[release candidate] pantsbuild.pants 1.3.0rc0

[Stu Hood]

Finally, it is time!

The first release candidate for the long-awaited 1.3.0 stable release is now available on pypi.

Please help to test this release in your repos to help ensure an excellent and stable final 1.3.0!

Thank you to everyone who has contributed since 1.2.0!

Adam Chainz

Benjy Weinberger

Brandon Milton

Chris Heisterkamp

Dave Brewster

Derek Young

Drew Rothstein

Eric Ayers

Eugene Burmako

Fiona Condone

Ity Kaul

James Bench

Jason Song

Jeremy Hintz

John Sirois

Jonathan D. Simms

Kevin Oliver

Kris Wilson

Kyle Derr

Larry Hosken

Mark Davis

Mateo Rodriguez

Matt Landis

Nadav Samet

Nick Howard

Ny Saechao

Peiyu Wang

Roger Jiang

Sergey Serebryakov

Stefan Sauer

Stu Hood

Travis Crawford

Troy Howard

Xaelias

Yi Cheng

Yujie Chen

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@stuhood

[Benjy Weinberger]

W00t!! Congrats all, and thanks to all the many contributors!

[Stu Hood]

To help motivate testing, here is a list of particularly significant changes in this release:

• Pants' python backend has been overhauled and modernized to support caching, and to lower the latency of re-running tests after a code edit.
• Pants now uses a native code 'engine' implemented in rust, which unlocks significant performance improvements in the future.
• A daemon that caches BUILD file parsing and file fingerprinting (and more to follow!) is now ready for alpha testing (with one significant caveat).
• A default set of implicit_sources can now be manually enabled to further reduce BUILD file boilerplate. It should become the default in the next stable release.
• The Zinc incremental scala compiler is now at 1.0.0, with improved incremental behaviour.
• Style-related tasks that used to be in the `compile` goal have moved to a new `lint` goal.
• The `fmt` goal was added, with support for scalafmt, `gofmt`, and python `isort` to start.
• Support for yarnpkg in the node contrib module.
• Support for relative `jar` declarations, to allow for committing jars in your repo (if that's your bag!)
• A contrib module for errorprone was added.
• Direct support for `scalatest` tests in the pants JVM test runner.

See www.pantsbuild.org/notes-1.3.x.html for the complete list of changes since 1.2.0.

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@stuhood

[Stu Hood]

In Twitter's internal testing of this release candidate, we discovered that #4572 was hitting file length limits in our CI.

So there will need to be another release candidate. But please continue to test 1.3.0rc0 so that we can gather any other fixes you might want included in the stable release!

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@stuhood

[Stu Hood]

The next rc is being prepped!

https://github.com/pantsbuild/pants/pull/4588

If it's missing a fix that you were expecting, please let me know; otherwise it will likely go out tomorrow morning.

Thanks for the issue reports!

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@stuhood