code: func EqualTokens(a, b *Token) bool {
  	if a == b {
  		return true
  	}
  	if a == nil {
  		a = &Token{}
  	}
  	if b == nil {
  		b = &Token{}
  	}
  	return a.AccessToken == b.AccessToken && a.Expiry.Equal(b.Expiry) && a.Email == b.Email
  }
docs: // EqualTokens returns true if tokens are equal.
  //
  // 'nil' token corresponds to an empty access token.