Convert procs to lambdas

to_lambda.rb

module ToLambda
  def to_lambda(block)
    if Puppet::Util::Package.versioncmp(RUBY_VERSION,"1.9") >=0
      unless block.lambda?
        # This code is based on: https://github.com/schneems/proc_to_lambda
        # See also https://github.com/schneems/proc_to_lambda/issues/1
        if RUBY_ENGINE && RUBY_ENGINE == "jruby"
          lambda(&block)
        else
          Object.new.define_singleton_method(:_, &block).to_proc
        end
      end
    else
      block
    end
  end
end