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Proof step 3 from proof pathex-addobj (previous step)

⊦ validFields(r, fis, addobj(r, class, fis, st)) ∧ fis .keys = instfields(class) ∧ newref(r, st) ∧ class+∃(str, class) ∧ ¬ is_abstract(class) ∧ validref(str, r, mkclasstype(class), addobj(r, class, fis, st)) ∧ fs ' × refval(refs .first) ∈ fis ∧ fs ' ∈ instfields(class) ∧ refs ≠ [] ∧ validrefs(str, refs, ty, st) → validrefs(str, r ' + refs, (addobj(r, class, fis, st)[r -- _type]) .type, addobj(r, class, fis, st))

Lemma validrefs-addobj-01