Benchmark: timing 100 iterations of block, line...
     block: 32 wallclock secs (32.52 usr +  0.36 sys = 32.88 CPU) @  3.04/s (n=100)
      line: 19 wallclock secs (17.92 usr +  0.16 sys = 18.08 CPU) @  5.53/s (n=100)