testing: in example, empty output not distinguished from missing output #4485
If it's not valid (I disagree) then it should be rejected outright. It should never just be silently ignored. I was putting // Output: lines at the end of my example code as a reminder to go back and fill in the output. Since I knew the code did generate output, I assumed this would make the example test fail, and in the process of failing tell me what the output was. But instead the tests passed, so I had to go back and change them all to // Output: XXX Russ
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