"slices"
	"strings"
	"time"
)

// Writer provides sequential writing of a tar archive.
// [Writer.WriteHeader] begins a new file with the provided [Header],
// and then Writer can be treated as an io.Writer to supply that file's data.
type Writer struct {
	w    io.Writer
	pad  int64      // Amount of padding to write after current file entry
	curr fileWriter // Writer for current file entry

	return tags, nil
}

// repoSum returns a checksum of the entire repo state,
// which can be checked (as Origin.RepoSum) to cache
// the absence of a specific module version.
// The caller must supply refs, the result of a successful r.loadRefs.
func (r *gitRepo) repoSum(refs map[string]string) string {
	var list []string
	for ref := range refs {
		list = append(list, ref)
	}
	sort.Strings(list)

	actionID cache.ActionID // cache ID of action input
	buildID  string         // build ID of action output

	VetxOnly  bool       // Mode=="vet": only being called to supply info about dependencies
	needVet   bool       // Mode=="build": need to fill in vet config
	needBuild bool       // Mode=="build": need to do actual build (can be false if needVet is true)
	vetCfg    *vetConfig // vet config

			if p.ImportPath == "runtime/cgo" && strings.HasPrefix(sfile, "gcc_") {
				continue
			}
			op, _ := fsys.OverlayPath(mkAbs(p.Dir, sfile))
			args = append(args, op)
		}

		// Supply an empty go_asm.h as if the compiler had been run.
		// -gensymabis parsing is lax enough that we don't need the
		// actual definitions that would appear in go_asm.h.

	c.Cancel = func() error { return c.Process.Signal(os.Interrupt) }
	c.Dir = dir
	c.Stdin = stdin
	c.Stderr = &stderr
	c.Stdout = &stdout
	// For Git commands, manually supply GIT_DIR so Git works with safe.bareRepository=explicit set. Noop for other commands.
	c.Env = append(c.Environ(), "GIT_DIR="+dir)
	err := c.Run()
	if err != nil {

		testenv.MustHaveGoBuild(t) // Really just 'go tool cgo', but close enough.

		// The reportCgoError hook is global, so we can't set it per-test
		// if we want to be able to run those tests in parallel.
		// Instead, simply set it to panic on error: the goroutine dump
		// from the panic should help us determine which test failed.
		prevReportCgoError := reportCgoError
		reportCgoError = func(err error) {

		a.apply(n, "X", nil, n.X)
		a.applyList(n, "Indices")

	case *ast.SliceExpr:
		a.apply(n, "X", nil, n.X)
		a.apply(n, "Low", nil, n.Low)
		a.apply(n, "High", nil, n.High)
		a.apply(n, "Max", nil, n.Max)

	case *ast.TypeAssertExpr:
		a.apply(n, "X", nil, n.X)
		a.apply(n, "Type", nil, n.Type)

	case *ast.CallExpr:
		a.apply(n, "Fun", nil, n.Fun)
		a.applyList(n, "Args")

	case *ast.StarExpr:

		}
		return stacks.profile(), nil
	}
}

// pprofOverlappingDuration returns the overlapping duration between
// the time intervals in gToIntervals and the specified event.
// If gToIntervals is nil, this simply returns the event's duration.
func pprofOverlappingDuration(gToIntervals map[trace.GoID][]interval, id trace.GoID, sample interval) time.Duration {
	if gToIntervals == nil { // No filtering.
		return sample.duration()
	}

// - CLDR coverage levels.
// - Set of common tags defined in this package.

type allSubtags struct{}

// Regions returns the list of supported regions. As all regions are in a
// consecutive range, it simply returns a slice of numbers in increasing order.
// The "undefined" region is not returned.
func (s allSubtags) Regions() []Region {
	reg := make([]Region, language.NumRegions)
	for i := range reg {

			}

			for _, arg := range args {
				// In vendor mode, the module graph is incomplete: it contains only the
				// explicit module dependencies and the modules that supply packages in
				// the import graph. Reject queries that imply more information than that.
				if arg == "all" {
					base.Fatalf(actionDisabledFormat, "compute 'all'")
				}
				if strings.Contains(arg, "...") {