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Proof step 39 from proof unchanged-fits (previous step)

⊦ unchanged(str, r, st, st0) ∧ ¬ junkref(str, r, st) ∧ r ≠ jvmref ∧ is_referencevalue(st[r -- sk]) ∧ (is_classtype(st[r -- _type] .type) → sk ∈ instfields(st[r -- _type] .type .class)) ∧ (is_arraytype(st[r -- _type] .type) → is_indexkey(sk) ∧ 0 ≤ sk .index ∧ sk .index < st[r -- _length] .intval) → unchanged(str, st[r -- sk] .refval, st, st0)

A spec-lemma