> perl
{
  print $x++;
  redo if $x<6;
}
__END__
012345 

##</code><code>##

> perl
X: 
{
  print $x++;
  goto X if $x<6;
}
__END__
012345 

##</code><code>##

       Basic BLOCKs
 
       A BLOCK by itself (labeled or not) is semantically equivalent to a loop
       that executes once.  Thus you can use any of the loop control
       statements in it to leave or restart the block.