boxes.jl this is mistake (GtkTreeRowReference)?

[yadmtr]

hi, can anyone explain why in the (boxes.jl) ccall((:gtk_tree_row_reference_copy ... Nothing instead of Ptr{Gtk.GtkTreeRowReference}? in gtk+ doc: GtkTreeRowReference * gtk_tree_row_reference_copy (GtkTreeRowReference *reference); and why return path?

mutable struct GtkTreeRowReference <: GBoxed
    handle::Ptr{GtkTreeRowReference}
    function GtkTreeRowReference(ref::Ptr{GtkTreeRowReference}, own::Bool = false)
        x = new( own ? ref :
            ccall((:gtk_tree_row_reference_copy, Gtk.libgtk), Nothing, (Ptr{GtkTreeRowReference},), ref))
        finalizer(x, x::GtkTreeRowReference->begin
                    ccall((:gtk_tree_row_reference_free, Gtk.libgtk), Nothing, (Ptr{GtkTreeRowReference},), x.handle)
                end)
        path
    end
end

maybe this is more correct

mutable struct GtkTreeRowReference <: GBoxed
    handle::Ptr{GtkTreeRowReference}
    function GtkTreeRowReference(ref::Ptr{GtkTreeRowReference}, own::Bool = false)
        x = new( own ? ref :
            ccall((:gtk_tree_row_reference_copy, Gtk.libgtk), Ptr{GtkTreeRowReference}, (Ptr{GtkTreeRowReference},), ref))
        f = x::GtkTreeRowReference->ccall((:gtk_tree_row_reference_free, Gtk.libgtk), Nothing, (Ptr{GtkTreeRowReference},), x.handle)
        finalizer(f,x)
        x
    end
end