-///
-/// # Example
-///
-/// ```no_run
-/// use std::io::prelude::*;
-/// use std::fs::File;
-///
-/// # fn foo() -> std::io::Result<()> {
-/// let mut f = try!(File::create("foo.txt"));
-/// try!(f.write_all(b"Hello, world!"));
-///
-/// let mut f = try!(File::open("foo.txt"));
-/// let mut s = String::new();
-/// try!(f.read_to_string(&mut s));
-/// assert_eq!(s, "Hello, world!");
-/// # Ok(())
-/// # }
-/// ```
-pub struct File {
-    inner: fs_imp::File,
-    path: PathBuf,
-}
-
-/// Metadata information about a file.
-///
-/// This structure is returned from the `metadata` function or method and
-/// represents known metadata about a file such as its permissions, size,
-/// modification times, etc.
-pub struct Metadata(fs_imp::FileAttr);
-
-/// Iterator over the entries in a directory.
-///
-/// This iterator is returned from the `read_dir` function of this module and
-/// will yield instances of `io::Result<DirEntry>`. Through a `DirEntry`
-/// information like the entry's path and possibly other metadata can be
-/// learned.
-pub struct ReadDir(fs_imp::ReadDir);
-
-/// Entries returned by the `ReadDir` iterator.
-///
-/// An instance of `DirEntry` represents an entry inside of a directory on the
-/// filesystem. Each entry can be inspected via methods to learn about the full
-/// path or possibly other metadata through per-platform extension traits.
-pub struct DirEntry(fs_imp::DirEntry);
-
-/// An iterator that recursively walks over the contents of a directory.
-pub struct WalkDir {
-    cur: Option<ReadDir>,
-    stack: Vec<io::Result<ReadDir>>,
-}
-
-/// Options and flags which can be used to configure how a file is opened.
-///
-/// This builder exposes the ability to configure how a `File` is opened and
-/// what operations are permitted on the open file. The `File::open` and
-/// `File::create` methods are aliases for commonly used options using this
-/// builder.
-#[derive(Clone)]
-pub struct OpenOptions(fs_imp::OpenOptions);
-
-/// Representation of the various permissions on a file.
-///
-/// This module only currently provides one bit of information, `readonly`,
-/// which is exposed on all currently supported platforms. Unix-specific
-/// functionality, such as mode bits, is available through the
-/// `os::unix::PermissionsExt` trait.
-#[derive(Clone, PartialEq, Eq, Debug)]
-pub struct Permissions(fs_imp::FilePermissions);
-
-impl File {
-    /// Attempts to open a file in read-only mode.
-    ///
-    /// See the `OpenOptions::open` method for more details.
-    ///
-    /// # Errors
-    ///
-    /// This function will return an error if `path` does not already exist.
-    /// Other errors may also be returned according to `OpenOptions::open`.
-    pub fn open<P: AsPath + ?Sized>(path: &P) -> io::Result<File> {
-        OpenOptions::new().read(true).open(path)
-    }
-
-    /// Open a file in write-only mode.
-    ///
-    /// This function will create a file if it does not exist,
-    /// and will truncate it if it does.
-    ///
-    /// See the `OpenOptions::open` function for more details.
-    pub fn create<P: AsPath + ?Sized>(path: &P) -> io::Result<File> {
-        OpenOptions::new().write(true).create(true).truncate(true).open(path)
-    }
-
-    /// Returns the original path that was used to open this file.
-    pub fn path(&self) -> Option<&Path> {
-        Some(&self.path)
-    }
-
-    /// Attempt to sync all OS-internal metadata to disk.
-    ///
-    /// This function will attempt to ensure that all in-core data reaches the
-    /// filesystem before returning.
-    pub fn sync_all(&self) -> io::Result<()> {
-        self.inner.fsync()
-    }
-
-    /// This function is similar to `sync_all`, except that it may not
-    /// synchronize file metadata to the filesystem.
-    ///
-    /// This is intended for use cases that must synchronize content, but don't
-    /// need the metadata on disk. The goal of this method is to reduce disk
-    /// operations.
-    ///
-    /// Note that some platforms may simply implement this in terms of
-    /// `sync_all`.
-    pub fn sync_data(&self) -> io::Result<()> {
-        self.inner.datasync()
-    }
-
-    /// Truncates or extends the underlying file, updating the size of
-    /// this file to become `size`.
-    ///
-    /// If the `size` is less than the current file's size, then the file will
-    /// be shrunk. If it is greater than the current file's size, then the file
-    /// will be extended to `size` and have all of the intermediate data filled
-    /// in with 0s.
-    pub fn set_len(&self, size: u64) -> io::Result<()> {
-        self.inner.truncate(size)
-    }
-
-    /// Queries information about the underlying file.
-    pub fn metadata(&self) -> io::Result<Metadata> {
-        self.inner.file_attr().map(Metadata)
-    }
-}
-
-impl AsInner<fs_imp::File> for File {
-    fn as_inner(&self) -> &fs_imp::File { &self.inner }
-}
-impl Read for File {
-    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
-        self.inner.read(buf)
-    }
-}
-impl Write for File {
-    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        self.inner.write(buf)
-    }
-    fn flush(&mut self) -> io::Result<()> { self.inner.flush() }
-}
-impl Seek for File {
-    fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
-        self.inner.seek(pos)
-    }
-}
-impl<'a> Read for &'a File {
-    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
-        self.inner.read(buf)
-    }
-}
-impl<'a> Write for &'a File {
-    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        self.inner.write(buf)
-    }
-    fn flush(&mut self) -> io::Result<()> { self.inner.flush() }
-}
-impl<'a> Seek for &'a File {
-    fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
-        self.inner.seek(pos)
-    }
-}
-
-impl OpenOptions {
-    /// Creates a blank net set of options ready for configuration.
-    ///
-    /// All options are initially set to `false`.
-    pub fn new() -> OpenOptions {
-        OpenOptions(fs_imp::OpenOptions::new())
-    }
-
-    /// Set the option for read access.
-    ///
-    /// This option, when true, will indicate that the file should be
-    /// `read`-able if opened.
-    pub fn read(&mut self, read: bool) -> &mut OpenOptions {
-        self.0.read(read); self
-    }
-
-    /// Set the option for write access.
-    ///
-    /// This option, when true, will indicate that the file should be
-    /// `write`-able if opened.
-    pub fn write(&mut self, write: bool) -> &mut OpenOptions {
-        self.0.write(write); self
-    }
-
-    /// Set the option for the append mode.
-    ///
-    /// This option, when true, means that writes will append to a file instead
-    /// of overwriting previous contents.
-    pub fn append(&mut self, append: bool) -> &mut OpenOptions {
-        self.0.append(append); self
-    }
-
-    /// Set the option for truncating a previous file.
