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$ cat pm_1185726_heredoc_pod.pl
my $str = <<=cut;
...

=cut
$

$ perl -MO=Deparse pm_1185726_heredoc_pod.pl
Use of bare << to mean <<"" is deprecated. Its use will be fatal in Pe
+rl 5.28 at pm_1185726_heredoc_pod.pl line 1.
...
pm_1185726_heredoc_pod.pl had compilation errors.
my $str = "" = 'cut';
$

$ perl -MO=Deparse pm_1185726_heredoc_pod.pl
my $str = "\n=head2 Some documentation\n\n";
pm_1185726_heredoc_pod.pl syntax OK

$ cat pm_1185726_heredoc_pod.pl
our $VERSION = '1.234';
...
=cut

print $str;

$ perldoc pm_1185726_heredoc_pod.pl

$ perl -wMstrict pm_1185726_heredoc_pod.pl

=head2 Some documentation

Doco for version: 1.234