private void processArgument(@NotNull DfType type, @NotNull PsiElement anchor) {
        DfaNullability nullability = DfaNullability.fromDfType(type);
        if (nullability == DfaNullability.NOT_NULL) {
          holder.registerProblem(anchor,
                                 JavaAnalysisBundle.message("dataflow.message.passing.non.null.argument.to.optional"),
                                 LocalQuickFix.notNullElements(DfaOptionalSupport.createReplaceOptionalOfNullableWithOfFix(anchor)));
        }
        else if (nullability == DfaNullability.NULL) {
          holder.registerProblem(anchor, JavaAnalysisBundle.message("dataflow.message.passing.null.argument.to.optional"),
                                 LocalQuickFix.notNullElements(DfaOptionalSupport.createReplaceOptionalOfNullableWithEmptyFix(anchor)));
        }
      }
private void processArgument(@NotNull DfType type, @NotNull PsiElement anchor)