Remember to follow the [pre bug report](https://github.com/caskroom/homebrew-cask/blob/master/doc/reporting_bugs/pre_bug_report.md) guide beforehand. Failure to do so might get your issue closed.
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I'm going through https://leanprover.github.io/tutorial. I'd expect the result of the "check" statements (which is manually added as comments) to show up somewhere upon execution. Unfortunately, it do…