rpt, errList := ui.makeReport(w, req, []string{"svg"}, nil)
	if rpt == nil {
		return // error already reported
	}

	// Generate dot graph.
	g, config := report.GetDOT(rpt)
	legend := config.Labels
	config.Labels = nil
	dot := &bytes.Buffer{}
	graph.ComposeDot(dot, g, &graph.DotAttributes{}, config)

	// Convert to svg.
	svg, err := dotToSvg(dot.Bytes())
	if err != nil {

		// test EvalSymlinks(".")
		testEvalSymlinksAfterChdir(t, path, ".", ".")

		// test EvalSymlinks("C:.") on Windows
		if runtime.GOOS == "windows" {
			volDot := filepath.VolumeName(tmpDir) + "."
			testEvalSymlinksAfterChdir(t, path, volDot, volDot)
		}

		// test EvalSymlinks(".."+path)
		dotdotPath := simpleJoin("..", test.dest)
		if filepath.IsAbs(test.dest) || os.IsPathSeparator(test.dest[0]) {

	HotInitial                       // In the block order, the first one for a given loop.  Not necessarily topological header.
	HotPgo                           // By PGO-based heuristics, this block occurs in a hot loop

	HotNot                 = 0
	HotInitialNotFlowIn    = HotInitial | HotNotFlowIn          // typically first block of a rotated loop, loop is entered with a branch (not to this block).  No PGO

	OSLICE3ARR:        8,
	OSLICEHEADER:      8,
	OSTRINGHEADER:     8,
	ODOTINTER:         8,
	ODOTMETH:          8,
	ODOTPTR:           8,
	ODOTTYPE2:         8,
	ODOTTYPE:          8,
	ODOT:              8,
	OXDOT:             8,
	OMETHVALUE:        8,
	OMETHEXPR:         8,
	OPLUS:             7,
	ONOT:              7,
	OBITNOT:           7,
	ONEG:              7,
	OADDR:             7,

	ENOLINK            = Errno(1144)
	EADV               = Errno(1145)
	ESRMNT             = Errno(1146)
	ECOMM              = Errno(1147)
	EPROTO             = Errno(1148)
	EMULTIHOP          = Errno(1149)
	EDOTDOT            = Errno(1150)
	EREMCHG            = Errno(1151)
	ECANCELED          = Errno(1152)
	EINTRNODATA        = Errno(1159)
	ENOREUSE           = Errno(1160)
	ENOMOVE            = Errno(1161)
)

	ECONNREFUSED    = Errno(0x6f)
	ECONNRESET      = Errno(0x68)
	EDEADLK         = Errno(0x23)
	EDEADLOCK       = Errno(0x23)
	EDESTADDRREQ    = Errno(0x59)
	EDOM            = Errno(0x21)
	EDOTDOT         = Errno(0x49)
	EDQUOT          = Errno(0x7a)
	EEXIST          = Errno(0x11)
	EFAULT          = Errno(0xe)
	EFBIG           = Errno(0x1b)
	EHOSTDOWN       = Errno(0x70)
	EHOSTUNREACH    = Errno(0x71)

	ECONNREFUSED    = Errno(0x6f)
	ECONNRESET      = Errno(0x68)
	EDEADLK         = Errno(0x23)
	EDEADLOCK       = Errno(0x23)
	EDESTADDRREQ    = Errno(0x59)
	EDOM            = Errno(0x21)
	EDOTDOT         = Errno(0x49)
	EDQUOT          = Errno(0x7a)
	EEXIST          = Errno(0x11)
	EFAULT          = Errno(0xe)
	EFBIG           = Errno(0x1b)
	EHOSTDOWN       = Errno(0x70)
	EHOSTUNREACH    = Errno(0x71)

	ECONNREFUSED    = Errno(0x6f)
	ECONNRESET      = Errno(0x68)
	EDEADLK         = Errno(0x23)
	EDEADLOCK       = Errno(0x23)
	EDESTADDRREQ    = Errno(0x59)
	EDOM            = Errno(0x21)
	EDOTDOT         = Errno(0x49)
	EDQUOT          = Errno(0x7a)
	EEXIST          = Errno(0x11)
	EFAULT          = Errno(0xe)
	EFBIG           = Errno(0x1b)
	EHOSTDOWN       = Errno(0x70)
	EHOSTUNREACH    = Errno(0x71)

	ECONNREFUSED    = Errno(0x6f)
	ECONNRESET      = Errno(0x68)
	EDEADLK         = Errno(0x23)
	EDEADLOCK       = Errno(0x23)
	EDESTADDRREQ    = Errno(0x59)
	EDOM            = Errno(0x21)
	EDOTDOT         = Errno(0x49)
	EDQUOT          = Errno(0x7a)
	EEXIST          = Errno(0x11)
	EFAULT          = Errno(0xe)
	EFBIG           = Errno(0x1b)
	EHOSTDOWN       = Errno(0x70)
	EHOSTUNREACH    = Errno(0x71)

	ECONNREFUSED    = Errno(0x6f)
	ECONNRESET      = Errno(0x68)
	EDEADLK         = Errno(0x23)
	EDEADLOCK       = Errno(0x3a)
	EDESTADDRREQ    = Errno(0x59)
	EDOM            = Errno(0x21)
	EDOTDOT         = Errno(0x49)
	EDQUOT          = Errno(0x7a)
	EEXIST          = Errno(0x11)
	EFAULT          = Errno(0xe)
	EFBIG           = Errno(0x1b)
	EHOSTDOWN       = Errno(0x70)
	EHOSTUNREACH    = Errno(0x71)