sig val tailable : Flx_types.bexe_t list -> string list -> Flx_types.bexe_t list -> bool val chain_gotos : Flx_types.bexe_t list -> Flx_types.bexe_t list val final_tailcall_opt : Flx_types.bexe_t list -> Flx_types.bexe_t list end