Hello! We are excited to announce 0.25.0-RC2 of Dotty. In this version, following feedback of the community, we have improved compilation speeds when programming with givens. We have also made some improvements to the tuple API.
You can try out this version right now, from the comfort of your SBT, by visiting the home page and scrolling down to the "Create a Dotty Project" section.
Alternatively, you can try this version of Scala online via Scastie. Once you're there, click "Build Settings" and set "Target" to "Dotty".
Enjoy the ride🚀!
We have added a type
EmptyTuple to represent empty tuples. Previously empty tuples were represented by
Unit. This change was done so that all the tuples are a subtype of
Product. Now, tuples have the following type hierarchy:
Product -- Tuple -+- EmptyTuple | +- NonEmptyTuple -- *:[Head, Tail <: Tuple]
This change impacts existing type class derivation codebases in that they now should use
EmptyTuple instead of
Unit in the tuple context.
Dotty brings to the user an enhanced error reporting when it comes to programming with givens. This better error reporting, however, proved to be a trade-off. Sometimes it takes an unreasonable amount of time and space to compute a quality suggestion to the end user.
A number of users reported considerable slowdowns when it comes to programming with implicits. To address this issue, we have modified the logic for given imports suggestion. We introduced a per-run budget of 10 seconds, so it is guaranteed that it won't take longer than that time to compute all the given imports.
This default budget is configurable via a compiler flag
This change should speed up the compiler when it comes to programming with givens.
For more information, see PR #9167.
Thank you to all the contributors who made this release possible 🎉
git shortlog -sn --no-merges 0.24.0-RC1..0.25.0-RC2 these are:
190 Nicolas Stucki 175 Martin Odersky 67 Liu Fengyun 32 Guillaume Martres 17 Robert Stoll 17 bishabosha 9 Anatolii Kmetiuk 7 yu-croco 6 Reto Hablützel 5 Akhtiam Sakaev 5 odersky 4 Raphael Jolly 4 Ruslan Shevchenko 4 Olivier Blanvillain 3 Jamie Thompson 3 Chris Birchall 2 Radosław Waśko 2 Aleksander Boruch-Gruszecki 2 Eric Loots 2 Jens Kat 2 Miles Sabin 2 noti0na1 1 Krzysztof Bochenek 1 Seth Tisue 1 Tobias Kahlert 1 Yilin Wei 1 ansvonwa 1 FabioPinheiro 1 december32 1 yytyd 1 Ara Adkins 1 squid314 1 typeness 1 xuwei-k 1 Alex Zolotko 1 Julien Richard-Foy
If you want to get your hands dirty and contribute to Dotty, now is a good time to get involved! Head to our Getting Started page for new contributors, and have a look at some of the good first issues. They make perfect entry points into hacking on the compiler.
We are looking forward to having you join the team of contributors.
Dotty now has a set of widely-used community libraries that are built against every nightly Dotty snapshot. Currently, this includes shapeless, ScalaPB, algebra, scalatest, scopt and squants. Join our community build to make sure that our regression suite includes your library.