as puppet is declarative and the catalogue is a graph, we can just include the realization of virtual resources anywhere in code. even at the stage where the virtual resource gets declared

gistfile1.pp

# this leads to the realization of both declared resources:

# soenke♥kellerautomat:~/projects/playground (master)$ puppet apply manifests/init.pp 
# virtual resource 2
# /Stage[main]/Some_module/Virtual_resource_declarer2[virtual resource 2]/Virtual_resource[virtual resource 2]/Notify[virtual resource 2]/message: defined 'message' as 'virtual resource 2'
# virtual resource 1
# /Stage[main]/Some_module/Virtual_resource_declarer1[virtual resource 1]/Virtual_resource[virtual resource 1]/Notify[virtual  resource 1]/message: defined 'message' as 'virtual resource 1'
# Finished catalog run in 0.61 seconds

node default {
  include some_module
}

class some_module {
  virtual_resource_declarer1 { 'virtual resource 1' : }
  virtual_resource_declarer2 { 'virtual resource 2' : }

}

define virtual_resource_declarer1() {
  include realizor

  @virtual_resource { $name : }
}

define virtual_resource_declarer2() {
  include realizor

  @virtual_resource { $name : }
}

class realizor {
  Virtual_Resource <| |>
}

define virtual_resource() {
  notify { $name : }
}