class IRB::ExtendCommand::Ls

def dump_methods(o, klass, obj)
  singleton_class = begin obj.singleton_class; rescue TypeError; nil end
  dumped_mods = Array.new
  ancestors = klass.ancestors
  ancestors = ancestors.reject { |c| c >= Object } if klass < Object
  singleton_ancestors = (singleton_class&.ancestors || []).reject { |c| c >= Class }
  # singleton_class' ancestors should be at the front
  maps = class_method_map(singleton_ancestors, dumped_mods) + class_method_map(ancestors, dumped_mods)
  maps.each do |mod, methods|
    name = mod == singleton_class ? "#{klass}.methods" : "#{mod}#methods"
    o.dump(name, methods)
  end
end