module Bundler::VersionRanges

def self.empty?(ranges, neqs)
  !ranges.reduce(ReqR::UNIVERSAL) do |last_range, curr_range|
    next false unless last_range
    next false if curr_range.single? && neqs.include?(curr_range.left.version)
    next curr_range if last_range.right.version == ReqR::INFINITY
    case last_range.right.version <=> curr_range.left.version
    # higher
    when 1 then next ReqR.new(curr_range.left, last_range.right)
    # equal
    when 0
      if last_range.right.inclusive && curr_range.left.inclusive && !neqs.include?(curr_range.left.version)
        ReqR.new(curr_range.left, [curr_range.right, last_range.right].max)
      end
    # lower
    when -1 then next false
    end
  end
end