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All the Perl that's Practical to Extract and Report

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  • …with strict and warnings enabled?
    Ordinary morality is for ordinary people. -- Aleister Crowley
  • You have two different $foo variables in there. Is that the actual code you're trying to use?

    If the package version of $foo has a value, that's what the lexical version of $foo gets in the assignment:

    $foo = 'Hello'; # package version
    print(  my $foo = bar() ? $foo : "unknown" );
    print "foo is [$foo]";
    sub bar { 1 };