do BLOCK and naked BLOCK's are completely unrelated. The documentation for do BLOCK is illuminating: 
Not really a function. Returns the value of the last command in the se
+quence of commands 
indicated by BLOCK. When modified by a loop modifier, executes the BLO
+CK once before testing 
the loop condition. (On other statements the loop modifiers test the c
+onditional first.) 

do BLOCK does not count as a loop, so the loop control statements next
+, last, or redo cannot 
be used to leave or restart the block. See the perlsyn manpage for alt
+ernative strategies.

[download]
Naked BLOCK's on the other hand do not return values, cannot be used with loop modifiers, but can use loop control statements. Both naked BLOCK's and do BLOCK establish a new lexical scope within the BLOCK, however. 

   MeowChow                                   
               s aamecha.s a..a\u$&owag.print

In reply to Re: {} vs do{} by MeowChow
in thread {} vs do{} by John M. Dlugosz

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