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Proof step 3 from proof cyclic-put-badclassfield (previous step)

⊦ ¬ validrefs(str, refs, ty, st) ∧ ¬ junkref(str, refs .first, st) ∧ fs ' ≠ _type ∧ is_classtype(st[r0 -- _type] .type) ∧ ¬ fs ' ∈ instfields(st[r0 -- _type] .type .class) ∧ refs ≠ [] ∧ ¬ dups(refs .butlast) → ¬ validrefs(str, refs, ty, st[r0 -- fs ', val])

Lemma validrefs-put-badclassfield