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Proof step 22 from proof junkref-put-badfield (previous step)

⊦ ¬ junkrefs(str, refs, ty, st) ∧ ¬ (is_typevalue(st[r0 -- _type]) ∧ is_reftype(st[r0 -- _type] .type)) → ¬ junkrefs(str, refs, ty, st[r0 -- fs ', val])

Lemma junkrefs-put-badfield