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Proof step 3 from proof validrefkeynotnull-addobj (
previous step
)
⊦ newref(r1, st) ∧ validrefvalnotnull(str, val, ty1, st) → validrefvalnotnull(str, val, ty1, addobj(r1, class, fis, st))
Lemma
validrefvalnotnull-addobj