-    ///
-    /// If a file is successfully opened with this option set it will truncate
-    /// the file to 0 length if it already exists.
-    pub fn truncate(&mut self, truncate: bool) -> &mut OpenOptions {
-        self.0.truncate(truncate); self
-    }
-
-    /// Set the option for creating a new file.
-    ///
-    /// This option indicates whether a new file will be created if the file
-    /// does not yet already exist.
-    pub fn create(&mut self, create: bool) -> &mut OpenOptions {
-        self.0.create(create); self
-    }
-
-    /// Open a file at `path` with the options specified by `self`.
-    ///
-    /// # Errors
-    ///
-    /// This function will return an error under a number of different
-    /// circumstances, to include but not limited to:
-    ///
-    /// * Opening a file that does not exist with read access.
-    /// * Attempting to open a file with access that the user lacks
-    ///   permissions for
-    /// * Filesystem-level errors (full disk, etc)
-    pub fn open<P: AsPath + ?Sized>(&self, path: &P) -> io::Result<File> {
-        let path = path.as_path();
-        let inner = try!(fs_imp::File::open(path, &self.0));
-
-        // On *BSD systems, we can open a directory as a file and read from
-        // it: fd=open("/tmp", O_RDONLY); read(fd, buf, N); due to an old
-        // tradition before the introduction of opendir(3).  We explicitly
-        // reject it because there are few use cases.
-        if cfg!(not(any(target_os = "linux", target_os = "android"))) &&
-           try!(inner.file_attr()).is_dir() {
-            Err(Error::new(ErrorKind::InvalidInput, "is a directory", None))
-        } else {
-            Ok(File { path: path.to_path_buf(), inner: inner })
-        }
-    }
-}
-impl AsInnerMut<fs_imp::OpenOptions> for OpenOptions {
-    fn as_inner_mut(&mut self) -> &mut fs_imp::OpenOptions { &mut self.0 }
-}
-
-impl Metadata {
-    /// Returns whether this metadata is for a directory.
-    pub fn is_dir(&self) -> bool { self.0.is_dir() }
-
-    /// Returns whether this metadata is for a regular file.
-    pub fn is_file(&self) -> bool { self.0.is_file() }
-
-    /// Returns the size of the file, in bytes, this metadata is for.
-    pub fn len(&self) -> u64 { self.0.size() }
-
-    /// Returns the permissions of the file this metadata is for.
-    pub fn permissions(&self) -> Permissions {
-        Permissions(self.0.perm())
-    }
-
-    /// Returns the most recent access time for a file.
-    ///
-    /// The return value is in milliseconds since the epoch.
-    pub fn accessed(&self) -> u64 { self.0.accessed() }
-
-    /// Returns the most recent modification time for a file.
-    ///
-    /// The return value is in milliseconds since the epoch.
-    pub fn modified(&self) -> u64 { self.0.modified() }
-}
-
-impl Permissions {
-    /// Returns whether these permissions describe a readonly file.
-    pub fn readonly(&self) -> bool { self.0.readonly() }
-
-    /// Modify the readonly flag for this set of permissions.
-    ///
-    /// This operation does **not** modify the filesystem. To modify the
-    /// filesystem use the `fs::set_permissions` function.
-    pub fn set_readonly(&mut self, readonly: bool) {
-        self.0.set_readonly(readonly)
-    }
-}
-
-impl FromInner<fs_imp::FilePermissions> for Permissions {
-    fn from_inner(f: fs_imp::FilePermissions) -> Permissions {
-        Permissions(f)
-    }
-}
-
-impl Iterator for ReadDir {
-    type Item = io::Result<DirEntry>;
-
-    fn next(&mut self) -> Option<io::Result<DirEntry>> {
-        self.0.next().map(|entry| entry.map(DirEntry))
-    }
-}
-
-impl DirEntry {
-    /// Returns the full path to the file that this entry represents.
-    ///
-    /// The full path is created by joining the original path to `read_dir` or
-    /// `walk_dir` with the filename of this entry.
-    pub fn path(&self) -> PathBuf { self.0.path() }
-}
-
-/// Remove a file from the underlying filesystem.
-///
-/// # Example
-///
-/// ```rust,no_run
-/// use std::fs;
-///
-/// fs::remove_file("/some/file/path.txt");
-/// ```
-///
-/// Note that, just because an unlink call was successful, it is not
-/// guaranteed that a file is immediately deleted (e.g. depending on
-/// platform, other open file descriptors may prevent immediate removal).
-///
-/// # Errors
-///
-/// This function will return an error if `path` points to a directory, if the
-/// user lacks permissions to remove the file, or if some other filesystem-level
-/// error occurs.
-pub fn remove_file<P: AsPath + ?Sized>(path: &P) -> io::Result<()> {
-    let path = path.as_path();
-    let e = match fs_imp::unlink(path) {
-        Ok(()) => return Ok(()),
-        Err(e) => e,
-    };
-    if !cfg!(windows) { return Err(e) }
-
-    // On unix, a readonly file can be successfully removed. On windows,
-    // however, it cannot. To keep the two platforms in line with
-    // respect to their behavior, catch this case on windows, attempt to
-    // change it to read-write, and then remove the file.
-    if e.kind() != ErrorKind::PermissionDenied { return Err(e) }
-
-    let attr = match metadata(path) { Ok(a) => a, Err(..) => return Err(e) };
-    let mut perms = attr.permissions();
-    if !perms.readonly() { return Err(e) }
-    perms.set_readonly(false);
-
-    if set_permissions(path, perms).is_err() { return Err(e) }
-    if fs_imp::unlink(path).is_ok() { return Ok(()) }
-
-    // Oops, try to put things back the way we found it
-    let _ = set_permissions(path, attr.permissions());
-    Err(e)
-}
-
-/// Given a path, query the file system to get information about a file,
-/// directory, etc.
-///
-/// This function will traverse soft links to query information about the
-/// destination file.
-///
-/// # Example
-///
-/// ```rust,no_run
-/// # fn foo() -> std::io::Result<()> {
-/// use std::fs;
-///
-/// let attr = try!(fs::metadata("/some/file/path.txt"));
-/// // inspect attr ...
-/// # Ok(())
-/// # }
-/// ```
-///
-/// # Errors
-///
-/// This function will return an error if the user lacks the requisite
-/// permissions to perform a `metadata` call on the given `path` or if there
-/// is no entry in the filesystem at the provided path.
-pub fn metadata<P: AsPath + ?Sized>(path: &P) -> io::Result<Metadata> {
-    fs_imp::stat(path.as_path()).map(Metadata)
-}
-
-/// Rename a file or directory to a new name.
