Feature request: also support function to return with action used in a return expression to omit temporary variables

To further make the 'omit explicit temporary variables' feature complete, please allow support for returning an action output as return expression.

Two preferred flavours:

Result MyFunc()
{
   return rp.DoSomething(); // return the valued reply of a call on a required port
}

Result Calc()
{
    return MyFunc(); // return the return value of an other function
}

At this moment, when trying to write it this way, you'll get the following response on dzn verify: error: action used in a return expression

As a consequence the developer has to write it still with temporary variables, which is not nice-ish:

Result MyFunc()
{
   Result temp = rp.DoSomething(); // temporarily store the valued reply of a call on a required port
   return temp;
}

Result Calc()
{
   Result temp = MyFunc(); // temporarily store the valued reply of an other function
   return temp;
}