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Proof step 2 from proof is_valid_ref-put-equiv (
previous step
)
⊦ okval(st[r1 -- sk], sk .fs .type) ∧ r1 -- sk ∈ st ∧ is_fskey(sk) ∧ okval(val, sk .fs .type) ∧ sk .fs .type ≠ void_type → (is_obj(str, r, st[r1 -- sk, val]) ↔ is_obj(str, r, st))
Lemma
is_obj-put-equiv