LB5.353 exit for / exit while difference

[tsh73]

I *thought* I know like exit for / exit while works in LB4.
I was wrong.
Both codes below (exit for from inside of nested while, exit while from inside of nested for) does not compile in LB4! (saying "EXIT FOR without FOR" / "EXIT WHILE without WHILE")
But they work just like I imagine - in LB 5.353.
(good thing, IMHO)

exit for from inside of nested while
for i = 1 to 2
   print i
   while x<3
       x=x+1
       print "",x
       if (x=2) and (i=1) then  
           print "!!"
           exit for    'this one does not compile in LB4
       end if
   wend
next

exit while from inside of nested for
while x<3
   x=x+1
   print x
   for i = 1 to 2
       print "", i
       if (x=2) and (i=1) then  
           print "!!"
           exit while 'this one does not compile in LB4
       end if
   next
wend