-///
-/// # Example
-///
-/// ```rust,no_run
-/// use std::fs;
-///
-/// fs::rename("foo", "bar");
-/// ```
-///
-/// # Errors
-///
-/// This function will return an error if the provided `from` doesn't exist, if
-/// the process lacks permissions to view the contents, if `from` and `to`
-/// reside on separate filesystems, or if some other intermittent I/O error
-/// occurs.
-pub fn rename<P: AsPath + ?Sized, Q: AsPath + ?Sized>(from: &P, to: &Q)
-                                                      -> io::Result<()> {
-    fs_imp::rename(from.as_path(), to.as_path())
-}
-
-/// Copies the contents of one file to another. This function will also
-/// copy the permission bits of the original file to the destination file.
-///
-/// This function will **overwrite** the contents of `to`.
-///
-/// Note that if `from` and `to` both point to the same file, then the file
-/// will likely get truncated by this operation.
-///
-/// # Example
-///
-/// ```rust
-/// use std::fs;
-///
-/// fs::copy("foo.txt", "bar.txt");
-/// ```
-///
-/// # Errors
-///
-/// This function will return an error in the following situations, but is not
-/// limited to just these cases:
-///
-/// * The `from` path is not a file
-/// * The `from` file does not exist
-/// * The current process does not have the permission rights to access
-///   `from` or write `to`
-pub fn copy<P: AsPath + ?Sized, Q: AsPath + ?Sized>(from: &P, to: &Q)
-                                                    -> io::Result<u64> {
-    let from = from.as_path();
-    if !from.is_file() {
-        return Err(Error::new(ErrorKind::MismatchedFileTypeForOperation,
-                              "the source path is not an existing file",
-                              None))
-    }
-
-    let mut reader = try!(File::open(from));
-    let mut writer = try!(File::create(to));
-    let perm = try!(reader.metadata()).permissions();
-
-    let ret = try!(io::copy(&mut reader, &mut writer));
-    try!(set_permissions(to, perm));
-    Ok(ret)
-}
-
-/// Creates a new hard link on the filesystem.
-///
-/// The `dst` path will be a link pointing to the `src` path. Note that systems
-/// often require these two paths to both be located on the same filesystem.
-pub fn hard_link<P: AsPath + ?Sized, Q: AsPath + ?Sized>(src: &P, dst: &Q)
-                                                         -> io::Result<()> {
-    fs_imp::link(src.as_path(), dst.as_path())
-}
-
-/// Creates a new soft link on the filesystem.
-///
-/// The `dst` path will be a soft link pointing to the `src` path.
-pub fn soft_link<P: AsPath + ?Sized, Q: AsPath + ?Sized>(src: &P, dst: &Q)
-                                                         -> io::Result<()> {
-    fs_imp::symlink(src.as_path(), dst.as_path())
-}
-
-/// Reads a soft link, returning the file that the link points to.
-///
-/// # Errors
-///
-/// This function will return an error on failure. Failure conditions include
-/// reading a file that does not exist or reading a file that is not a soft
-/// link.
-pub fn read_link<P: AsPath + ?Sized>(path: &P) -> io::Result<PathBuf> {
-    fs_imp::readlink(path.as_path())
-}
-
-/// Create a new, empty directory at the provided path
-///
-/// # Example
-///
-/// ```rust
-/// use std::fs;
-///
-/// fs::create_dir("/some/dir");
-/// ```
-///
-/// # Errors
-///
-/// This function will return an error if the user lacks permissions to make a
-/// new directory at the provided `path`, or if the directory already exists.
-pub fn create_dir<P: AsPath + ?Sized>(path: &P) -> io::Result<()> {
-    fs_imp::mkdir(path.as_path())
-}
-
-/// Recursively create a directory and all of its parent components if they
-/// are missing.
-///
-/// # Errors
-///
-/// This function will fail if any directory in the path specified by `path`
-/// does not already exist and it could not be created otherwise. The specific
-/// error conditions for when a directory is being created (after it is
-/// determined to not exist) are outlined by `fs::create_dir`.
-pub fn create_dir_all<P: AsPath + ?Sized>(path: &P) -> io::Result<()> {
-    let path = path.as_path();
-    if path.is_dir() { return Ok(()) }
-    match path.parent() {
-        Some(p) if p != path => try!(create_dir_all(p)),
-        _ => {}
-    }
-    create_dir(path)
-}
-
-/// Remove an existing, empty directory
-///
-/// # Example
-///
-/// ```rust
-/// use std::fs;
-///
-/// fs::remove_dir("/some/dir");
-/// ```
-///
-/// # Errors
-///
-/// This function will return an error if the user lacks permissions to remove
-/// the directory at the provided `path`, or if the directory isn't empty.
-pub fn remove_dir<P: AsPath + ?Sized>(path: &P) -> io::Result<()> {
-    fs_imp::rmdir(path.as_path())
-}
-
-/// Removes a directory at this path, after removing all its contents. Use
-/// carefully!
-///
-/// This function does **not** follow soft links and it will simply remove the
-/// soft link itself.
-///
-/// # Errors
-///
-/// See `file::remove_file` and `fs::remove_dir`
-pub fn remove_dir_all<P: AsPath + ?Sized>(path: &P) -> io::Result<()> {
-    let path = path.as_path();
-    for child in try!(read_dir(path)) {
-        let child = try!(child).path();
-        let stat = try!(lstat(&*child));
-        if stat.is_dir() {
-            try!(remove_dir_all(&*child));
-        } else {
-            try!(remove_file(&*child));
-        }
-    }
-    return remove_dir(path);
-
-    #[cfg(unix)]
-    fn lstat(path: &Path) -> io::Result<fs_imp::FileAttr> { fs_imp::lstat(path) }
-    #[cfg(windows)]
-    fn lstat(path: &Path) -> io::Result<fs_imp::FileAttr> { fs_imp::stat(path) }
-}
-
-/// 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.
-///
-/// # Example
-///
-/// ```rust
-/// use std::io;
-/// use std::fs::{self, PathExt, DirEntry};
-/// use std::path::Path;
-///
-/// // one possible implementation of fs::walk_dir only visiting files
-/// fn visit_dirs(dir: &Path, cb: &mut FnMut(DirEntry)) -> io::Result<()> {
-///     if dir.is_dir() {
-///         for entry in try!(fs::read_dir(dir)) {
-///             let entry = try!(entry);
-///             if entry.path().is_dir() {
-///                 try!(visit_dirs(&entry.path(), cb));
-///             } else {
-///                 cb(entry);
-///             }
-///         }
-///     }
-///     Ok(())
-/// }
-/// ```
-///
-/// # Errors
-///
-/// This function will return an error if the provided `path` doesn't exist, if
-/// the process lacks permissions to view the contents or if the `path` points
-/// at a non-directory file
-pub fn read_dir<P: AsPath + ?Sized>(path: &P) -> io::Result<ReadDir> {
-    fs_imp::readdir(path.as_path()).map(ReadDir)
-}
-
-/// Returns an iterator that will recursively walk the directory structure
-/// rooted at `path`.
