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)
	}

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

		// 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)

	}

	for i, tt := range tests {
		pos, err := r.Seek(tt.off, tt.seek)
		if err == nil && tt.seekerr != "" {
			t.Errorf("%d. want seek error %q", i, tt.seekerr)
			continue
		}
		if err != nil && err.Error() != tt.seekerr {
			t.Errorf("%d. seek error = %q; want %q", i, err.Error(), tt.seekerr)
			continue
		}
		if tt.wantpos != 0 && tt.wantpos != pos {
			t.Errorf("%d. pos = %d, want %d", i, pos, tt.wantpos)

): String? = headers[name] ?: defaultValue

@Throws(IOException::class)
fun Response.commonPeekBody(byteCount: Long): ResponseBody {
  val peeked = body.source().peek()
  val buffer = Buffer()
  peeked.request(byteCount)
  buffer.write(peeked, minOf(byteCount, peeked.buffer.size))
  return buffer.asResponseBody(body.contentType(), buffer.size)
}

fun Response.commonNewBuilder(): Response.Builder = Response.Builder(this)

	var b1 B1[T]
	b1.A1 = &A1[T]{}
	b1.A2 = &ImpA2[T]{}

	b1.A1.m1(arg)
	b1.m1(arg)

	b1.A2.m2(arg)
	b1.m2(arg)

	var b2 B2[T]
	b2 = &ImpA2[T]{}
	b2.m2(arg)

	// a deeper nesting
	var d D[T]
	d.C.B1.A1 = &A1[T]{}
	d.C.B1.A2 = &ImpA2[T]{}
	d.m1(arg)
	d.m2(arg)

	// calling method expressions
	m1x := B1[T].m1
	m1x(b1, arg)
	// TODO(khr): reenable these.
	//m2x := B2[T].m2

			return 0, nil, true
		}
	}
	// r might be an *os.File or an os.fileWithoutWriteTo.
	// Type assert to an interface rather than *os.File directly to handle the latter case.
	f, ok := r.(interface {
		fs.File
		io.Seeker
		syscall.Conn
	})
	if !ok {
		return 0, nil, false
	}

	if remain == 0 {
		fi, err := f.Stat()
		if err != nil {
			return 0, err, false
		}

		remain = fi.Size()
	}

import com.google.common.annotations.J2ktIncompatible;

/**
 * Modes for opening a file for writing. The default when mode when none is specified is to truncate
 * the file before writing.
 *
 * @author Colin Decker
 */
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault
public enum FileWriteMode {
  /** Specifies that writes to the opened file should append to the end of the file. */
  APPEND

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;

/**
 * A char source for testing that has configurable options.
 *
 * @author Colin Decker
 */
public class TestCharSource extends CharSource implements TestStreamSupplier {

  private final TestByteSource byteSource;

  public TestCharSource(String content, TestOption... options) {