- try
- List.find (has_description dsc) !nnum_choices
- with Not_found -> raise (Choice_not_found (lazy ("Num with dsc " ^ dsc)))
+ if dsc <> "natural number" then
+ raise (Choice_not_found (lazy ("Num with dsc " ^ dsc)))
+ else
+ "natural number", `Num_interp Nnumber_notation.ninterp_natural_number