func TestCopyReadErrWriteErr(t *testing.T) {
	er, ew := errors.New("readError"), errors.New("writeError")
	r, w := zeroErrReader{err: er}, errWriter{err: ew}
	n, err := Copy(w, r)
	if n != 0 || err != ew {
		t.Errorf("Copy(zeroErrReader, errWriter) = %d, %v; want 0, writeError", n, err)
	}
}

func TestCopyN(t *testing.T) {
	rb := new(Buffer)
	wb := new(Buffer)

		{"NoCompression", Const, 0},
		{"ReadError", Type, 0},
		{"ReadError.Err", Field, 0},
		{"ReadError.Offset", Field, 0},
		{"Reader", Type, 0},
		{"Resetter", Type, 4},
		{"WriteError", Type, 0},
		{"WriteError.Err", Field, 0},
		{"WriteError.Offset", Field, 0},
		{"Writer", Type, 0},
	},
	"compress/gzip": {
		{"(*Reader).Close", Method, 0},
		{"(*Reader).Multistream", Method, 4},
		{"(*Reader).Read", Method, 0},

pkg archive/zip, type FileHeader struct, ModifiedTime //deprecated
pkg archive/zip, type FileHeader struct, UncompressedSize //deprecated
pkg compress/flate, type ReadError //deprecated
pkg compress/flate, type WriteError //deprecated
pkg crypto/rc4, method (*Cipher) Reset //deprecated
pkg crypto/tls, const VersionSSL30 //deprecated
pkg crypto/tls, method (*Config) BuildNameToCertificate //deprecated

pkg compress/flate, type Reader interface, Read([]uint8) (int, error)
pkg compress/flate, type Reader interface, ReadByte() (uint8, error)
pkg compress/flate, type WriteError struct
pkg compress/flate, type WriteError struct, Err error
pkg compress/flate, type WriteError struct, Offset int64
pkg compress/flate, type Writer struct
pkg compress/gzip, const BestCompression ideal-int
pkg compress/gzip, const BestSpeed ideal-int