break
				}
				// Fall through in the unlikely case
				// that filter at some point is
				// "Pid:\t".
			}
			if strings.HasPrefix(line, filter) {
				if line == expected {
					foundAThread = true
					break
				}
				if filter == "Groups:" && strings.HasPrefix(line, "Groups:\t") {
					// https://github.com/golang/go/issues/46145

func unsetEnv(cmd *exec.Cmd, key string) {
	cmd.Env = cmd.Environ()

	prefix := key + "="
	newEnv := []string{}
	for _, entry := range cmd.Env {
		if strings.HasPrefix(entry, prefix) {
			continue
		}
		newEnv = append(newEnv, entry)
		// key may appear multiple times, so keep going.
	}
	cmd.Env = newEnv

		line = bytes.TrimSpace(line)
		if v, ok := parseKey(line, key); ok {
			return v
		}
	}
	return ""
}

func parseKey(line []byte, key string) (string, bool) {
	if !strings.HasPrefix(string(line), key) {
		return "", false
	}
	s := strings.TrimPrefix(string(line), key)
	if len(s) == 0 || (s[0] != ' ' && s[0] != '\t') {
		return "", false
	}
	s, _, _ = strings.Cut(s, "//") // strip comments

	}()

	rev, err := module.PseudoVersionRev(version)
	if err != nil {
		return err
	}
	if rev != info.Short {
		switch {
		case strings.HasPrefix(rev, info.Short):
			return fmt.Errorf("revision is longer than canonical (expected %s)", info.Short)
		case strings.HasPrefix(info.Short, rev):
			return fmt.Errorf("revision is shorter than canonical (expected %s)", info.Short)
		default:

	}
	xatexit(rmworkdir)

	tooldir = pathf("%s/pkg/tool/%s_%s", goroot, gohostos, gohostarch)

	goversion := findgoversion()
	isRelease = strings.HasPrefix(goversion, "release.") || strings.HasPrefix(goversion, "go")
}

// compilerEnv returns a map from "goos/goarch" to the
// compiler setting to use for that platform.

	var env []string
	for _, e := range os.Environ() {
		// Don't override TMPDIR, HOME, GOCACHE on the device.
		if strings.HasPrefix(e, "TMPDIR=") || strings.HasPrefix(e, "HOME=") || strings.HasPrefix(e, "GOCACHE=") {
			continue
		}
		env = append(env, e)
	}
	lldb := exec.Command(
		"python",
		"-", // Read script from stdin.
		target,
		appdir,
		deviceapp,

		return false
	}
	for _, goSums := range goSum.w {
		for _, h := range goSums[mod] {
			if !strings.HasPrefix(h, "h1:") {
				continue
			}
			if !goSum.status[modSum{mod, h}].dirty {
				return true
			}
		}
	}
	for _, h := range goSum.m[mod] {
		if !strings.HasPrefix(h, "h1:") {
			continue
		}
		if !goSum.status[modSum{mod, h}].dirty {
			return true
		}
	}
	return false

			continue
		}
		// In module mode, this package has a fully-qualified import path.
		// Remove it if present.
		fname = strings.TrimPrefix(fname, "cmd/cgo/internal/")
		if !strings.HasPrefix(fname, "test.") {
			continue
		}
		got = append(got, fname)
	}
	if !reflect.DeepEqual(want, got) {
		t.Errorf("incorrect backtrace:\nwant:\t%v\ngot:\t%v", want, got)
	}

	lines := strings.SplitAfter(string(data), "\n")
Diff:
	for _, line := range lines {
		lineno++

		// Ignore include of textflag.h.
		if strings.HasPrefix(line, "#include ") {
			continue
		}

		// Ignore GLOBL.
		if strings.HasPrefix(line, "GLOBL ") {
			continue
		}

		// The general form of a test input line is:
		//	// comment
		//	INST args [// printed form] [// hex encoding]

		Time:    tm,
		Version: rev,
	}
	return info, nil
}

func fossilParseStat(rev, out string) (*RevInfo, error) {
	for _, line := range strings.Split(out, "\n") {
		if strings.HasPrefix(line, "uuid:") || strings.HasPrefix(line, "hash:") {
			f := strings.Fields(line)
			if len(f) != 5 || len(f[1]) != 40 || f[4] != "UTC" {
				return nil, vcsErrorf("unexpected response from fossil info: %q", line)
			}