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Theorem junkref-put-refval

⊦ ¬ junkref(str, r, st) ∧ validref(str, r1, ty, st) ∧ ty ≤ fs .type ∧ is_reftype(fs .type) → ¬ junkref(str, r, st[r0 -- fs ', refval(r1)])

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