throws Exception {
                    closer.eventuallyClose(closeable1, closingExecutor);
                    assertThat(peeker.getDone(input1)).isSameInstanceAs("value1");
                    try {
                      peeker.getDone(input2Failed);
                      fail("Peeker should fail for failed inputs");

                      throws Exception {
                    closer.eventuallyClose(closeable1, closingExecutor);
                    assertThat(peeker.getDone(input1)).isSameInstanceAs("value1");
                    try {
                      peeker.getDone(input2Failed);
                      fail("Peeker should fail for failed inputs");

            public U call(DeferredCloser closer, Peeker peeker) throws Exception {
              return function.apply(
                  closer,
                  peeker.getDone(future1),
                  peeker.getDone(future2),
                  peeker.getDone(future3),
                  peeker.getDone(future4),
                  peeker.getDone(future5));
            }

            @Override

            public U call(DeferredCloser closer, Peeker peeker) throws Exception {
              return function.apply(
                  closer,
                  peeker.getDone(future1),
                  peeker.getDone(future2),
                  peeker.getDone(future3),
                  peeker.getDone(future4),
                  peeker.getDone(future5));
            }

            @Override

		return ret
	}
	return seekerReadAt{rs}
}

type seekerReadAt struct {
	seeker io.ReadSeeker
}

func (sra seekerReadAt) ReadAt(p []byte, off int64) (int, error) {
	if _, err := sra.seeker.Seek(off, io.SeekStart); err != nil {
		return 0, err
	}
	return sra.seeker.Read(p)

	n, err = file.Read(buf[:])
	if err != io.EOF {
		t.Fatal("Read:", err)
	}
	if n != 0 {
		t.Fatal("Read:", n)
	}

	// Use seek to get the offset at the EOF.
	seeker := file.(io.Seeker)
	off, err := seeker.Seek(0, io.SeekCurrent)
	if err != nil {
		t.Fatal("Seek:", err)
	}
	if off != int64(len(want)) {
		t.Fatal("Seek:", off)
	}

		return nil
	}

	if seeker, ok := r.r.(io.Seeker); ok {
		r.blockOffset += int64(relativeOffset)
		// Implementations of Seeker do not always detect invalid offsets,
		// so check that the new offset is valid by comparing to the end.
		prev, err := seeker.Seek(0, io.SeekCurrent)
		if err != nil {
			return r.wrapError(0, err)
		}
		end, err := seeker.Seek(0, io.SeekEnd)
		if err != nil {

package strings

import (
	"errors"
	"io"
	"unicode/utf8"
)

// A Reader implements the [io.Reader], [io.ReaderAt], [io.ByteReader], [io.ByteScanner],
// [io.RuneReader], [io.RuneScanner], [io.Seeker], and [io.WriterTo] interfaces by reading
// from a string.
// The zero value for Reader operates like a Reader of an empty string.
type Reader struct {
	s        string
	i        int64 // current reading index

// served by the [FileServer] implementation.
//
// The methods should behave the same as those on an [*os.File].
type File interface {
	io.Closer
	io.Reader
	io.Seeker
	Readdir(count int) ([]fs.FileInfo, error)
	Stat() (fs.FileInfo, error)
}

type anyDirs interface {
	len() int
	name(i int) string
	isDir(i int) bool
}

type fileInfoDirs []fs.FileInfo

		// Restore stdout, get output and remove temporary file.
		os.Stdout = stdout
		var buf strings.Builder
		_, seekErr := f.Seek(0, io.SeekStart)
		_, readErr := io.Copy(&buf, f)
		out := buf.String()
		f.Close()
		os.Remove(f.Name())
		if seekErr != nil {
			fmt.Fprintf(os.Stderr, "testing: seek temp file: %v\n", seekErr)
			os.Exit(1)
		}
		if readErr != nil {
			fmt.Fprintf(os.Stderr, "testing: read temp file: %v\n", readErr)