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Specification ops
enrich
   separation
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   procedures alloc  : ref × heap nonfunctional nondeterministic;
              read ref × heap : obj  ;
              write ref × obj : heap nonfunctional ;
              free ref : heap nonfunctional ;
   
   
   

   

   axioms read-known : ((r => o0 * P))(H) ⊦ ⟪read(r, H; o1)⟫ (o0 = o1);
          read-unknown : ((r =>_ * P))(H) ⊦ ⟪read(r, H; o)⟫ true;
          write-known : ((r => o0 * P))(H) ⊦ ⟪write(r, o1; H)⟫ ((r => o1 * P))(H);
          write-unknown : ((r =>_ * P))(H) ⊦ ⟪write(r, o; H)⟫ ((r => o * P))(H);
          alloc : P(H) ⊦ ⟪alloc(; r, H)⟫ ((r =>_ * P))(H);
          free-unknown : ((r =>_ * P))(H) ⊦ ⟪free(r; H)⟫ P(H);
          free-known : ((r => o * P))(H) ⊦ ⟪free(r; H)⟫ P(H);

   

   
end enrich