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use strict;
use warnings;
...
   my $rc = invoker( $name, $name . '-arg' );
   print "$name: rc=$rc\n";
}

use strict;
use warnings;
...
   my $rc = Invoker::invoker( $name, $name . '-arg' );
   print "$name: rc=$rc\n";
}

use strict;
use warnings;
...
   my $rc = invoker( $name, $name . '-arg' );
   print "$name: rc=$rc\n";
}