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sub <description function name> [(arg-proto)] {
     body....indented...between a sub and a closing }.

         my
           $    print_Need  = 
...
            Inf($_[0] ." needed by " . ($insted ? 
                "(installed) " : "") . $rpm_nvra . "\n") 
          };

    $print_Need("file foobar needs package xyzzy")

...
    $print_Need->("...");

#seems less clear