cakeml
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remove opt_rel_def in flat_to_closProofTheory
https://github.com/CakeML/cakeml/blob/6ddaf6f8d86d8d5f57f0bcfc8fdd78f855e3daae/compiler/backend/proofs/flat_to_closProofScript.sml#L72-L76
OPTREL should be used instead.