+ | Opt_F_coqpass -- run the core-to-core coqPass, but don't change anything (just "parse/unparse")
+ | Opt_F_skolemize -- run the core-to-core coqPass, skolemizing the proof
+ | Opt_F_flatten -- run the core-to-core coqPass, flattening the proof
+ | Opt_D_dump_proofs -- dump natural deduction typing proof of the coqpass input