Nextflow script showing how to repeat the execution of a process

feedback.nf

#!/bin/env nextflow

Channel 
  .from('abc')
  .map { tuple(0,it) }
  .set { foo }

Channel.create().set { feedback }

index = 0 
loop = feedback.take(3).map { tuple(index++,it) }

process bar {
  input: 
  set val(index), file(x) from foo .mix(loop) 
  output: 
  file q 
  
  script:
  if( index == 0 ) 
  """
  rev $x > q
  """
  
  else if( index >1 )
  """
  rev $x > q
  """
}

process baz {
  input: 
  file q from q 
  output: 
  file z into feedback
  file z into result
  
  """
  cat $q > z 
  echo 'hello' >> z 
  """ 
}

result.last().println { it.text }

This is a very useful example! Would this look similar in DSL2? I guess it could be used as a work around the fact that each process can only be called once?