> $ prove  --merge t/test.t                                                                                    
t/test.t .. Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/2 subtests

Test Summary Report
-------------------
t/test.t (Wstat: 256 (exited 1) Tests: 2 Failed: 1)
  Failed test:  2
  Non-zero exit status: 1
Files=1, Tests=2,  0 wallclock secs ( 0.01 usr  0.00 sys +  0.01 cusr  0.00 csys =  0.02 CPU)
Result: FAIL