Highlights of the release

• Stop using custom fonts for Scaladoc to reduce javadoc jar size
  #26393
• Improve Java generic signatures for higher-kinded types, value classes
  #25540
  #25744
  #25631
• Exhaustiveness checking for sealed abstract Java classes
  #25788
• Actionable diagnostic for missing members
  #23572
• Warn on dubious negative literal syntax (- 42, -42.abs)
  #24163
• Scaladoc no longer crashes with an NPE on JDK 25
  #25779

Other changes and fixes

Backend

• Box bounded arguments of HKT result types in Java generic signatures
  #26787
• Handle HKT bounds in Java generic signatures
  #25744
• Emit acceptable Java generic signatures for HKTs
  #25540
• Unwrap refined types for Java generic signatures
  #25626
• Fix Java signatures for arrays of value classes
  #25631
• Fix generic signature of trait val setter
  #26374
• Fix: reliably decide whether to generate static forwarders
  #26510
• Fix issue with reading legal java cyclic signatures
  #26775
• Do not emit Java generic signatures for trait private val setters
  #26633
• Fix crash during generic signature emission for inner classes of type aliases
  #26202
• Parse Java annotations on wildcard type arguments
  #26187
• Test Java annotations on varargs element types
  #26188
• Fix generic signatures of forwarders containing value classes
  #25879
• Ignore @throws annotation on non-methods
  #26802

CI

• Use \n for missing methods patch
  #26133
• Fix #25712: Reset frozenConstraint in TypeComparer.init()
  #25766
• Enable assertions for tests and fix other issues
  #26168
• Skip mixed Scala-Java tests automatically on Scala.js
  #26139
• Fixes for the bisect script
  #26116
• Fix broken //> using jvm directive in the bisect script
  #26115
• Improvement: Add -Wunused:all to presentation-compiler
  #26113
• Restore cmdTests and bootstrappedOnlyCmdTests execution in CI
  #26082
• Deduplicate community build projects list
  #26054
• Promote t750 #25961
• Resurrect some Scala 2 tests for generic signatures
  #25736
• Fix main build: use vcBoxing instead of unboxedVCs
  #25710
• [tools] Improvements and cleanups to bisect script
  #25698
• Restore test #25671
• Add tests from #25703
• Add tests from #26813

Coverage

• Scoverage: Fix coverage parameterless select qualifier casts
  #26087
• Scoverage: Enable passing coverage tests
  #26090
• Scoverage: correctly detect curried constructor applications
  #26048
• Scoverage: fix broken warnings related to tail recursion and infinite loop
  detection #25941
• Scoverage: do not instrument methods that have too large bodies
  #25629
• Fix separate compilation tests failing under coverage
  #25604
• Ignore coverage probes in unused update analysis
  #26711

Dependency Upgrades

• Bump coursier to 2.1.25-M25 (was 2.1.25-M24)
  #26057
• Update scalajs-env-nodejs to 1.6.0
  #26095 Bump
  jekyll-sass-converter from 2.2.0 to 3.0.0 in /docs/_spec
  #25963
• Bump rouge from 3.30.0 to 4.7.0 in /docs/_spec
  #25964
• Update all dependencies #25959
• Update a few dependencies #25952
• Bump VirtusLab/scala-cli-setup from 1.11 to 1.13
  #25846

Desugaring

• Use updated params when desugaring macro context bounds
  #26206
• Desugaring: avoid patdef optimization for lazy vals
  #26770

Enums

• Regression test for #25723
  #26205
• Adjust error on bad enum #23080
• Fix memberType for constructor params
  #25669

Erasure

• Add regession test for #18099
  #26138
• Fix #26190: Copy erased flag into inline access proxies
  #26191

Experimental: Capture Checking

• Make type arguments to default methods InferredTypeTrees
  #25852

Implicits

• Also map types in Implicits.emitDictionary
  #26143
• Remove questionable transform of Select from SelectStatic
  #25620
• Fixes #24914 Treat equivalent candidates as divergent in implicit search
  #25910

Incremental Compilation

• Fix #25894: break cross-unit cyclic export on partial recompile
  #25900
• Ignore annotations no longer on the classpath in ExtractAPI
  #25889

Inline

• Add regression test for 12577.scala
  #26256
• [OpenCB Project Fix] Fixes #26015: Start of NoSpan in adaptToArgs fallBack
  #26017
• Fix regression: special case Symbol-less overloaded TermRefs in Inliner
  #26853
• Fix (#26178) private inline subclass access proxy bug
  #26176

