private static boolean hasConflictingVariable(@Nullable PsiElement place, @NotNull String name, boolean allowShadowing) {
    if (place == null) {
      return false;
    }
    PsiResolveHelper helper = JavaPsiFacade.getInstance(place.getProject()).getResolveHelper();
    PsiVariable existingVariable = helper.resolveAccessibleReferencedVariable(name, place);
    if (existingVariable == null) return false;

    return !allowShadowing ||
           !(existingVariable instanceof PsiField) ||
           PsiTreeUtil.getNonStrictParentOfType(place, PsiMethod.class) == null;
  }
private static boolean hasConflictingVariable(@Nullable PsiElement place, @NotNull String name, boolean allowShadowing)