message: Remove unused 'file' function.
diff: @@ -2,7 +2,6 @@ use std::env;
  use std::ffi::{OsStr, OsString};
  use std::fs::File;
  use std::fs::OpenOptions;
  -use std::io;
  use std::io::prelude::*;
  use std::path::{Path, PathBuf, Component};
  @@ -68,10 +67,6 @@ pub fn without_prefix<'a>(a: &'a Path, b: &'a Path) -> Option<&'a Path> {
  }
  }
  -pub fn file(p: &Path, contents: &[u8]) -> io::Result<()> {
  - try!(File::create(p)).write_all(contents)
  -}
  -
  pub fn read(path: &Path) -> CargoResult<String> {
  (|| -> CargoResult<_> {
  let mut ret = String::new();
  