= '.';"?

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Why doesn't ||= work with arrays? 2 answers

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It's impossible for the code @ARGV to both return the array itself and the number of elements in it, so @ARGV ||= '.'; makes no sense. You need to evaluate @ARGV twice, once in scalar context (to get the number of elements), and once as an lvalue (to get the array itself).

 @ARGV = @ARGV || '.';

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