public TwoTypeConversionsPossibleT(type_conversion first, type_conversion second, location loc): base(loc)
 {
     _first = first;
     _second = second;
 }
 public PossibleTwoTypeConversionsInFunctionCall(ILocation loc, type_conversion first,
     type_conversion second)
 {
     _loc = loc;
     _first = first;
     _second = second;
 }
 public TwoTypeConversionsPossible(expression_node expression_node, type_conversion first,
     type_conversion second)
 {
     _en = expression_node;
     _first = first;
     _second = second;
 }