Ast.literal_unit_iter
constraint 'b literal_unit_iter = 'b literal_unit_iter
method visit_Percent : 'b -> 'c -> unit
method visit_Year : 'b -> 'd -> unit
method visit_Month : 'b -> 'e -> unit
method visit_Day : 'b -> 'f -> unit
method visit_literal_unit : 'b -> 'g -> literal_unit -> unit