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Proof step 1 from proof validref-put-field (
previous step
)
⊦ validref(str, r, ty0, st) ∧ validref(str, r1, ty, st) ∧ ty ≤ fs .type ∧ is_reftype(fs .type) → validref(str, r, ty0, st[r0 -- fs ', refval(r1)])
Lemma
validref-put-refval