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Proof step 3 from proof okclass-int (previous step)

⊦ okclass(val, class1, st) ↔ reftypep(val, st) ∧ (val .refval ≠ jvmref → val .refval -- _type ∈ st ∧ st[val .refval -- _type] = typeval(mkclasstype(class1)))

Proof step 3 from proof okclass-int (previous step)

Lemma okclass