commandLine = append(commandLine, ' ')
		// TODO(bcmills): since we're already appending to a slice, it would be nice
		// to avoid the intermediate allocations of EscapeArg.
		// Perhaps we can factor out an appendEscapedArg function.
		commandLine = append(commandLine, EscapeArg(arg)...)
	}
	return string(commandLine)
}

// DecomposeCommandLine breaks apart its argument command line into unescaped parts using CommandLineToArgv,

		{`\\server\share\file`, `\\server\share\file`},
		{`\\newserver\tempshare\really.txt`, `\\newserver\tempshare\really.txt`},
	}
	for _, test := range tests {
		if got := syscall.EscapeArg(test.input); got != test.output {
			t.Errorf("EscapeArg(%#q) = %#q, want %#q", test.input, got, test.output)
		}
	}
}

func TestChangingProcessParent(t *testing.T) {
	if os.Getenv("GO_WANT_HELPER_PROCESS") == "parent" {

func EscapeArg(s string) string {
	if len(s) == 0 {
		return `""`
	}
	for i := 0; i < len(s); i++ {
		switch s[i] {
		case '"', '\\', ' ', '\t':
			// Some escaping required.
			b := make([]byte, 0, len(s)+2)
			b = appendEscapeArg(b, s)
			return string(b)
		}
	}
	return s
}

// appendEscapeArg escapes the string s, as per escapeArg,

	for _, cmd := range cmds {
		compareCommandLineToArgvWithSyscall(t, "test"+cmd)
		compareCommandLineToArgvWithSyscall(t, `"cmd line"`+cmd)
		compareCommandLineToArgvWithSyscall(t, exe+cmd)

		// test both syscall.EscapeArg and os.commandLineToArgv
		args := os.CommandLineToArgv(exe + cmd)
		out, err := testenv.Command(t, args[0], args[1:]...).CombinedOutput()
		if err != nil {
			t.Fatalf("running %q failed: %v\n%v", args, err, string(out))

		{"EpollEvent.Events", Field, 0},
		{"EpollEvent.Fd", Field, 0},
		{"EpollEvent.Pad", Field, 0},
		{"EpollEvent.PadFd", Field, 0},
		{"EpollWait", Func, 0},
		{"Errno", Type, 0},
		{"EscapeArg", Func, 0},
		{"Exchangedata", Func, 0},
		{"Exec", Func, 0},
		{"Exit", Func, 0},
		{"ExitProcess", Func, 0},
		{"FD_CLOEXEC", Const, 0},
		{"FD_SETSIZE", Const, 0},

pkg syscall (windows-386), func DnsRecordListFree(*DNSRecord, uint32)
pkg syscall (windows-386), func DuplicateHandle(Handle, Handle, Handle, *Handle, uint32, bool, uint32) error
pkg syscall (windows-386), func EscapeArg(string) string
pkg syscall (windows-386), func ExitProcess(uint32)
pkg syscall (windows-386), func Fchdir(Handle) error
pkg syscall (windows-386), func Fchmod(Handle, uint32) error