This is a fast-track release to replace a broken release 3.6.0 that occurred during the Scala 3.6.0-RC1 release. It might contain bugs that would be have been fixed during the Release Candidate bugfixes period. We recommend waiting for the stable Scala 3.6.2 release.

Scala 3.6.0 should never be used to produce libraries. TASTy files produced by this version of the compiler are produced in the experimental mode. These outputs are not compatible with consumers using stable versions of the compiler.

See details in Scala 3.6.0 Post Mortem blogpost

Highlights of the release

Stabilise SIP-47 (Adding Clause Interleaving to method definitions) #20861
Implement SIP-57 - add runtimeChecked method and annotation #20987
Implement SIP-62 - For comprehension improvements #20522
Implement SIP-64 as non-experimental #21668
Make named tuples a standard feature #21680
Switch mapping of context bounds to using clauses in 3.6 #21257
Require named arguments for java defined annotations #21329

Other changes and fixes

Annotations

Tighten java annot value parsing #21650

Dependencies

REPL: JLine 3.27.0 (was 3.25.1) #21752
Scala 2.13.15 (was .14) #21648

Erasure

Fixes IllegalAccessError with Java package protected class #21362

Experimental: Capture Checking

Existential Capabilities #20566
Fix setup of CapSet arguments. #21309
Check all top-level covariant capture sets in checkNotUniversal #21428
Charge also dcs of local reaches to capture set of enclosing method #21443
No need to unbox if expected type is LhsProto #21508
Treat more closure parameter types as inferred #21583
Fixes for cleanup retains scheme #21350
Improve Contains handling #21361
Expand Capability types T to T^ only if no explicit capture set is given #21375
Tighten closure extractor in TreeInfo #21621

Experimental: Strict Equality

Fix #21392: Adjust canComparePredefined(Nothing, T) in explicit nulls #21504
Add tracking of NotNullInfo for Match, Case, Try trees (fix #21380) #21389

Experimental: Modularity

Revised given syntax #21208

Experimental: Global Initialization

Analyze object when selecting from package #21511
Fix bug in init checker while compiling scodec-bits community project #21574

Experimentals

[experimental feature] Support HOAS pattern with type variables for quote pattern matching #18271

Exports

Re-use attachment in exportForwarders to handle ambiguous overloads #21518
Allow export statements in AnyVal #21653

Extension Methods

Make right assoc ext method fwd refs error #21641

Inline

Fix: throw an error before assigning ErrorType when expanding constValue #21364

Implicits

Fix prioritization of givens over implicits #21226

JVM backend

Backend computes line number from source of position #21763

Linting

CheckUnused checks type param annotations #20549

Library

Finalize named tuples #21710

Match Types

Enable betterMatchTypeExtractors in >= 3.6 #21198
Do not propagate TypeErrors of ops from TypeComparer#tryAlso #21070
Fix #21402: Always allow type member extraction for stable scrutinees in match types. #21700
Add a 3.6-migration warning for MT lubbing #21336
Always interpret underscores inside patterns as type bounds #21718

Opaque Types

Capture the kse3 issue in test cases and close it #21260

Parser

Guard against recursive lower bounds in constraints #21587

Pattern Matching

Fix a bundle of patmat issues #21000

Pickling

Some fixes for AnnotatedTypes mapping #19957

Polyfunctions

Fix: Check if a PolyFunction TypeTree has no ByName parameters #21671

Presentation Compiler

Add regression test for issue 18726 #20318
Remove artificial CURSOR added to code in the completions #20899
Fix autoimports with using directives #21590

Quotes

Handle suspension due to macro call in arbitrary phases #21651
Have a better error message when healing types #21711
Bound TypeRepr by Matchable in Quotes #21377
Expr#show: Don't crash when the expression contains an unsupported type (like a SkolemType) #20494

Reflection

Add the possibility to create a typeSymbol in the Quotes API #20347
Fix stale symbols connected to lazy vals in macros #21559

Reporting

Add better error reporting for inlined non-immutable paths #21639
Only replace new errors by warnings under -migration #21289

REPL

Ignore best effort settings in repl and update docs #21540

Rewrites

Remove empty argument lists for classes with only context bounds #21513
Fix rewrite logic for old <function> _ syntax #21715
Remove the -rewrite option for typechecks methods in Quotes #21547
Add migration rewrite for non-named arguments in Java annotations #21397

Scaladoc

Only trim one newline when preprocessing the content of a markdown code snippet #21519
Filter opaque modifier from object documentation #21640
Bump Inkuire version to fix it for the new Scala versions #21611

Standard Library

Move NamedTuple.head to NamedTupleDecomposition #21308
Define binary symbolic compiletime ops as infix #21683

Transform

Fix treatment of separately compiled @Native methods in FirstTransform #21593
Three fixes to SAM type handling #21596
Always rewrite empty List() to Nil #21689
Add support for clauseInterleaving in JVM generic signatures #21709

Typeclass Derivation

Nicer error message in case a derived method has an explicit term param #21332

Typer

Calm param autotupling for overloads #21552
Survive inaccessible types when computing implicit scope #21589
Avoid cyclic errors forcing default arg types #21597
Fix incorrect caching with dependent method parameters #21699

Contributors

Thank you to all the contributors who made this release possible 🎉

According to git shortlog -sn --no-merges 3.5.2..3.6.1 these are:

   129  Martin Odersky
    35  Hamza REMMAL
    34  Dale Wijnand
    31  Eugene Flesselle
    31  Hamza Remmal
    30  Wojciech Mazur
    15  Kacper Korban
    12  Jamie Thompson
    11  Jan Chyb
    11  Katarzyna Marek
     9  noti0na1
     9  rochala
     8  Adrien Piquerez
     8  Matt Bovel
     7  Som Snytt
     7  dependabot[bot]
     6  Yichen Xu
     5  EnzeXing
     5  Fengyun Liu
     5  Guillaume Martres
     5  Sébastien Doeraene
     4  Tomasz Godzik
     4  kasiaMarek
     3  Martin Duhem
     3  Oliver Bracevac
     3  Piotr Chabelski
     2  Aleksander Rainko
     2  David Hua
     2  Florian3k
     2  Friendseeker
     2  HarrisL2
     2  Joel Wilsson
     2  Jędrzej Rochala
     2  Kenji Yoshida
     2  Seth Tisue
     1  Eugene Yokota
     1  Georgi Krastev
     1  Kavin Satheeskumar
     1  Lorenzo Gabriele
     1  Michał Pałka
     1  Michel Charpentier
     1  Ondrej Lhotak
     1  Raphael Jolly
     1  Yuito Murase
     1  crunchyfrog
     1  friendseeker
     1  philippus

scala/scala3 3.6.1 on GitHub