message: Clarify comment and use qualified import for the flag
diff: @@ -23,11 +23,6 @@ use std::sync::RwLock;
  use std::sync::Weak;
  use tempdir::TempDir;
  -#[cfg(windows)]
  -use winapi::winbase::FILE_FLAG_BACKUP_SEMANTICS;
  -
  -
  -
  fn open_mmap(full_path: &PathBuf) -> result::Result<Option<Arc<Mmap>>, FileError> {
  let convert_file_error = |err: io::Error| {
  if err.kind() == io::ErrorKind::NotFound {
  @@ -226,8 +221,8 @@ impl MmapDirectory {
  fn sync_directory(&self) -> Result<(), io::Error> {
  let mut open_opts = OpenOptions::new();
  - // Linux needs read to be set, or otherwise returns EINVAL
  - // and fails with EISDIR if write is set
  + // Linux needs read to be set, otherwise returns EINVAL
  + // write must not be set, or it fails with EISDIR
  open_opts.read(true);
  // On Windows, opening a directory requires FILE_FLAG_BACKUP_SEMANTICS
  @@ -235,8 +230,10 @@ impl MmapDirectory {
  #[cfg(windows)]
  {
  use std::os::windows::fs::OpenOptionsExt;
  + use winapi::winbase;
  +
  open_opts.write(true)
  - .custom_flags(FILE_FLAG_BACKUP_SEMANTICS);
  + .custom_flags(winbase::FILE_FLAG_BACKUP_SEMANTICS);
  }
  let fd = try!(open_opts.open(&self.root_path));
  