type nErr struct {
		n   int64
		err error
	}
	type justReader struct {
		io.Reader
	}
	type justWriter struct {
		io.Writer
	}
	discard := justWriter{io.Discard} // hide ReadFrom

	var with, withOut nErr
	with.n, with.err = io.Copy(discard, NewReader(nil))
	withOut.n, withOut.err = io.Copy(discard, justReader{NewReader(nil)})
	if with != withOut {

pkg syscall (windows-386), const STD_OUTPUT_HANDLE = -11
pkg syscall (windows-386), const SUBLANG_ENGLISH_US = 1
pkg syscall (windows-386), const SW_FORCEMINIMIZE = 11
pkg syscall (windows-386), const SW_HIDE = 0
pkg syscall (windows-386), const SW_MAXIMIZE = 3
pkg syscall (windows-386), const SW_MINIMIZE = 6
pkg syscall (windows-386), const SW_NORMAL = 1
pkg syscall (windows-386), const SW_RESTORE = 9

// or support for sparse files.
//
// The Writer currently provides no support for sparse files.
type Format int

// Constants to identify various tar formats.
const (
	// Deliberately hide the meaning of constants from public API.
	_ Format = (1 << iota) / 4 // Sequence of 0, 0, 1, 2, 4, 8, etc...

	// FormatUnknown indicates that the format is unknown.
	FormatUnknown

pkg syscall (windows-386), const STD_OUTPUT_HANDLE ideal-int
pkg syscall (windows-386), const SUBLANG_ENGLISH_US ideal-int
pkg syscall (windows-386), const SW_FORCEMINIMIZE ideal-int
pkg syscall (windows-386), const SW_HIDE ideal-int
pkg syscall (windows-386), const SW_MAXIMIZE ideal-int
pkg syscall (windows-386), const SW_MINIMIZE ideal-int
pkg syscall (windows-386), const SW_NORMAL ideal-int