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Proof step 1 from proof validref-put-field-any (
previous step
)
⊦ is_referencevalue(val) ∧ validref(str, val .refval, fs .type, st) ∧ validref(str, r, ty, st) ∧ is_reftype(fs .type) → validref(str, r, ty, st[r0 -- fs ', val])
Lemma
validref-put-field-refval