Specification linked-tree

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enrich node-heap , 
       tree with
   functions 
      tr : ref × tree → heap → bool;
   
   axioms 
      tr-base :  ⊦ tr(r, leaf) = (emp ∧ ⌜r = null⌝ );
      used for : s, ls;
       
      tr-rec :  ⊦ tr(r, branch(t0, a, t1)) = _∃ λ r0, r1. r => mknode(r0, a, r1) * tr(r0, t0) * tr(r1, t1);
end enrich