Lambda Lift

• Fixes #25943: Track super-calls as call edges in LambdaLift
  #26029

Linting

• Improve unused check of variable in assignment body
  #24685
• Tweak -Wconf:help for correctness
  #25615
• Fix false unused-var warning on self-assignment reads (#26620)
  #26635

Opaque Types

• Fixes #25754: Preserve apply result type after beta reducing through opaque
  proxies #25988
• Fix crash on invalid opaque type in package
  #26118
• Add regression test for i15050
  #26110

Match Types

• Fix #25866: match-alias subtyping and wildcard appliedTo
  #25981

Parser

• Warn dubious negative literal syntax
  #24163
• Check ascription in valdef pattern
  #25597
• Parser: Recover from unclosed string literal errors
  #26763
• Warn if name of empty template has trailing colon
  #23907

Pattern Matching

• Fix crash when unapply returns a Boolean-deriving opaque type
  #26658
• Preserve GADT constraints until PatternMatcher
  #26805
• Make sealed abstract java classes exhaustive checkable
  #25788

Pickling

• Fixes #25947, #11043: Avoid JavaArrayType in synthesized classOf for
  structural calls #26028
• Fixes #25801: Handle TypeDefs in ensureHasSym
  #26011

Presentation Compiler

• Bugfix: Don't show errors from other files
  #26346
• Chore: Add batch semanticdb for Metals 2
  #26323
• Fix PcInlayHints crash on inlined trees from external dependencies
  #26385
• Improvement: fallback PC symbol location position to a classfile if no source
  exists #26454
• Fix outline compilation with string interpolation
  #26636

REPL

• Relax typer position assert in interactive mode
  #26130

Reporting

• Feat: Add actionable diagnostic for missing members
  #23572
• Use context.outers instead of owner chain to find class for suspicious
  top-level resolution #20717
• Include span of bad args if multiline
  #25699
• Add a test case extracted out of #25977
  #26058
• Optimize handling of -Yexplain-cycles
  #26061
• Display position in TreeChecker.checkType
  #25840
• Do not warn for package object at the top level
  #25826

Refactoring

• Delete dead code #26227
• Fix some typos #26230
• Delete dead LRUCache #26229
• Fix typo in Mode.toString #26223
• Remove dead large class detection
  #26212
• Fix typos in build file and EtaExpansion
  #25956
• Fix typos found by GitHub code analysis
  #25954
• Update remaining uses of Dotty to Scala 3
  #25953
• Fix warnings in Scaladoc tests
  #25919
• Remove obsolete checkBackendNames switch
  #25918
• Move generic signature tests to the right folder
  #25888
• Fix warnings in presentation-compiler
  #25827
• Fix typo in transparent #25753

Scala-JS

• Tolerate empty paths in JSPositions conversion
  #26140

Scaladoc

• Scaladoc snippets: fix Show all lines & Scastie popup theme bugs
  #26165
• Avoid NPE in Scaladoc signatures on JDK 25
  #25779
• Scaladoc: add fallback lookup from nearest package
  #26661
• Skip unresolved annotation trees (during TASTy loading)
  #26520
• Fix Scaladoc top package order to be alphabetical
  #26653
• Stop using custom fonts for Scaladoc
  #26393
• [DISC-18903] Remove jquery and hanging javascript assets.
  #22014

Security

• Bump jackson-* to 3.1.2 (was 2.15.1)
  #25785

SemanticDB

• Bugfix: Fix the issue and no longer show <?> which is invalid
  #26607

Standard Library

• Fixes #25702: Avoid AnyClass fallback in requiredClass
  #26010

Quotes

• Check that Closures refer to anonymous functions under -Xcheck-macros
  #26050

Transform

• Fix SAM conversion crash on @VarArgs trait method
  #26141

Typeclass Derivation

• Fix synthesis of mirrors for GADT with dependent type parameters
  #26080

Typer

• Fixes #24414: Fix StaleSymbolException in Namer.addChild after compilation
  suspension #26019
• Preserve type info when lifting stable arguments
  #26063
• Fixes #25856: Position not set crash in implicit search during import
  qualifier #26032
• Fixes #20010 Avoid crash on missing TASTy class references
  #25908
• Fixes #24719 Fix LazyAnnotation.tree reentrance in Namer.addChild
  #25909
• Fixes #24056 Dealias value class types in structural access
  #25907
• Regression test #25685
• Fix stale baseTypeCache after synthetic Product.Mirror parents added
  #26714
• Fix regression #26153 (in dotty-cps-async) use typer skolems as inline proxy's
  type #26563
• Fix mismatch between wrapArray and wrapArrayMethodName
  #26162

Value Classes

• Replicate value class erasure binary compat hack in GenericSignatures
  #25775