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Proof step 3 from proof is_obj-put-badfield (
previous step
)
⊦ is_obj(r, st) ∧ fs ' ≠ _type ∧ ¬ fs ' ∈ instfields(st[r -- _type] .type .class) → is_obj(r, st[r -- fs ', val])
Lemma
isobj-put-badfield