Something
public text v1 · immutable[test]
exten => s,1,set(COUNT=1)
exten => s,n,while($[${COUNT}=1])
exten => s,n,while(1)
exten => s,n,goto(exit)
exten => s,n,endwhile
exten => s,n(exit),set(COUNT=2)
exten => s,n,endwhile[test]
exten => s,1,set(COUNT=1)
exten => s,n,while($[${COUNT}=1])
exten => s,n,while(1)
exten => s,n,goto(exit)
exten => s,n,endwhile
exten => s,n(exit),set(COUNT=2)
exten => s,n,endwhile