Thanks for all the replies, everyone, this holiday.

—John

Just keep in mind the important caveat that:

  do { BLOCK } while ( COND );
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is NOT equivalent to:

  while ( COND ) { BLOCK }
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In the first case, the code in BLOCK is executed once before checking the condition. This goes for until as well. However:

  do { BLOCK } for ( LIST );
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is equivalent to:

  for ( LIST ) { BLOCK }
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   MeowChow                                   
               s aamecha.s a..a\u$&owag.print

The condition at the end running once before the test is something I've long known, since the Pascal days. That for doesn't is not something I've thought about.

$value= "global";

do { print "Inside block: $value\n" }
   for (my $value= 5;  $value < 7;  ++$value);
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does not compile, so whether the loop variable is set first or later or what the scope is is moot. For the list form,

$_= 1;

do { print "Inside block: $_\n" }
   for (5..7);
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It is intuative that it work the same way, one iteration per item in the list, and you can't use a variable, e.g.

do { print "Inside block: $value\n" }
   for my $value (5..7);
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doesn't compile either. So variable scope issues are avoided.

Interesting.

—John