Perl is very particular about the arguments to sort. In this case perl is interpreting your code to mean that it should use Con::liveones to sort the empty list ().

You should just store the list in a temporary array, otherwise you'll have to do something hideous like this: 

my @livesys = sort @{[Con::liveones()]};

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In reply to Re: Dropping the ampersand by imp
in thread Dropping the ampersand by throop

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