G'day loris,
The reason you're getting that error is because the heredoc (in your module) is being interpolated.
In your module, you've probably either coded <<"PROLOG" or <<PROLOG.
See perlop: Quote-Like Operators for an explanation of how explicit single- and double-quoted terminating strings (i.e. PROLOG in your example) are interpolated;
also note that the absence of explicit quotes assumes double-quotes.
There are a variety of hoops you have to jump through to get similar code working in a one-liner.
These have mostly been pointed out in various replies.
You could embed newlines in your one-liner and do something like this:
$ perl -Mstrict -Mwarnings -e 'package test; my $text = <<\TEST;
test@heredoc
TEST
print $text'
test@heredoc
That's not using the module as such; just running the code in a package other than main.
You're also using a different (albeit equivalent) method of quoting the terminator (i.e. <<\TEST).
What you'd really want is something closer to this:
$ perl -Mstrict -Mwarnings -e 'package test; my $text = <<\TEST;
test@heredoc
TEST
sub test_print { print $text }
package main;
use parent -norequire => "test";
test::test_print()'
test@heredoc
That's a lot of effort; it's not really comparing apples with apples; and, given you could have copied most of the code you already had, probably takes a similar amount of time as coding this test script:
#!/usr/bin/env perl
use strict;
use warnings;
use pm_example_module;
pm_example_module::test_print();
and this test module:
package pm_example_module;
use strict;
use warnings;
my %text_blocks;
$text_blocks{en}{prolog} =<<'PROLOG';
You have received this email because something happened.
Please send feedback and suggestions to tldr@nohelp.org.
PROLOG
sub test_print {
print $text_blocks{en}{prolog};
}
1;
Running that script produces:
You have received this email because something happened.
Please send feedback and suggestions to tldr@nohelp.org.
Changing <<'PROLOG' to either <<"PROLOG" or <<PROLOG, produces (in both cases):
Possible unintended interpolation of @nohelp in string at pm_example_m
+odule.pm line 8.
Global symbol "@nohelp" requires explicit package name at pm_example_m
+odule.pm line 8.
Compilation failed in require at ./pm_example.pl line 6.
BEGIN failed--compilation aborted at ./pm_example.pl line 6.
You now have a valid test which reproduces what you were attempting to test and, I suspect, would have taken less time than writing and posting your OP.
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