class Bundler::PubGrub::VersionRange::Empty

def ==(other)
  other.class == self.class
end

def allows_all?(other)
  other.empty?
end

def any?
  false
end

def empty?
  true
end

def eql?
  other.empty?
end

def hash
  [].hash
end

def include?(_)
  false
end

def initialize
end

def intersect(other)
  self
end

def intersects?(_)
  false
end

def invert
  VersionRange.any
end

def select_versions(_)
  []
end

def to_s
  "(no versions)"
end