-///
-/// The path given will not be iterated over, and this will perform iteration in
-/// some top-down order.  The contents of unreadable subdirectories are ignored.
-///
-/// The iterator will yield instances of `io::Result<DirEntry>`. New errors may
-/// be encountered after an iterator is initially constructed.
-pub fn walk_dir<P: AsPath + ?Sized>(path: &P) -> io::Result<WalkDir> {
-    let start = try!(read_dir(path));
-    Ok(WalkDir { cur: Some(start), stack: Vec::new() })
-}
-
-impl Iterator for WalkDir {
-    type Item = io::Result<DirEntry>;
-
-    fn next(&mut self) -> Option<io::Result<DirEntry>> {
-        loop {
-            if let Some(ref mut cur) = self.cur {
-                match cur.next() {
-                    Some(Err(e)) => return Some(Err(e)),
-                    Some(Ok(next)) => {
-                        let path = next.path();
-                        if path.is_dir() {
-                            self.stack.push(read_dir(&*path));
-                        }
-                        return Some(Ok(next))
-                    }
-                    None => {}
-                }
-            }
-            self.cur = None;
-            match self.stack.pop() {
-                Some(Err(e)) => return Some(Err(e)),
-                Some(Ok(next)) => self.cur = Some(next),
-                None => return None,
-            }
-        }
-    }
-}
-
-/// Utility methods for paths.
-pub trait PathExt {
-    /// Get information on the file, directory, etc at this path.
-    ///
-    /// Consult the `fs::stat` documentation for more info.
-    ///
-    /// This call preserves identical runtime/error semantics with `file::stat`.
-    fn metadata(&self) -> io::Result<Metadata>;
-
-    /// Boolean value indicator whether the underlying file exists on the local
-    /// filesystem. Returns false in exactly the cases where `fs::stat` fails.
-    fn exists(&self) -> bool;
-
-    /// Whether the underlying implementation (be it a file path, or something
-    /// else) points at a "regular file" on the FS. Will return false for paths
-    /// to non-existent locations or directories or other non-regular files
-    /// (named pipes, etc). Follows links when making this determination.
-    fn is_file(&self) -> bool;
-
-    /// Whether the underlying implementation (be it a file path, or something
-    /// else) is pointing at a directory in the underlying FS. Will return
-    /// false for paths to non-existent locations or if the item is not a
-    /// directory (eg files, named pipes, etc). Follows links when making this
-    /// determination.
-    fn is_dir(&self) -> bool;
-}
-
-impl PathExt for Path {
-    fn metadata(&self) -> io::Result<Metadata> { metadata(self) }
-
-    fn exists(&self) -> bool { metadata(self).is_ok() }
-
-    fn is_file(&self) -> bool {
-        metadata(self).map(|s| s.is_file()).unwrap_or(false)
-    }
-    fn is_dir(&self) -> bool {
-        metadata(self).map(|s| s.is_dir()).unwrap_or(false)
-    }
-}
-
-/// Changes the timestamps for a file's last modification and access time.
-///
-/// The file at the path specified will have its last access time set to
-/// `atime` and its modification time set to `mtime`. The times specified should
-/// be in milliseconds.
-pub fn set_file_times<P: AsPath + ?Sized>(path: &P, accessed: u64,
-                                          modified: u64) -> io::Result<()> {
-    fs_imp::utimes(path.as_path(), accessed, modified)
-}
-
-/// Changes the permissions found on a file or a directory.
-///
-/// # Example
-///
-/// ```
-/// # fn foo() -> std::io::Result<()> {
-/// use std::fs;
-///
-/// let mut perms = try!(fs::metadata("foo.txt")).permissions();
-/// perms.set_readonly(true);
-/// try!(fs::set_permissions("foo.txt", perms));
-/// # Ok(())
-/// # }
-/// ```
-///
-/// # Errors
-///
-/// This function will return an error if the provided `path` doesn't exist, if
-/// the process lacks permissions to change the attributes of the file, or if
-/// some other I/O error is encountered.
-pub fn set_permissions<P: AsPath + ?Sized>(path: &P, perm: Permissions)
-                                           -> io::Result<()> {
-    fs_imp::set_perm(path.as_path(), perm.0)
-}
-
-#[cfg(test)]
-mod tests {
-    #![allow(deprecated)] //rand
-
-    use prelude::v1::*;
-    use io::prelude::*;
-
-    use fs::{self, File, OpenOptions};
-    use io::{ErrorKind, SeekFrom};
-    use path::PathBuf;
-    use path::Path as Path2;
-    use os;
-    use rand::{self, StdRng, Rng};
-    use str;
-
-    macro_rules! check { ($e:expr) => (
-        match $e {
-            Ok(t) => t,
-            Err(e) => panic!("{} failed with: {}", stringify!($e), e),
-        }
-    ) }
-
-    macro_rules! error { ($e:expr, $s:expr) => (
-        match $e {
-            Ok(_) => panic!("Unexpected success. Should've been: {:?}", $s),
-            Err(ref err) => assert!(err.to_string().contains($s.as_slice()),
-                                    format!("`{}` did not contain `{}`", err, $s))
-        }
-    ) }
-
-    pub struct TempDir(PathBuf);
-
-    impl TempDir {
-        fn join(&self, path: &str) -> PathBuf {
-            let TempDir(ref p) = *self;
-            p.join(path)
-        }
-
-        fn path<'a>(&'a self) -> &'a Path2 {
-            let TempDir(ref p) = *self;
-            p
-        }
-    }
-
-    impl Drop for TempDir {
-        fn drop(&mut self) {
-            // Gee, seeing how we're testing the fs module I sure hope that we
-            // at least implement this correctly!
