@Nullable
  static PsiType getAddedElementType(PsiMethodCallExpression call) {
    JavaResolveResult resolveResult = call.resolveMethodGenerics();
    PsiMethod method = call.resolveMethod();
    if(method == null) return null;
    PsiParameter[] parameters = method.getParameterList().getParameters();
    if(parameters.length != 1) return null;
    return resolveResult.getSubstitutor().substitute(parameters[0].getType());
  }
@Nullable
  static PsiType getAddedElementType(PsiMethodCallExpression call)