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Proof step 2 from proof junkref-put-other-fieldclass (
previous step
)
⊦ ¬ junkref(str, r, st) ∧ fs ' ≠ _type ∧ is_classtype(st[r0 -- _type] .type) ∧ ¬ fs ' ∈ instfields(st[r0 -- _type] .type .class) → ¬ junkref(str, r, st[r0 -- fs ', val])
A spec-lemma