private static void fixCommaIfNeeded(@NotNull PsiElement element, boolean willBeLast) {
PsiElement comma = getComma(element);
if (willBeLast && comma != null) {
comma.delete();
} else if (!willBeLast && comma == null) {
PsiElement parent = element.getParent();
assert parent != null;
parent.addAfter(JetPsiFactory(parent.getProject()).createComma(), element);
}
}
