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Proof step 46 from proof pathex-put-pathex-array-refval (
previous step
)
⊦ ¬ validrefs(str, refs0, st[refs0 .first -- _type] .type, st) ∧ refs0 ≠ [] → ¬ validrefs(str, refs + refs0, ty, st)
Lemma
validrefs-postfix