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Proof step 92 from proof validref-refs-last-valid-subset (
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⊦ r ≠ jvmref ∧ ¬ validref(str, st0[r -- fs '] .refval, fs .type, st0) ∧ fs ' ∈ instfields(class) ∧ is_reftype(fs .type) → ¬ validref(str, r, mkclasstype(class), st0)
A spec-lemma