if err := f.SetDeadline(deadline); err != os.ErrNoDeadline {
		t.Errorf("SetDeadline on file returned %v, wanted %v", err, os.ErrNoDeadline)
	}
	if err := f.SetReadDeadline(deadline); err != os.ErrNoDeadline {
		t.Errorf("SetReadDeadline on file returned %v, wanted %v", err, os.ErrNoDeadline)
	}
	if err := f.SetWriteDeadline(deadline); err != os.ErrNoDeadline {

	if err := f.checkValid("SetDeadline"); err != nil {
		return err
	}
	return poll.ErrNoDeadline
}

// setReadDeadline sets the read deadline.
func (f *File) setReadDeadline(time.Time) error {
	if err := f.checkValid("SetReadDeadline"); err != nil {
		return err
	}
	return poll.ErrNoDeadline
}

// setWriteDeadline sets the write deadline.
func (f *File) setWriteDeadline(time.Time) error {

pkg os, method (*File) SetReadDeadline(time.Time) error
pkg os, method (*File) SetWriteDeadline(time.Time) error
pkg os, method (*PathError) Timeout() bool
pkg os, method (*SyscallError) Timeout() bool
pkg os, var ErrNoDeadline error
pkg strings, method (*Builder) Grow(int)
pkg strings, method (*Builder) Len() int
pkg strings, method (*Builder) Reset()
pkg strings, method (*Builder) String() string

// It is equivalent to calling both SetReadDeadline and SetWriteDeadline.
//
// Only some kinds of files support setting a deadline. Calls to SetDeadline
// for files that do not support deadlines will return ErrNoDeadline.
// On most systems ordinary files do not support deadlines, but pipes do.
//
// A deadline is an absolute time after which I/O operations fail with an