@Nullable
  public static AddThisQualifierFix buildFix(PsiExpression expressionToQualify, PsiMember memberAccessed) {
    if (!isThisQualifierPossible(expressionToQualify, memberAccessed)) {
      return null;
    }
    return new AddThisQualifierFix();
  }
@Nullable
  public static AddThisQualifierFix buildFix(PsiExpression expressionToQualify, PsiMember memberAccessed)