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Theorem okval-void

⊦ okval(val, void_type) ↔ is_referencevalue(val)

Type: An axiom
Validity: The proof is valid.
Features: simp, localsimp,
Comment: null has type void, and is compatible with references.
Used by: initial-okval, okval-case, okval-refval,
Used by units in proved state:
Proof exists?: No