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Proof step 7 from proof junkrefs-put-badclassfield (
previous step
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⊦ is_obj(str, r, st) ∧ fs ' ≠ _type ∧ ¬ fs ' ∈ instfields(st[r -- _type] .type .class) → is_obj(str, r, st[r -- fs ', val])
A spec-lemma