class Bundler::Resolver::Molinillo::VersionConflict

def message
  conflicts.values.flatten.reduce('') do |o, conflict|
    o << %(Bundler could not find compatible versions for gem "#{conflict.requirement.name}":\n)
    if conflict.locked_requirement
      o << %(  In snapshot (Gemfile.lock):\n)
      o << %(    #{clean_req conflict.locked_requirement}\n)
      o << %(\n)
    end
    o << %(  In Gemfile:\n)
    o << conflict.requirement_trees.map do |tree|
      t = ''
      depth = 2
      tree.each do |req|
        t << '  ' * depth << %(#{clean_req req})
        t << %( depends on) unless tree[-1] == req
        t << %(\n)
        depth += 1
      end
      t
    end.join("\n")
    if conflict.requirement.name == 'bundler'
      o << %(\n  Current Bundler version:\n    bundler (#{Bundler::VERSION}))
      other_bundler_required = !conflict.requirement.requirement.satisfied_by?(Gem::Version.new Bundler::VERSION)
    end
    if conflict.requirement.name == "bundler" && other_bundler_required
      o << "\n"
      o << "This Gemfile requires a different version of Bundler.\n"
      o << "Perhaps you need to update Bundler by running `gem install bundler`?\n"
    end
    if conflict.locked_requirement
      o << "\n"
      o << %(Running `bundle update` will rebuild your snapshot from scratch, using only\n)
      o << %(the gems in your Gemfile, which may resolve the conflict.\n)
    elsif !conflict.existing
      if conflict.requirement_trees.first.size > 1
        o << "Could not find gem '#{clean_req(conflict.requirement)}', which is required by "
        o << "gem '#{clean_req(conflict.requirement_trees.first[-2])}', in any of the sources."
      else
        o << "Could not find gem '#{clean_req(conflict.requirement)} in any of the sources\n"
      end
    end
    o
  end
end