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  1. or download this
    $self->{&{\&{$testname}}}->($system); #system is hashref
    
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    Use of uninitialized value $self in concatenation (.) or string
    Can't call method "_idown" on an undefined value
    Can't call method "_idown" on an undefined value
    
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    sub method {
        my $self = shift or die join(", ", caller()), "\n";
    ...
    }