Alias to struct memembers of a function paramater as a shortcut => need this for XYZ of type void*

[Robert M. Münch via Digitalmars-d-learn]

struct X {
        TYPE a;
        TYPE b;
}

myFunc(X _struct){
        alias a = _struct.a;

        a = myOtherFunc();
}


X myStruct;

myFun(myStruct);


This gives an error: need this for a of type void*

I don't understand why, because all I want is a shortcut the symbol of 
the parameter.

--
Robert M. Münch
http://www.saphirion.com
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