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Proof step 145 from proof exvalidrefs-maxlength (
previous step
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⊦ is_array(r, st) → (has_reffield(r, st) ↔ st[r -- _length] .intval > 0 ∧ (is_reftype(st[r -- _type] .type .type) ∨ st[r -- _type] .type .type = void_type))
A spec-lemma