-            let TempDir(ref p) = *self;
-            check!(fs::remove_dir_all(p));
-        }
-    }
-
-    pub fn tmpdir() -> TempDir {
-        let s = os::tmpdir();
-        let p = Path2::new(s.as_str().unwrap());
-        let ret = p.join(&format!("rust-{}", rand::random::<u32>()));
-        check!(fs::create_dir(&ret));
-        TempDir(ret)
-    }
-
-    #[test]
-    fn file_test_io_smoke_test() {
-        let message = "it's alright. have a good time";
-        let tmpdir = tmpdir();
-        let filename = &tmpdir.join("file_rt_io_file_test.txt");
-        {
-            let mut write_stream = check!(File::create(filename));
-            check!(write_stream.write(message.as_bytes()));
-        }
-        {
-            let mut read_stream = check!(File::open(filename));
-            let mut read_buf = [0; 1028];
-            let read_str = match check!(read_stream.read(&mut read_buf)) {
-                -1|0 => panic!("shouldn't happen"),
-                n => str::from_utf8(&read_buf[..n]).unwrap().to_string()
-            };
-            assert_eq!(read_str.as_slice(), message);
-        }
-        check!(fs::remove_file(filename));
-    }
-
-    #[test]
-    fn invalid_path_raises() {
-        let tmpdir = tmpdir();
-        let filename = &tmpdir.join("file_that_does_not_exist.txt");
-        let result = File::open(filename);
-
-        if cfg!(unix) {
-            error!(result, "o such file or directory");
-        }
-        // error!(result, "couldn't open path as file");
-        // error!(result, format!("path={}; mode=open; access=read", filename.display()));
-    }
-
-    #[test]
-    fn file_test_iounlinking_invalid_path_should_raise_condition() {
-        let tmpdir = tmpdir();
-        let filename = &tmpdir.join("file_another_file_that_does_not_exist.txt");
-
-        let result = fs::remove_file(filename);
-
-        if cfg!(unix) {
-            error!(result, "o such file or directory");
-        }
-        // error!(result, "couldn't unlink path");
-        // error!(result, format!("path={}", filename.display()));
-    }
-
-    #[test]
-    fn file_test_io_non_positional_read() {
-        let message: &str = "ten-four";
-        let mut read_mem = [0; 8];
-        let tmpdir = tmpdir();
-        let filename = &tmpdir.join("file_rt_io_file_test_positional.txt");
-        {
-            let mut rw_stream = check!(File::create(filename));
-            check!(rw_stream.write(message.as_bytes()));
-        }
-        {
-            let mut read_stream = check!(File::open(filename));
-            {
-                let read_buf = &mut read_mem[0..4];
-                check!(read_stream.read(read_buf));
-            }
-            {
-                let read_buf = &mut read_mem[4..8];
-                check!(read_stream.read(read_buf));
-            }
-        }
-        check!(fs::remove_file(filename));
-        let read_str = str::from_utf8(&read_mem).unwrap();
-        assert_eq!(read_str, message);
-    }
-
-    #[test]
-    fn file_test_io_seek_and_tell_smoke_test() {
-        let message = "ten-four";
-        let mut read_mem = [0; 4];
-        let set_cursor = 4 as u64;
-        let mut tell_pos_pre_read;
-        let mut tell_pos_post_read;
-        let tmpdir = tmpdir();
-        let filename = &tmpdir.join("file_rt_io_file_test_seeking.txt");
-        {
-            let mut rw_stream = check!(File::create(filename));
-            check!(rw_stream.write(message.as_bytes()));
-        }
-        {
-            let mut read_stream = check!(File::open(filename));
-            check!(read_stream.seek(SeekFrom::Start(set_cursor)));
-            tell_pos_pre_read = check!(read_stream.seek(SeekFrom::Current(0)));
-            check!(read_stream.read(&mut read_mem));
-            tell_pos_post_read = check!(read_stream.seek(SeekFrom::Current(0)));
-        }
-        check!(fs::remove_file(filename));
-        let read_str = str::from_utf8(&read_mem).unwrap();
-        assert_eq!(read_str, &message[4..8]);
-        assert_eq!(tell_pos_pre_read, set_cursor);
-        assert_eq!(tell_pos_post_read, message.len() as u64);
-    }
-
-    #[test]
-    fn file_test_io_seek_and_write() {
-        let initial_msg =   "food-is-yummy";
-        let overwrite_msg =    "-the-bar!!";
-        let final_msg =     "foo-the-bar!!";
-        let seek_idx = 3;
-        let mut read_mem = [0; 13];
-        let tmpdir = tmpdir();
-        let filename = &tmpdir.join("file_rt_io_file_test_seek_and_write.txt");
-        {
-            let mut rw_stream = check!(File::create(filename));
-            check!(rw_stream.write(initial_msg.as_bytes()));
-            check!(rw_stream.seek(SeekFrom::Start(seek_idx)));
-            check!(rw_stream.write(overwrite_msg.as_bytes()));
-        }
-        {
-            let mut read_stream = check!(File::open(filename));
-            check!(read_stream.read(&mut read_mem));
-        }
-        check!(fs::remove_file(filename));
-        let read_str = str::from_utf8(&read_mem).unwrap();
-        assert!(read_str == final_msg);
-    }
-
-    #[test]
-    fn file_test_io_seek_shakedown() {
-        //                   01234567890123
-        let initial_msg =   "qwer-asdf-zxcv";
-        let chunk_one: &str = "qwer";
-        let chunk_two: &str = "asdf";
-        let chunk_three: &str = "zxcv";
-        let mut read_mem = [0; 4];
-        let tmpdir = tmpdir();
-        let filename = &tmpdir.join("file_rt_io_file_test_seek_shakedown.txt");
-        {
-            let mut rw_stream = check!(File::create(filename));
-            check!(rw_stream.write(initial_msg.as_bytes()));
-        }
-        {
-            let mut read_stream = check!(File::open(filename));
-
-            check!(read_stream.seek(SeekFrom::End(-4)));
-            check!(read_stream.read(&mut read_mem));
-            assert_eq!(str::from_utf8(&read_mem).unwrap(), chunk_three);
-
-            check!(read_stream.seek(SeekFrom::Current(-9)));
-            check!(read_stream.read(&mut read_mem));
-            assert_eq!(str::from_utf8(&read_mem).unwrap(), chunk_two);
-
-            check!(read_stream.seek(SeekFrom::Start(0)));
-            check!(read_stream.read(&mut read_mem));
-            assert_eq!(str::from_utf8(&read_mem).unwrap(), chunk_one);
-        }
-        check!(fs::remove_file(filename));
-    }
-
-    #[test]
-    fn file_test_stat_is_correct_on_is_file() {
-        let tmpdir = tmpdir();
-        let filename = &tmpdir.join("file_stat_correct_on_is_file.txt");
-        {
-            let mut opts = OpenOptions::new();
-            let mut fs = check!(opts.read(true).write(true)
-                                    .create(true).open(filename));
-            let msg = "hw";
-            fs.write(msg.as_bytes()).unwrap();
