Fpath.SetPath sets.
type elt = pathpp ~sep pp_elt ppf ss formats the elements of ss on ppf. Each element is formatted with pp_elt and elements are separated by ~sep (defaults to Format.pp_print_cut). If the set is empty leaves ppf untouched.
pp_set ppf ss prints an unspecified set-like representation of ss on ppf using Fpath.pp.
pp_dump ppf ss prints an unspecified representation of ss on ppf with Fpath.pp_dump.