testlog = bytes.TrimPrefix(testlog, testlogMagic)
	h := cache.NewHash("testInputs")
	// The runtime always looks at GODEBUG, without telling us in the testlog.
	fmt.Fprintf(h, "env GODEBUG %x\n", hashGetenv("GODEBUG"))
	pwd := a.Package.Dir
	for _, line := range bytes.Split(testlog, []byte("\n")) {
		if len(line) == 0 {
			continue
		}
		s := string(line)
		op, name, found := strings.Cut(s, " ")