Determine the last line of the template's insertion

[mardiyah]

How to ascertain the last line of the template's inserted argument ? on
    
    
    foo( insert : untyped) =
      if i < 5:
        echo "hello"
       elif i < 7:
         echo "world"
         insert
    
    var i
    while i < 9 :
       inc(i)
       foo() :
         echo "foo"
         echo "bar"
       else:
          break
    
    
    Run

must definitively confirm the inserted lines are only
    
    
    
    echo "foo"
    echo "bar"
    
    Run

thanks before