go func() {
			defer wg.Done()
			_ = NewWalker(context, filepath.Join(testenv.GOROOT(nil), "src"))
		}()
	}
	wg.Wait()
})

func TestIssue21181(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping with -short")
	}
	if *flagCheck {
		// slow, not worth repeating in -check
		t.Skip("skipping with -check set")
	}
	testenv.MustHaveGoBuild(t)

	warmupCache()

package cgotest

import (
	"bytes"
	"crypto/md5"
	"os"
	"os/exec"
	"runtime"
	"syscall"
	"testing"
	"time"
)

func test18146(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping in short mode")
	}

	if runtime.GOOS == "darwin" || runtime.GOOS == "ios" {
		t.Skipf("skipping flaky test on %s; see golang.org/issue/18202", runtime.GOOS)
	}

		if err != io.EOF {
			t.Errorf("ReadByte: got (%q, %v), want (%q, %v)", c, err, byte(0), io.EOF)
		}
	}
}

func TestLargeStringWrites(t *testing.T) {
	var buf Buffer
	limit := 30
	if testing.Short() {
		limit = 9
	}
	for i := 3; i < limit; i += 3 {
		s := fillString(t, "TestLargeWrites (1)", &buf, "", 5, testString)
		empty(t, "TestLargeStringWrites (2)", &buf, s, make([]byte, len(testString)/i))
	}

inside a <a href="#Function_declarations">function body</a> if the variable is
never used.
</p>

<h3 id="Short_variable_declarations">Short variable declarations</h3>

<p>
A <i>short variable declaration</i> uses the syntax:
</p>

<pre class="ebnf">
ShortVarDecl = IdentifierList ":=" ExpressionList .
</pre>

<p>

appropriate padding to reach the next field or the end of the struct.

The standard C numeric types are available under the names
C.char, C.schar (signed char), C.uchar (unsigned char),
C.short, C.ushort (unsigned short), C.int, C.uint (unsigned int),
C.long, C.ulong (unsigned long), C.longlong (long long),
C.ulonglong (unsigned long long), C.float, C.double,
C.complexfloat (complex float), and C.complexdouble (complex double).

		var f File
		err := readDirectoryHeader(&f, strings.NewReader(s))
		if err != nil {
			t.Errorf("error reading #%d: %v", i, err)
		}
	}
}

// Verify we return ErrUnexpectedEOF when length is short.
func TestIssue10957(t *testing.T) {
	data := []byte("PK\x03\x040000000PK\x01\x0200000" +
		"0000000000000000000\x00" +
		"\x00\x00\x00\x00\x00000000000000PK\x01" +
		"\x020000000000000000000" +

	"errors"
	"fmt"
	"hash"
	"internal/testenv"
	"io"
	"runtime"
	"sort"
	"strings"
	"testing"
	"time"
)

func TestOver65kFiles(t *testing.T) {
	if testing.Short() && testenv.Builder() == "" {
		t.Skip("skipping in short mode")
	}
	buf := new(strings.Builder)
	w := NewWriter(buf)
	const nFiles = (1 << 16) + 42
	for i := 0; i < nFiles; i++ {
		_, err := w.CreateHeader(&FileHeader{

inside a <a href="#Function_declarations">function body</a> if the variable is
never used.
</p>

<h3 id="Short_variable_declarations">Short variable declarations</h3>

<p>
A <i>short variable declaration</i> uses the syntax:
</p>

<pre class="ebnf">
ShortVarDecl = IdentifierList ":=" ExpressionList .
</pre>

<p>

pkg syscall, const IPPROTO_UDP = 17
pkg syscall, const O_RDONLY = 0
pkg syscall, const O_RDWR = 2
pkg syscall, const O_WRONLY = 1
pkg syscall, const SHUT_RD = 0
pkg syscall, const SHUT_RDWR = 2
pkg syscall, const SHUT_WR = 1
pkg syscall, const SIGABRT = 6
pkg syscall, const SIGALRM = 14
pkg syscall, const SIGFPE = 8
pkg syscall, const SIGHUP = 1
pkg syscall, const SIGILL = 4

  + The part after the colon uses the verb tense + phrase that completes the blank in,
    "This change modifies Go to ___________"
  + Lowercase verb after the colon
  + No trailing period
  + Keep the title as short as possible. ideally under 76 characters or shorter
+ No Markdown
+ The first PR comment (this one) is wrapped at 76 characters, unless it's
  really needed (ASCII art, table, or long link)