module Abstract1:sig..end
val is_disjunction : 'a Abstract1.t -> booltrue iff the argument value is a disjunction valueval of_disjunction : 'a Disjunction.t Abstract1.t -> 'b Abstract1.tval to_disjunction : 'a Abstract1.t -> 'b Disjunction.t Abstract1.tFailure if the argument value is not a disjunction value