start:
    // pass
    goto key

step1:
    // pass
    goto key@

step2:
    // pass
    goto @

step3:
    // pass
    goto step_name@flow_name

step4:
    // pass
    goto @$flow_var

step5:
    // pass
    goto $step_var

step6:
    // pass
    goto $step_var@$flow_var