Use GC_ref on a pointer

[lqdev]

I have a type stored in C, that's a pointer to a type.
    
    
    type
      MyType = object
    
    var point = cast[ptr MyType](someCAllocFunction(sizeof(ptr MyType)))
    GC_ref(point) # this doesn't work, because GC_ref expects a ``ref T``, 
``seq[T]``, or ``string``
    
    
    Run

How can I achieve this?