module Debutil:sig..end
group_by_source universe returns a hashtbl that maps
(source,sourceversion) -> to a packages listinclude struct ... end
val get_source : Packages.package -> Format822.name * Format822.versionval cluster : Packages.package list ->
(Format822.name * Format822.version,
(string * string * Packages.package list) list)
ExtLib.Hashtbl.tgroup_by_source universe returns a hashtbl that maps
(source,sourceversion) -> to a packages list