Puppet future

future.pp

class a { 
  $var = ''
}

class c { 
  include a
  notice ($a::var)
}

class b { 
  include a
  $a::var += 'future is now'
  notice($a::var)
}

include b
include c

gistfile1.txt

$ puppet apply future.pp
notice: Scope(Class[B]): future is now
notice: Scope(Class[C]): future is now
notice: Finished catalog run in 0.07 seconds