-
-            let fstat_res = check!(fs.metadata());
-            assert!(fstat_res.is_file());
-        }
-        let stat_res_fn = check!(fs::metadata(filename));
-        assert!(stat_res_fn.is_file());
-        let stat_res_meth = check!(filename.metadata());
-        assert!(stat_res_meth.is_file());
-        check!(fs::remove_file(filename));
-    }
-
-    #[test]
-    fn file_test_stat_is_correct_on_is_dir() {
-        let tmpdir = tmpdir();
-        let filename = &tmpdir.join("file_stat_correct_on_is_dir");
-        check!(fs::create_dir(filename));
-        let stat_res_fn = check!(fs::metadata(filename));
-        assert!(stat_res_fn.is_dir());
-        let stat_res_meth = check!(filename.metadata());
-        assert!(stat_res_meth.is_dir());
-        check!(fs::remove_dir(filename));
-    }
-
-    #[test]
-    fn file_test_fileinfo_false_when_checking_is_file_on_a_directory() {
-        let tmpdir = tmpdir();
-        let dir = &tmpdir.join("fileinfo_false_on_dir");
-        check!(fs::create_dir(dir));
-        assert!(dir.is_file() == false);
-        check!(fs::remove_dir(dir));
-    }
-
-    #[test]
-    fn file_test_fileinfo_check_exists_before_and_after_file_creation() {
-        let tmpdir = tmpdir();
-        let file = &tmpdir.join("fileinfo_check_exists_b_and_a.txt");
-        check!(check!(File::create(file)).write(b"foo"));
-        assert!(file.exists());
-        check!(fs::remove_file(file));
-        assert!(!file.exists());
-    }
-
-    #[test]
-    fn file_test_directoryinfo_check_exists_before_and_after_mkdir() {
-        let tmpdir = tmpdir();
-        let dir = &tmpdir.join("before_and_after_dir");
-        assert!(!dir.exists());
-        check!(fs::create_dir(dir));
-        assert!(dir.exists());
-        assert!(dir.is_dir());
-        check!(fs::remove_dir(dir));
-        assert!(!dir.exists());
-    }
-
-    #[test]
-    fn file_test_directoryinfo_readdir() {
-        let tmpdir = tmpdir();
-        let dir = &tmpdir.join("di_readdir");
-        check!(fs::create_dir(dir));
-        let prefix = "foo";
-        for n in range(0, 3) {
-            let f = dir.join(&format!("{}.txt", n));
-            let mut w = check!(File::create(&f));
-            let msg_str = format!("{}{}", prefix, n.to_string());
-            let msg = msg_str.as_bytes();
-            check!(w.write(msg));
-        }
-        let files = check!(fs::read_dir(dir));
-        let mut mem = [0u8; 4];
-        for f in files {
-            let f = f.unwrap().path();
-            {
-                let n = f.file_stem().unwrap();
-                check!(check!(File::open(&f)).read(&mut mem));
-                let read_str = str::from_utf8(&mem).unwrap();
-                let expected = format!("{}{}", prefix, n.to_str().unwrap());
-                assert_eq!(expected.as_slice(), read_str);
-            }
-            check!(fs::remove_file(&f));
-        }
-        check!(fs::remove_dir(dir));
-    }
-
-    #[test]
-    fn file_test_walk_dir() {
-        let tmpdir = tmpdir();
-        let dir = &tmpdir.join("walk_dir");
-        check!(fs::create_dir(dir));
-
-        let dir1 = &dir.join("01/02/03");
-        check!(fs::create_dir_all(dir1));
-        check!(File::create(&dir1.join("04")));
-
-        let dir2 = &dir.join("11/12/13");
-        check!(fs::create_dir_all(dir2));
-        check!(File::create(&dir2.join("14")));
-
-        let files = check!(fs::walk_dir(dir));
-        let mut cur = [0u8; 2];
-        for f in files {
-            let f = f.unwrap().path();
-            let stem = f.file_stem().unwrap().to_str().unwrap();
-            let root = stem.as_bytes()[0] - b'0';
-            let name = stem.as_bytes()[1] - b'0';
-            assert!(cur[root as usize] < name);
-            cur[root as usize] = name;
-        }
-
-        check!(fs::remove_dir_all(dir));
-    }
-
-    #[test]
-    fn mkdir_path_already_exists_error() {
-        let tmpdir = tmpdir();
-        let dir = &tmpdir.join("mkdir_error_twice");
-        check!(fs::create_dir(dir));
-        let e = fs::create_dir(dir).err().unwrap();
-        assert_eq!(e.kind(), ErrorKind::PathAlreadyExists);
-    }
-
-    #[test]
-    fn recursive_mkdir() {
-        let tmpdir = tmpdir();
-        let dir = tmpdir.join("d1/d2");
-        check!(fs::create_dir_all(&dir));
-        assert!(dir.is_dir())
-    }
-
-    #[test]
-    fn recursive_mkdir_failure() {
-        let tmpdir = tmpdir();
-        let dir = tmpdir.join("d1");
-        let file = dir.join("f1");
-
-        check!(fs::create_dir_all(&dir));
-        check!(File::create(&file));
-
-        let result = fs::create_dir_all(&file);
-
-        assert!(result.is_err());
-        // error!(result, "couldn't recursively mkdir");
-        // error!(result, "couldn't create directory");
-        // error!(result, "mode=0700");
-        // error!(result, format!("path={}", file.display()));
-    }
-
-    #[test]
-    fn recursive_mkdir_slash() {
-        check!(fs::create_dir_all(&Path2::new("/")));
-    }
-
-    // FIXME(#12795) depends on lstat to work on windows
-    #[cfg(not(windows))]
-    #[test]
-    fn recursive_rmdir() {
-        let tmpdir = tmpdir();
-        let d1 = tmpdir.join("d1");
-        let dt = d1.join("t");
-        let dtt = dt.join("t");
-        let d2 = tmpdir.join("d2");
-        let canary = d2.join("do_not_delete");
-        check!(fs::create_dir_all(&dtt));
-        check!(fs::create_dir_all(&d2));
-        check!(check!(File::create(&canary)).write(b"foo"));
-        check!(fs::soft_link(&d2, &dt.join("d2")));
-        check!(fs::remove_dir_all(&d1));
-
-        assert!(!d1.is_dir());
-        assert!(canary.exists());
-    }
-
-    #[test]
-    fn unicode_path_is_dir() {
-        assert!(Path2::new(".").is_dir());
-        assert!(!Path2::new("test/stdtest/fs.rs").is_dir());
-
-        let tmpdir = tmpdir();
-
-        let mut dirpath = tmpdir.path().to_path_buf();
-        dirpath.push(&format!("test-가一ー你好"));
-        check!(fs::create_dir(&dirpath));
-        assert!(dirpath.is_dir());
-
-        let mut filepath = dirpath;
-        filepath.push("unicode-file-\u{ac00}\u{4e00}\u{30fc}\u{4f60}\u{597d}.rs");
-        check!(File::create(&filepath)); // ignore return; touch only
-        assert!(!filepath.is_dir());
-        assert!(filepath.exists());
-    }
-
-    #[test]
-    fn unicode_path_exists() {
-        assert!(Path2::new(".").exists());
-        assert!(!Path2::new("test/nonexistent-bogus-path").exists());
-
-        let tmpdir = tmpdir();
-        let unicode = tmpdir.path();
-        let unicode = unicode.join(&format!("test-각丁ー再见"));
-        check!(fs::create_dir(&unicode));
-        assert!(unicode.exists());
