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Proof step 27 from proof validrefs-addobj-01 (
previous step
)
⊦ st[r0 -- _type] = typeval(ty1) ∧ ty1 ≤ ty0 ∧ validrefs(str, r0 ' + refs0, ty, st) → validrefs(str, r0 ' + refs0, ty0, st)
Lemma
validrefs-type