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Proof step 13 from proof validref-refs-last-valid-subset (
previous step
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⊦ r ≠ jvmref ∧ ¬ validref(str, st0[r -- i '] .refval, ty, st0) ∧ 0 ≤ i ∧ i < st0[r -- _length] .intval → ¬ validref(str, r, mkarraytype(ty), st0)
A spec-lemma