ok_to_remove?

# File lib/rubygems/dependency_list.rb, line 141
  def ok_to_remove?(full_name, check_dev=true)
    gem_to_remove = find_name full_name

    siblings = @specs.find_all { |s|
      s.name == gem_to_remove.name &&
        s.full_name != gem_to_remove.full_name
    }

    deps = []

    @specs.each do |spec|
      check = check_dev ? spec.dependencies : spec.runtime_dependencies

      check.each do |dep|
        deps << dep if gem_to_remove.satisfies_requirement?(dep)
      end
    end

    deps.all? { |dep|
      siblings.any? { |s|
        s.satisfies_requirement? dep
      }
    }
  end