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Proof step 14 from proof unchanged-lookup-list-generic (previous step)

⊦ unchanged(str, r, st, st0) ∧ path∃(str, r, r0, st) ∧ r0 ≠ jvmref ∧ (is_classtype(st[r0 -- _type] .type) → sk ∈ instfields(st[r0 -- _type] .type .class)) ∧ (is_arraytype(st[r0 -- _type] .type) → sk = _length ∨ is_indexkey(sk) ∧ 0 ≤ sk .index ∧ sk .index < st[r0 -- _length] .intval) → st[r0 -- sk] = st0[r0 -- sk]

A spec-lemma