}
	loadJS := func(fname string) string {
		return `<script>` + "\n" + loadFile(fname) + `</script>` + "\n"
	}

	// Define a named template with specified contents.
	def := func(name, contents string) {
		sub := template.New(name)
		template.Must(sub.Parse(contents))
		template.Must(templates.AddParseTree(name, sub.Tree))
	}

	// Embedded files.
	def("css", loadCSS("html/common.css"))

	overwrite bool                                   // if true, overwrite go.sum without incorporating its contents
	enabled   bool                                   // whether to use go.sum at all
}

type modSumStatus struct {
	used, dirty bool
}

// Reset resets globals in the modfetch package, so previous loads don't affect
// contents of go.sum files.
func Reset() {
	GoSumFile = ""
	WorkspaceGoSumFiles = nil

			if doc.Links[key] != nil {
				return nil, fmt.Errorf("duplicate link reference %q; second in %s", key, filename)
			}
			doc.Links[key] = link
		}
	}
	// Remove headings with empty contents.
	doc.Blocks = removeEmptySections(doc.Blocks)
	if len(doc.Blocks) > 0 && len(doc.Links) > 0 {
		// Add a blank line to separate the links.
		lastPos := lastBlock(doc).Pos()
		lastPos.StartLine += 2

		http.Error(w, err.Error(), http.StatusBadRequest)
		ui.options.UI.PrintErr(err)
		return nil, nil
	}
	return rpt, catcher.errors
}

// renderHTML generates html using the named template based on the contents of data.
func renderHTML(dst io.Writer, tmpl string, rpt *report.Report, errList, legend []string, data webArgs) error {
	file := getFromLegend(legend, "File: ", "unknown")
	profile := getFromLegend(legend, "Type: ", "unknown")

			rs = overrideRoots(ctx, rs, []module.Version{{Path: "go", Version: v}})

			// We need to add a 'go' version to the go.mod file, but we must assume
			// that its existing contents match something between Go 1.11 and 1.16.
			// Go 1.11 through 1.16 do not support graph pruning, but the latest Go
			// version uses a pruned module graph — so we need to convert the
			// requirements to support pruning.

	// The map keys are the elements of Analysis.Required,
	// and the type of each corresponding value is the required
	// analysis's ResultType.
	ResultOf map[*Analyzer]interface{}

	// ReadFile returns the contents of the named file.
	//
	// The only valid file names are the elements of OtherFiles
	// and IgnoredFiles, and names returned by
	// Fset.File(f.FileStart).Name() for each f in Files.
	//

		The version of the installed Go tree, as reported by runtime.Version.
	`,
}

var HelpFileType = &base.Command{
	UsageLine: "filetype",
	Short:     "file types",
	Long: `
The go command examines the contents of a restricted set of files
in each directory. It identifies which files to examine based on
the extension of the file name. These extensions are:

	.go
		Go source files.
	.c, .h
		C source files.

)

// NOTE(rsc): Everything here could use cas if contention became an issue.
var (
	// profInsertLock protects changes to the start of all *bucket linked lists
	profInsertLock mutex
	// profBlockLock protects the contents of every blockRecord struct
	profBlockLock mutex
	// profMemActiveLock protects the active field of every memRecord struct
	profMemActiveLock mutex
	// profMemFutureLock is a set of locks that protect the respective elements

}

// makeEvent creates an Event from the provided information.
//
// It's just a convenience function; it's always OK to construct
// an Event manually if this isn't quite the right way to express
// the contents of the event.
func makeEvent(table *evTable, ctx schedCtx, typ event.Type, time Time, args ...uint64) Event {
	ev := Event{
		table: table,
		ctx:   ctx,
		base: baseEvent{
			typ:  typ,
			time: time,

//		The file is a JSON struct with a single field, named 'Replace', that
//		maps each disk file path (a string) to its backing file path, so that
//		a build will run as if the disk file path exists with the contents
//		given by the backing file paths, or as if the disk file path does not
//		exist if its backing file path is empty. Support for the -overlay flag
//		has some limitations: importantly, cgo files included from outside the