public static IntroduceHolderFix createFix(PsiField field, PsiIfStatement ifStatement) {
    if (!isStaticAndAssignedOnce(field) || !isSafeToDeleteIfStatement(ifStatement, field)) {
      return null;
    }
    return new IntroduceHolderFix();
  }
public static IntroduceHolderFix createFix(PsiField field, PsiIfStatement ifStatement)