public static String checkTypeArguments(PsiTypeElement qualifier, PsiType psiType) {
if (psiType instanceof PsiClassType) {
final PsiJavaCodeReferenceElement referenceElement =
qualifier.getInnermostComponentReferenceElement();
if (referenceElement != null) {
PsiType[] typeParameters = referenceElement.getTypeParameters();
for (PsiType typeParameter : typeParameters) {
if (typeParameter instanceof PsiWildcardType) {
return "Unexpected wildcard";
}
}
}
}
return null;
}
