xo-ordinaltree: rbtree ops satisfy gc write barriers
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@ -121,7 +121,7 @@ namespace xo {
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virtual TaggedPtr self_tp() const;
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/** print on stream @p os **/
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virtual void display(std::ostream & os) const = 0;
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virtual void display(std::ostream & os) const;
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// Inherited from IObject..
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