perldoc -f do
"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 perlsyn for alternative strategies.

##</code><code>##

for (10..13) {
  print "Top loop $_\n";
  do_sub($_);
  print "-- after sub\n";
}

sub do_sub {
  my ($a) = shift;
  do {
    next if $a < 15;
    print "Sub $a\n";
  } while ($a < 20);
}

##</code><code>##

Top loop 10
Exiting subroutine via next at try2.pl line 14.
Top loop 11
Exiting subroutine via next at try2.pl line 14.
Top loop 12
Exiting subroutine via next at try2.pl line 14.
Top loop 13
Exiting subroutine via next at try2.pl line 14.