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Proof step 23 from proof put-switch-primval-index-field (previous step)

⊦ fits(r, sks, st) ∧ ¬ is_reftype(ty) ∧ ¬ junkref(str, r, st) → (mkfs(class, ty, fieldvar) ' ∈ sks ↔ ¬ ¬ (mkfs(class, ty, fieldvar) ' = sks .last ∧ sks ≠ []))

Lemma fits-no-reftype