-        assert!(!Path2::new("test/unicode-bogus-path-각丁ー再见").exists());
-    }
-
-    #[test]
-    fn copy_file_does_not_exist() {
-        let from = Path2::new("test/nonexistent-bogus-path");
-        let to = Path2::new("test/other-bogus-path");
-
-        match fs::copy(&from, &to) {
-            Ok(..) => panic!(),
-            Err(..) => {
-                assert!(!from.exists());
-                assert!(!to.exists());
-            }
-        }
-    }
-
-    #[test]
-    fn copy_file_ok() {
-        let tmpdir = tmpdir();
-        let input = tmpdir.join("in.txt");
-        let out = tmpdir.join("out.txt");
-
-        check!(check!(File::create(&input)).write(b"hello"));
-        check!(fs::copy(&input, &out));
-        let mut v = Vec::new();
-        check!(check!(File::open(&out)).read_to_end(&mut v));
-        assert_eq!(v.as_slice(), b"hello");
-
-        assert_eq!(check!(input.metadata()).permissions(),
-                   check!(out.metadata()).permissions());
-    }
-
-    #[test]
-    fn copy_file_dst_dir() {
-        let tmpdir = tmpdir();
-        let out = tmpdir.join("out");
-
-        check!(File::create(&out));
-        match fs::copy(&*out, tmpdir.path()) {
-            Ok(..) => panic!(), Err(..) => {}
-        }
-    }
-
-    #[test]
-    fn copy_file_dst_exists() {
-        let tmpdir = tmpdir();
-        let input = tmpdir.join("in");
-        let output = tmpdir.join("out");
-
-        check!(check!(File::create(&input)).write("foo".as_bytes()));
-        check!(check!(File::create(&output)).write("bar".as_bytes()));
-        check!(fs::copy(&input, &output));
-
-        let mut v = Vec::new();
-        check!(check!(File::open(&output)).read_to_end(&mut v));
-        assert_eq!(v, b"foo".to_vec());
-    }
-
-    #[test]
-    fn copy_file_src_dir() {
-        let tmpdir = tmpdir();
-        let out = tmpdir.join("out");
-
-        match fs::copy(tmpdir.path(), &out) {
-            Ok(..) => panic!(), Err(..) => {}
-        }
-        assert!(!out.exists());
-    }
-
-    #[test]
-    fn copy_file_preserves_perm_bits() {
-        let tmpdir = tmpdir();
-        let input = tmpdir.join("in.txt");
-        let out = tmpdir.join("out.txt");
-
-        let attr = check!(check!(File::create(&input)).metadata());
-        let mut p = attr.permissions();
-        p.set_readonly(true);
-        check!(fs::set_permissions(&input, p));
-        check!(fs::copy(&input, &out));
-        assert!(check!(out.metadata()).permissions().readonly());
-    }
-
-    #[cfg(not(windows))] // FIXME(#10264) operation not permitted?
-    #[test]
-    fn symlinks_work() {
-        let tmpdir = tmpdir();
-        let input = tmpdir.join("in.txt");
-        let out = tmpdir.join("out.txt");
-
-        check!(check!(File::create(&input)).write("foobar".as_bytes()));
-        check!(fs::soft_link(&input, &out));
-        // if cfg!(not(windows)) {
-        //     assert_eq!(check!(lstat(&out)).kind, FileType::Symlink);
-        //     assert_eq!(check!(out.lstat()).kind, FileType::Symlink);
-        // }
-        assert_eq!(check!(fs::metadata(&out)).len(),
-                   check!(fs::metadata(&input)).len());
-        let mut v = Vec::new();
-        check!(check!(File::open(&out)).read_to_end(&mut v));
-        assert_eq!(v, b"foobar".to_vec());
-    }
-
-    #[cfg(not(windows))] // apparently windows doesn't like symlinks
-    #[test]
-    fn symlink_noexist() {
-        let tmpdir = tmpdir();
-        // symlinks can point to things that don't exist
-        check!(fs::soft_link(&tmpdir.join("foo"), &tmpdir.join("bar")));
-        assert_eq!(check!(fs::read_link(&tmpdir.join("bar"))),
-                   tmpdir.join("foo"));
-    }
-
-    #[test]
-    fn readlink_not_symlink() {
-        let tmpdir = tmpdir();
-        match fs::read_link(tmpdir.path()) {
-            Ok(..) => panic!("wanted a failure"),
-            Err(..) => {}
-        }
-    }
-
-    #[test]
-    fn links_work() {
-        let tmpdir = tmpdir();
-        let input = tmpdir.join("in.txt");
-        let out = tmpdir.join("out.txt");
-
-        check!(check!(File::create(&input)).write("foobar".as_bytes()));
-        check!(fs::hard_link(&input, &out));
-        assert_eq!(check!(fs::metadata(&out)).len(),
-                   check!(fs::metadata(&input)).len());
-        assert_eq!(check!(fs::metadata(&out)).len(),
-                   check!(input.metadata()).len());
-        let mut v = Vec::new();
-        check!(check!(File::open(&out)).read_to_end(&mut v));
-        assert_eq!(v, b"foobar".to_vec());
-
-        // can't link to yourself
-        match fs::hard_link(&input, &input) {
-            Ok(..) => panic!("wanted a failure"),
-            Err(..) => {}
-        }
-        // can't link to something that doesn't exist
-        match fs::hard_link(&tmpdir.join("foo"), &tmpdir.join("bar")) {
-            Ok(..) => panic!("wanted a failure"),
-            Err(..) => {}
-        }
-    }
-
-    #[test]
-    fn chmod_works() {
-        let tmpdir = tmpdir();
-        let file = tmpdir.join("in.txt");
-
-        check!(File::create(&file));
-        let attr = check!(fs::metadata(&file));
-        assert!(!attr.permissions().readonly());
-        let mut p = attr.permissions();
-        p.set_readonly(true);
-        check!(fs::set_permissions(&file, p.clone()));
-        let attr = check!(fs::metadata(&file));
-        assert!(attr.permissions().readonly());
-
-        match fs::set_permissions(&tmpdir.join("foo"), p) {
-            Ok(..) => panic!("wanted a panic"),
-            Err(..) => {}
-        }
-    }
-
-    #[test]
-    fn sync_doesnt_kill_anything() {
-        let tmpdir = tmpdir();
-        let path = tmpdir.join("in.txt");
-
-        let mut file = check!(File::create(&path));
-        check!(file.sync_all());
-        check!(file.sync_data());
-        check!(file.write(b"foo"));
-        check!(file.sync_all());
-        check!(file.sync_data());
-    }
-
-    #[test]
-    fn truncate_works() {
-        let tmpdir = tmpdir();
-        let path = tmpdir.join("in.txt");
-
-        let mut file = check!(File::create(&path));
-        check!(file.write(b"foo"));
-        check!(file.sync_all());
-
-        // Do some simple things with truncation
-        assert_eq!(check!(file.metadata()).len(), 3);
-        check!(file.set_len(10));
-        assert_eq!(check!(file.metadata()).len(), 10);
-        check!(file.write(b"bar"));
-        check!(file.sync_all());
-        assert_eq!(check!(file.metadata()).len(), 10);
-
-        let mut v = Vec::new();
-        check!(check!(File::open(&path)).read_to_end(&mut v));
-        assert_eq!(v, b"foobar\0\0\0\0".to_vec());
-
-        // Truncate to a smaller length, don't seek, and then write something.
