P3142R0: Printing Blank Lines with println

[H-G-Hristov]

Implements: https://wg21.link/P3142R0 (Fixes GH-4524)

Applied retroactively as DR:
https://github.com/orgs/microsoft/projects/1143?pane=issue&itemId=57457187

[H-G-Hristov]

@microsoft-github-policy-service agree

[StephanTLavavej]

/azp run STL-CI

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[StephanTLavavej]

Thanks! 😻 I pushed tiny changes to the product code, and then I figured out how to add test coverage without it hanging.

[StephanTLavavej]

I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

[H-G-Hristov]

@StephanTLavavej I was quite busy and I wasn't able to respond earlier.
I pushed some changes without checking your latest comments first. Sorry about that. Should I revert those?

Basically the idea is to test println() alone. In libc++ I did that for other another reason though.

Thank you!

[H-G-Hristov]

@StephanTLavavej I was quite busy and I wasn't able to respond earlier. I pushed some changes without checking your latest comments first. Sorry about that. Should I revert those?

Basically the idea is to test println() alone. In libc++ I did that for other another reason though.

Thank you!

I reverted those changes.

[StephanTLavavej]

No worries, and thanks for the revert! I've already mirrored this to the MSVC-internal repo (stacked up with 20 other commits), so further changes would have reset that process.

If you'd like to add additional test coverage, followup PRs are always welcome after this has merged to main.

Of course, if you discover late-breaking correctness issues, it's always possible to rework or hold back a PR that's already been mirrored, we just like to avoid disrupting the process for "nice to have" changes.

[StephanTLavavej]

Thanks again for implementing this feature, which is sure to be used by programmers from beginners to experts everywhere, and congratulations on your first microsoft/STL commit! 😻 🎉 🚀

This is expected to ship in VS 2022 17.11 Preview 2.

[H-G-Hristov]

Thanks again for implementing this feature, which is sure to be used by programmers from beginners to experts everywhere, and congratulations on your first microsoft/STL commit! 😻 🎉 🚀

This is expected to ship in VS 2022 17.11 Preview 2.

Thank you very much for your support!