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Proof step 9 from proof cyclic-addobj (
previous step
)
⊦ validrefs(str, refs, ty0, addobj(r, class, fis, st)) ∧ newref(r, st) ∧ r ∈ refs ∧ r0 = refs .first → junkref(str, r0, st)
Lemma
validrefs-addobj-junkref