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  1. or download this
    &mysub2(mysub1);
    sub mysub1{
    ...
            print "Exists";
        }
    }
    
  2. or download this
    my $rv = getsomething();
    die "Error while getting something" unless defined $rv;
    die "We did not find anything" unless $rv;
    print "Found " . scalar(@$rv) . " thing(s)\n";