code: func UntrustedPlatforms(root *x509.Certificate) []string {
  	ret := []string{}
  	for _, platform := range Platforms {
  		if !platform.Trust(root) {
  			ret = append(ret, platform.Name)
  		}
  	}
  	return ret
  }
docs: // UntrustedPlatforms returns a list of platforms which don't trust the root certificate.