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Theorem validrefs-put-badarrayfield

⊦ ¬ validrefs(str, refs, ty, st) ∧ ¬ junkref(str, refs .first, st) ∧ fs ' ≠ _type ∧ is_arraytype(st[r0 -- _type] .type) ∧ fs ' ≠ _length ∧ refs ≠ [] ∧ ¬ dups(refs .butlast) → ¬ validrefs(str, refs, ty, st[r0 -- fs ', val])

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