This release is nearly identical to 3.3.0-RC1. The only difference is that 3.3.0-RC1 generated output with incorrect TASTy version.

The following changelog is identical to the changelog of 3.3.0-RC1.

Highlights of the release

Stabilize new lazy vals #16614
Experimental Macro annotations #16392 #16454 #16534
Fix stability check for inline parameters #15511
Make fewerBraces a standard feature #16297
Add new front-end phase for unused entities and add support for unused imports #16157
Implement -Wvalue-discard warning #15975
Introduce boundary/break control abstraction. #16612

Other changes and fixes

Annotations

Support use-site meta-annotations #16445

Desugaring

Reuse typed prefix for applyDynamic and applyDynamicNamed #16552
Fix object selftype match error #16441

Erasure

Dealias before checking for outer references in types #16525
Fix generic signature for type params bounded by primitive #16442
Avoid EmptyScope.cloneScope crashing, eg on missing references #16314

GADTs

Inline GADT state restoring in TypeComparer #16564
Add extension/conversion to GADT selection healing #16638

Incremental compilation

Unpickle arguments of parent constructors in Templates lazily #16688

Initialization

Fix #16438: Supply dummy args for erroneous parent call in init check #16448

Inline

Dealias in ConstantValue, for inline if cond #16652
Set Span for top level annotations generated in PostTyper #16378
Interpolate any type vars from comparing against SelectionProto #16348
Handle binding of beta reduced inlined lambdas #16377
Do not add dummy RHS to abstract inline methods #16510
Warn on inline given aliases with functions as RHS #16499
Support inline overrides in value classes #16523

Java interop

Represent Java annotations as interfaces so they can be extended, and disallow various misuses of them #16260

Opaque Types

Delay opaque alias checking until PostTyper #16644

Overloading

Handle context function arguments in overloading resolution #16511

Parser

Improve support for Unicode supplementary characters in identifiers and string interpolation (as in Scala 2) #16278
Require indent after colon at EOL #16466
Help givens return refined types #16293

Pattern Matching

Tweak AvoidMap's derivedSelect #16563
Space: Use RHS of & when refining subtypes #16573
Freeze constraints in a condition check of maximiseType #16526
Restrict syntax of typed patterns #16150
Test case to show that #16252 works with transparent #16262
Support inline unapplySeq and with leading given parameters #16358
Handle sealed prefixes in exh checking #16621
Detect irrefutable quoted patterns #16674

Pickling

Allow case classes with up to 254 parameters #16501
Correctly unpickle Scala 2 private case classes in traits #16519

Polyfunctions

Fix #9996: Crash with function accepting polymorphic function type with singleton result #16327

Quotes

Remove contents of inline methods #16345
Fix errors in explicit type annotations in inline match cases #16257
Handle macro annotation suspends and crashes #16509
Fix macro annotations spliceOwner #16513

REPL

REPL: Fix crash when printing instances of value classes #16393
Attempt to fix completion crash #16267
Fix REPL shadowing bug #16389
Open up for extensibility #16276
Don't crash if completions throw #16687

Reflection

Fix reflect typeMembers to return all members #15033
Deprecate reflect Flags.Static #16568

Reporting

Suppress follow-on errors for erroneous import qualifiers #16658
Fix order in which errors are reported for assignment to val #16660
Fix class name in error message #16635
Make refined type printing more source compatible #16303
Add error hint on local inline def used in quotes #16572
Fix Text wrapping #16277
Fix -Wunused:import registering constructor <init> instead of its owner (also fix false positive for enum) #16661
Fix #16675 : -Wunused false positive on case class generated method, due to flags used to distinguish case accessors. #16683
Fix #16680 by registering Ident not containing a symbol #16689
Fix #16682: CheckUnused missed some used symbols #16690
Fix the non-miniphase tree traverser #16684

Scala-JS

Fix #14289: Accept Ident refs to js.native in native member rhs. #16185

Standard Library

Add CanEqual instance for Map #15886
Refine Tuple.Append return type #16140

TASTy format

Make it a fatal error if erasure cannot resolve a type #16373

Tooling

Add -Yimports compiler flag #16218
Allow BooleanSettings to be set with a colon #16425

Transform

Avoid stackoverflow in ExplicitOuter #16381
Make lazy vals run on non-fallback graal image - remove dynamic reflection #16346
Patch to avoid crash in #16351 #16354
Don't treat package object's <init> methods as package members #16667
Space: Refine isSubspace property & an example #16574

Typer

Drop requirement that self types are closed #16648
Disallow constructor params from appearing in parent types for soundness #16664
Don't search implicit arguments in singleton type prefix #16490
Don't rely on isProvisional to determine whether atoms computed #16489
Support signature polymorphic methods (MethodHandle and VarHandle) #16225
Prefer parameterless alternatives during ambiguous overload resolution #16315
Fix calculation to drop transparent classes #16344
Test case for issue 16311 #16317
Skip caching provisional OrType atoms #16295
Avoid cyclic references due to experimental check when inlining #16195
Track type variable dependencies to guide instantiation decisions #16042
Two fixes to constraint solving #16353
Fix regression in cyclic constraint handling #16514
Sharpen range approximation for applied types with capture set ranges #16261
Cut the Gordian Knot: Don't widen unions to transparent #15642
Fix widening logic to keep instantiation within bounds #16417
Skip ambiguous reference error when symbols are aliases #16401
Avoid incorrect simplifications when updating bounds in the constraint #16410
Take @targetName into account when resolving extension methods #16487
Improve ClassTag handling to avoid invalid ClassTag generation and inference failure #16492
Fix extracting the elemType of a union of arrays #16569
Make sure annotations are typed in expression contexts #16699
Throw a type error when using hk-types in unions or intersections #16712

Contributors

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

According to git shortlog -sn --no-merges 3.2.2..3.3.0-RC1 these are:

   225 Martin Odersky
    73 Dale Wijnand
    58 Szymon Rodziewicz
    54 Nicolas Stucki
    48 Kamil Szewczyk
    48 Paul Coral
    30 Paweł Marks
    28 Florian3k
    28 Yichen Xu
    14 Guillaume Martres
     8 Fengyun Liu
     8 Michał Pałka
     7 Chris Birchall
     7 rochala
     6 Kacper Korban
     6 Sébastien Doeraene
     6 jdudrak
     5 Seth Tisue
     5 Som Snytt
     5 nizhikov
     4 Filip Zybała
     4 Jan Chyb
     4 Michael Pollmeier
     4 Natsu Kagami
     3 Jamie Thompson
     2 Alex
     2 Anatolii Kmetiuk
     2 Dmitrii Naumenko
     2 Lukas Rytz
     2 adampauls
     2 yoshinorin
     1 Alexander Slesarenko
     1 Chris Kipp
     1 Guillaume Raffin
     1 Jakub Kozłowski
     1 Jan-Pieter van den Heuvel
     1 Julien Richard-Foy
     1 Kenji Yoshida
     1 Philippus
     1 Szymon R
     1 Tim Spence
     1 s.bazarsadaev