module LExceptionless:sig..end
val find : f:('a -> bool) -> 'a list -> 'a optionval rfind : f:('a -> bool) -> 'a list -> 'a optionval findi : f:(int -> 'a -> bool) -> 'a list -> (int * 'a) optionval split_at : int -> 'a list -> [ `Invalid_argument of string | `Ok of 'a list * 'a list ]val at : 'a list -> int -> [ `Invalid_argument of string | `Ok of 'a ]val assoc : 'a -> ('a * 'b) list -> 'b optionval assoc_inv : 'a -> ('b * 'a) list -> 'b optionval assq : 'a -> ('a * 'b) list -> 'b option