Bump cats-effect_2.12 from 0.4 to 3.0.1

[dependabot-preview]

Bumps cats-effect_2.12 from 0.4 to 3.0.1.

Release notes

Sourced from cats-effect_2.12's releases.

v3.0.1

This release is fully backwards and forwards compatible with everything in the 3.0.x lineage.

• Added support for Scala 3.0.0-RC2
• Removed support for Scala 3.0.0-M3

User Facing Pull Requests

• #1845 – Document how to build the site (@gvolpe)
• #1837 – Clean up some dead code (@vasilmkd)
• #1842, #1837 – Documentation improvements (@kubukoz, @LLCampos)

Special thanks to all of you!

v3.0.0

Cats Effect 3.0.0 is the first release in the 3.x lineage and the first ever major breaking change since 1.0. It represents a substantial leap forward for the library and for the ecosystem in numerous major areas, including safety, ergonomics, composability, and performance.

Even more excitingly, Cats Effect 3 represents a sturdy foundation on which we can continue to push the boundaries of what is possible within the Scala FP ecosystem! Every aspect of the library was carefully designed to foster simpler and safer usage patterns within downstream libraries. This design goal has touched almost every aspect of the API and nearly every semantic decision.

Acknowledgements

When Cats Effect 1.0.0 was released, it wasn't even clear that such a fundamentally foundational framework could exist in a space as complex as asynchronous effect systems. Over the years, we have learned that not only can such a framework exist, it is capable of fostering a thriving and innovative ecosystem for building high-performance, scalable, compositional software in an asynchronous and purely functional style. The success of Cats Effect in this space is owed in no small part to the tireless efforts of Alexandru Nedelcu, the maintainer of this project during that era. While Alex has since moved on to other endeavors, the lingering effects of his vision remain imprinted upon this library and the ecosystem as a whole.

The roots of the 3.0.0 project go back almost two and a half years. Countless people have influenced thinking and opinions on various aspects of the system. Many spirited debates and discussions were refined down to their essence and wrapped up into the whole. And of course, countless contributors have invested an enormous volume of their time into making this possible.

It is literally impossible to thank everyone who touched this project in some way. However, what follows are a list of just a few of the major contributors:

• Vasil Vasilev (@vasilmkd)
• Raas Ahsan (@RaasAhsan)
• Fabio Labella (@SystemFw)
• Tim Spence (@TimWSpence)
• Michael Pilquist (@mpilquist)
• Frank Thomas (@fthomas)
• Ben Plommer (@bplommer)
• Jakub Kozłowski (@kubukoz)
• Emrys Ingersoll (@wemrysi)
• Chris Davenport (@ChristopherDavenport)

So many of you have spent late nights tracking down race conditions, wrestling with algorithms and data structures that are nearly unprecedented, conceptualizing immensely complex abstractions and higher-order concepts in various instantiations and applications, engaging in enthusiastic discussion with countless users in various forums, and so much more. This triumph belongs to all of you.

I would also like to sincerely thank everyone who has, over the years, provided countless insightful discussions and opinions which have shaped the final result in ways both subtle and profound.

Overview

Cats Effect 3 represents an essentially complete rewrite of Cats Effect, starting from first principles and taking into account everything we've discovered and learned over the years. We went back to the drawing board on the most fundamental elements of the calculus and re-thought them from the ground up to be more compositional, more powerful, more expressive, and more amenable to high-performance implementations. As with any major reconstitution of a non-trivial framework, it would be impossible to enumerate every change individually. Thus, we will have to content ourselves with a few highlights.

If you have an interest in how the development of Cats Effect 3 unfolded, you are invited to peruse the following chronology. Each of the release notes linked below contains a thorough description of the major changes which arrived in the corresponding build:

1. Milestone 1
2. Milestone 2

... (truncated)

Commits

• afbbdec Disabled scaladoc generation on 3.0.0-RC2 for ScalaJS kernel
• dedfede Merge pull request #1857 from vasilmkd/scala3rc2
• a116a5d Merge pull request #1854 from typelevel/topic/fix-mima-1837
• b1fd8fa Upgrade Scala 3 to RC2
• 6cd0607 add MiMa exclusion
• 4a3d506 Merge pull request #1845 from gvolpe/gvolpe/nix-shell
• 7558a4e Merge pull request #1837 from vasilmkd/unused
• 57f99cc Address PR comments
• fd20080 Fix MonadCancel docs
• db6ac3d Document how to build the site
• Additional commits viewable in compare view

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Superseded by #137.