@Nullable
  public static PsiField getFieldOfGetter(PsiMethod method, Supplier<? extends PsiExpression> returnExprSupplier, boolean useIndex) {
    PsiField field = useIndex && method instanceof PsiMethodImpl && method.isPhysical()
                     ? JavaSimplePropertyGistKt.getFieldOfGetter(method)
                     : getSimplyReturnedField(returnExprSupplier.get());
    if (field == null || !checkFieldLocation(method, field)) return null;
    final PsiType returnType = method.getReturnType();
    return returnType != null && field.getType().equals(returnType) ? field : null;
  }
@Nullable
  public static PsiField getFieldOfGetter(PsiMethod method, Supplier<? extends PsiExpression> returnExprSupplier, boolean useIndex)