code: @Beta
    @Deprecated
    public
    static HashCode hash(File file, HashFunction hashFunction) throws IOException {
      return asByteSource(file).hash(hashFunction);
    }
docs: Computes the hash code of the {@code file} using {@code hashFunction}.
  
  @param file the file to read
  @param hashFunction the hash function to use to hash the data
  @return the {@link HashCode} of all of the bytes in the file
  @throws IOException if an I/O error occurs
  @since 12.0
  @deprecated Prefer {@code asByteSource(file).hash(hashFunction)}. This method is scheduled to
  be removed in January 2019.