_ Error = InvalidAddrError("")
		_ Error = &timeoutError{}
		_ Error = &DNSConfigError{}
		_ Error = &DNSError{}
	)

	// ErrClosed was introduced as type error, so we can't check
	// it using a declaration.
	if _, ok := ErrClosed.(Error); !ok {
		t.Fatal("ErrClosed does not implement Error")
	}

	} else if pe, ok := err.(*fs.PathError); !ok {
		t.Errorf("I/O on closed pipe returned unexpected error type %T; expected fs.PathError", pe)
	} else if pe.Err != fs.ErrClosed {
		t.Errorf("got error %q but expected %q", pe.Err, fs.ErrClosed)
	} else {
		t.Logf("I/O returned expected error %q", err)
	}
}

func TestClosedPipeRaceRead(t *testing.T) {
	testClosedPipeRace(t, true)
}

// error and return a [DNSError] for which Temporary returns false.
func (e *DNSError) Temporary() bool { return e.IsTimeout || e.IsTemporary }

// errClosed exists just so that the docs for ErrClosed don't mention
// the internal package poll.
var errClosed = poll.ErrNetClosing

// ErrClosed is the error returned by an I/O call on a network
// connection that has already been closed, or that is closed by

			// Abort the Fetch request.
			ac.Call("abort")
		}
		return nil, req.Context().Err()
	case resp := <-respCh:
		return resp, nil
	case err := <-errCh:
		return nil, err
	}
}

var errClosed = errors.New("net/http: reader is closed")

// streamReader implements an io.ReadCloser wrapper for ReadableStream.
// See https://fetch.spec.whatwg.org/#readablestream for more information.
type streamReader struct {

		}
	}
	// Flush pending output.
	r.toRead = r.output[:r.o]
	r.o = 0
}

var errClosed = errors.New("lzw: reader/writer is closed")

// Close closes the [Reader] and returns an error for any future read operation.
// It does not close the underlying [io.Reader].
func (r *Reader) Close() error {
	r.err = errClosed // in case any Reads come along
	return nil
}

		ok       bool
	)
	expired := ffd.readDeadline.Load().expired
	select {
	case <-expired:
		return nil, os.ErrDeadlineExceeded
	case incoming, ok = <-ffd.incoming:
		if !ok {
			return nil, ErrClosed
		}
		select {
		case <-expired:
			ffd.incoming <- incoming
			return nil, os.ErrDeadlineExceeded
		default:
		}
	case incoming, ok = <-ffd.incomingFull:
		select {
		case <-expired:

	// stdout to close. Wait closes the read/parent end of stdout, so
	// starting this goroutine prior to io.ReadAll introduces a race
	// condition where ReadAll may get fs.ErrClosed if the child exits too
	// quickly.
	waiting = true
	go func() {
		doneCh <- cmd.Wait()
		close(doneCh)
	}()

	// Wait for an arbitrary timeout longer than one second. The subprocess itself

// Close may be called multiple times; all calls after the first will return a
// non-nil error.
func (f *File) Close() error {
	if f.closed {
		return &fs.PathError{
			Op:   "close",
			Path: f.Name(),
			Err:  fs.ErrClosed,
		}
	}
	f.closed = true

	err := closeFile(f.osFile.File)
	runtime.SetFinalizer(f, nil)
	return err
}

// Read opens the named file with a read-lock and returns its contents.

// be canceled and return immediately with an ErrClosed error.
// Close will return an error if it has already been called.
func (f *File) Close() error {
	if f == nil {
		return ErrInvalid
	}
	return f.file.close()
}

func (file *file) close() error {
	if !file.fdmu.IncrefAndClose() {
		return &PathError{Op: "close", Path: file.name, Err: ErrClosed}
	}

		t.Error(err)
	}
	time.Sleep(10 * time.Millisecond)
	cancel()
	wg.Wait()
	ln.Close()

	c, err = ln.Accept()
	if !errors.Is(err, ErrClosed) {
		if err == nil {
			c.Close()
		}
		t.Errorf("after l.Close(), l.Accept() = _, %v\nwant %v", err, ErrClosed)
	}