return Data{}, fmt.Errorf("%s: too large for mmap", f.Name())
	}
	n := int(size)
	if n == 0 {
		return Data{f, nil}, nil
	}
	mmapLength := int(((size + pagesize - 1) / pagesize) * pagesize) // round up to page size
	data, err := syscall.Mmap(int(f.Fd()), 0, mmapLength, syscall.PROT_READ, syscall.MAP_SHARED)
	if err != nil {
		return Data{}, &fs.PathError{Op: "mmap", Path: f.Name(), Err: err}
	}
	return Data{f, data[:n]}, nil

			if pos != -1 {
				t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
			}
		}
	}
}

// test a small index across all page offsets
func TestIndexByteSmall(t *testing.T) {
	b := make([]byte, 5015) // bigger than a page
	// Make sure we find the correct byte even when straddling a page.
	for i := 0; i <= len(b)-15; i++ {
		for j := 0; j < 15; j++ {
			b[i+j] = byte(100 + j)
		}
		for j := 0; j < 15; j++ {

			// Report the error from the HTTP attempt.
			return nil, err
		}
	}

	// Note: accepting a non-200 OK here, so people can serve a
	// meta import in their http 404 page.
	if cfg.BuildX {
		fmt.Fprintf(os.Stderr, "# get %s: %v (%.3fs)\n", fetched.Redacted(), res.Status, time.Since(start).Seconds())
	}

	r := &Response{
		URL:        fetched.Redacted(),
		Status:     res.Status,

will result in the following requests:

	https://example.org/pkg/foo?go-get=1 (preferred)
	http://example.org/pkg/foo?go-get=1  (fallback, only with use of correctly set GOINSECURE)

If that page contains the meta tag

	<meta name="go-import" content="example.org git https://code.org/r/p/exproj">

the go tool will verify that https://example.org/?go-get=1 contains the

		}

		fmt.Fprintf(os.Stderr, "If reproducibility with go %s is not needed:\n\tgo mod tidy%s -compat=%s\n", compatVersion, goFlag, goVersion)

		// TODO(#46141): Populate the linked wiki page.
		fmt.Fprintf(os.Stderr, "For other options, see:\n\thttps://golang.org/doc/modules/pruning\n")
	}

	mg, err := rs.Graph(ctx)
	if err != nil {

//
// will result in the following requests:
//
//	https://example.org/pkg/foo?go-get=1 (preferred)
//	http://example.org/pkg/foo?go-get=1  (fallback, only with use of correctly set GOINSECURE)
//
// If that page contains the meta tag
//
//	<meta name="go-import" content="example.org git https://code.org/r/p/exproj">
//
// the go tool will verify that https://example.org/?go-get=1 contains the

		}
	})

	t.Cleanup(func() {
		// The subtests spawned by WalkDir run in parallel. When they complete, this
		// Cleanup callback will run. At that point we fetch the root URL (which
		// contains a status page), both to test that the root handler runs without
		// crashing and to display a nice summary of the server's view of the test
		// coverage.
		resp, err := http.Get(srv.URL)
		if err == nil {
			var body []byte

type CmdUsage struct {
	Summary string   // in the style of the Name section of a Unix 'man' page, omitting the name
	Args    string   // a brief synopsis of the command's arguments (only)
	Detail  []string // zero or more sentences in the style of the Description section of a Unix 'man' page

	// If Async is true, the Cmd is meaningful to run in the background, and its

int check_cbytes(char *b, size_t l) {
	int i;
	for (i = 0; i < l; i++) {
		if (b[i] != i) {
			return 0;
		}
	}
	return 1;
}

// issue 17065
// Test that C symbols larger than a page play nicely with the race detector.
int ii[65537];

// issue 17537
// The void* cast introduced by cgo to avoid problems
// with const/volatile qualifiers breaks C preprocessor macros that
// emulate functions.

    const len = collapsedEls.length;

    for (let i = 0; i < len; i++) {
        collapsedEls[i].classList.toggle('darkmode');
    }

    // Collect and spread the appropriate elements from all of the svgs on the page into one array
    const svgParts = [
        ...document.querySelectorAll('path'),
        ...document.querySelectorAll('ellipse'),
        ...document.querySelectorAll('polygon'),
    ];