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use strict;
use warnings;
...
        $x+=1;
    }
}

         Rate   eval noeval
eval   1495/s     --   -62%
noeval 3953/s   164%     --

use strict;
use warnings;
use Benchmark 'cmpthese';
...
        }
    }
}

           Rate   eval noeval
eval    67797/s     --   -39%
noeval 111111/s    64%     --