-        // Ensure that the intermediate zeroes are all filled in (we're seeked
-        // past the end of the file).
-        check!(file.set_len(2));
-        assert_eq!(check!(file.metadata()).len(), 2);
-        check!(file.write(b"wut"));
-        check!(file.sync_all());
-        assert_eq!(check!(file.metadata()).len(), 9);
-        let mut v = Vec::new();
-        check!(check!(File::open(&path)).read_to_end(&mut v));
-        assert_eq!(v, b"fo\0\0\0\0wut".to_vec());
-    }
-
-    #[test]
-    fn open_flavors() {
-        use fs::OpenOptions as OO;
-        fn c<T: Clone>(t: &T) -> T { t.clone() }
-
-        let tmpdir = tmpdir();
-
-        let mut r = OO::new(); r.read(true);
-        let mut w = OO::new(); w.write(true);
-        let mut rw = OO::new(); rw.write(true).read(true);
-
-        match r.open(&tmpdir.join("a")) {
-            Ok(..) => panic!(), Err(..) => {}
-        }
-
-        // Perform each one twice to make sure that it succeeds the second time
-        // (where the file exists)
-        check!(c(&w).create(true).open(&tmpdir.join("b")));
-        assert!(tmpdir.join("b").exists());
-        check!(c(&w).create(true).open(&tmpdir.join("b")));
-        check!(w.open(&tmpdir.join("b")));
-
-        check!(c(&rw).create(true).open(&tmpdir.join("c")));
-        assert!(tmpdir.join("c").exists());
-        check!(c(&rw).create(true).open(&tmpdir.join("c")));
-        check!(rw.open(&tmpdir.join("c")));
-
-        check!(c(&w).append(true).create(true).open(&tmpdir.join("d")));
-        assert!(tmpdir.join("d").exists());
-        check!(c(&w).append(true).create(true).open(&tmpdir.join("d")));
-        check!(c(&w).append(true).open(&tmpdir.join("d")));
-
-        check!(c(&rw).append(true).create(true).open(&tmpdir.join("e")));
-        assert!(tmpdir.join("e").exists());
-        check!(c(&rw).append(true).create(true).open(&tmpdir.join("e")));
-        check!(c(&rw).append(true).open(&tmpdir.join("e")));
-
-        check!(c(&w).truncate(true).create(true).open(&tmpdir.join("f")));
-        assert!(tmpdir.join("f").exists());
-        check!(c(&w).truncate(true).create(true).open(&tmpdir.join("f")));
-        check!(c(&w).truncate(true).open(&tmpdir.join("f")));
-
-        check!(c(&rw).truncate(true).create(true).open(&tmpdir.join("g")));
-        assert!(tmpdir.join("g").exists());
-        check!(c(&rw).truncate(true).create(true).open(&tmpdir.join("g")));
-        check!(c(&rw).truncate(true).open(&tmpdir.join("g")));
-
-        check!(check!(File::create(&tmpdir.join("h"))).write("foo".as_bytes()));
-        check!(r.open(&tmpdir.join("h")));
-        {
-            let mut f = check!(r.open(&tmpdir.join("h")));
-            assert!(f.write("wut".as_bytes()).is_err());
-        }
-        assert_eq!(check!(fs::metadata(&tmpdir.join("h"))).len(), 3);
-        {
-            let mut f = check!(c(&w).append(true).open(&tmpdir.join("h")));
-            check!(f.write("bar".as_bytes()));
-        }
-        assert_eq!(check!(fs::metadata(&tmpdir.join("h"))).len(), 6);
-        {
-            let mut f = check!(c(&w).truncate(true).open(&tmpdir.join("h")));
-            check!(f.write("bar".as_bytes()));
-        }
-        assert_eq!(check!(fs::metadata(&tmpdir.join("h"))).len(), 3);
-    }
-
-    #[test]
-    fn utime() {
-        let tmpdir = tmpdir();
-        let path = tmpdir.join("a");
-        check!(File::create(&path));
-        // These numbers have to be bigger than the time in the day to account
-        // for timezones Windows in particular will fail in certain timezones
-        // with small enough values
-        check!(fs::set_file_times(&path, 100000, 200000));
-        assert_eq!(check!(path.metadata()).accessed(), 100000);
-        assert_eq!(check!(path.metadata()).modified(), 200000);
-    }
-
-    #[test]
-    fn utime_noexist() {
-        let tmpdir = tmpdir();
-
-        match fs::set_file_times(&tmpdir.join("a"), 100, 200) {
-            Ok(..) => panic!(),
-            Err(..) => {}
-        }
-    }
-
-    #[test]
-    fn binary_file() {
-        let mut bytes = [0; 1024];
-        StdRng::new().ok().unwrap().fill_bytes(&mut bytes);
-
-        let tmpdir = tmpdir();
-
-        check!(check!(File::create(&tmpdir.join("test"))).write(&bytes));
-        let mut v = Vec::new();
-        check!(check!(File::open(&tmpdir.join("test"))).read_to_end(&mut v));
-        assert!(v == bytes.as_slice());
-    }
-
-    #[test]
-    fn unlink_readonly() {
-        let tmpdir = tmpdir();
-        let path = tmpdir.join("file");
-        check!(File::create(&path));
-        let mut perm = check!(fs::metadata(&path)).permissions();
-        perm.set_readonly(true);
-        check!(fs::set_permissions(&path, perm));
-        check!(fs::remove_file(&path));
-    }
-}