[Issue 4042] Unable to instantiate a struct template.

[wrzosk]

The test case compiles when exec method definition is moved down:
template isQObjectType(T)
{
     enum isQObjectType = is(T.__isQObjectType);
}

template QTypeInfo(T)
{
     static if (!isQObjectType!T)
     {
         enum size = T.sizeof;
     }
}

struct QList(T)
{
     alias QTypeInfo!T TI;
     int x;

     void foo()
     {
         x++;
     }
}


interface IQGraphicsItem
{
}
void exec(QList!(QAction) actions) {}

abstract class QGraphicsObject : IQGraphicsItem
{
}

class QGraphicsWidget : QGraphicsObject
{
}

class QAction
{
     final void associatedGraphicsWidgets(QList!(QGraphicsWidget) a)
     {
         QList!(QGraphicsWidget) x;
     }
}

void main()
{
}