Issues

• Bad overload resolution with package object extension

  fixed in Scala 3
  scala/bug#13149 · Filter by author som-snytt opened on Jan 7, 2026 · Backlog

• IntMap / LongMap.tail very slow

  help wantedlibrary:collections
  scala/bug#13148 · Filter by author OndrejSpanel opened on Jan 6, 2026 · Backlog

• Incorrect generic signature with shadowing type parameter

  scala/bug#13144 · Filter by author lrytz opened on Dec 8, 2025 · Backlog

• Usage of Java annotation-with-class-parameter on Scala 3 class causes exception when compiling Scala 2 class

  tastyreader
  scala/bug#13143 · Filter by author jveldhuizen opened on Dec 8, 2025 · Backlog
  1

• Missing acc_varargs flag when overriding a Java varargs method

  fixed in Scala 3java interopvarargs
  scala/bug#13137 · Filter by author lrytz opened on Oct 27, 2025 · Backlog

• False "cannot override a concrete member" error when referencing Scala 3 code

  tastyreader
  scala/bug#13135 · Filter by author jadenPete opened on Oct 24, 2025 · Backlog

• Scala 3 case class with varargs parameter can't be constructed in Scala 2

  tastyreader
  scala/bug#13126 · Filter by author jadenPete opened on Oct 1, 2025 · Backlog

• Cross-version inheritance hierarchy crashes compiler

  tastyreader
  scala/bug#13125 · Filter by author jadenPete opened on Oct 1, 2025 · Backlog

• Unsupported generic tuple error when using Scala 3 code in Scala 2

  tastyreader
  scala/bug#13124 · Filter by author jadenPete opened on Sep 22, 2025 · Backlog
  1

• Bad type inference for java stream's toArray

  fixed in Scala 3
  scala/bug#13123 · Filter by author He-Pin opened on Sep 22, 2025
  1

• Subclasses of Scala 3 classes falsely flagged as missing implementations

  tastyreader
  scala/bug#13122 · Filter by author jadenPete opened on Sep 19, 2025 · Backlog

• Certain concrete type projections written in Scala 3 can't be used in Scala 2

  tastyreader
  scala/bug#13114 · Filter by author jadenPete opened on Aug 12, 2025 · Backlog
  1

• Certain type aliases written in Scala 3 can't be used in Scala 2

  tastyreader
  scala/bug#13113 · Filter by author jadenPete opened on Aug 11, 2025 · Backlog
  4

• -Wtostring-interpolated warns on an if expression of type String

  lint
  scala/bug#13107 · Filter by author johnduffell opened on Jun 13, 2025 · Backlog
  1

• StackOverflowError when using implicit class compiled with Scala 3 in Scala 2

  scala/bug#13105 · Filter by author jadenPete opened on Jun 3, 2025
  1

• Type inference failure while picking among conversions

  fixed in Scala 3infer
  scala/bug#13102 · Filter by author vhminh opened on May 7, 2025
  2

• Some literals in patterns not processed

  scala/bug#13101 · Filter by author som-snytt opened on May 7, 2025

• Wide NumericRange.iterator could avoid IllegalArgumentException: More than Int.MaxValue elements.

  scala/bug#13100 · Filter by author retronym opened on Apr 29, 2025

• scala.util.Random.between(minInclusive, maxExclusive) overflow bug.

  help wantedlibrary
  scala/bug#13098 · Filter by author dragonfly-ai opened on Mar 14, 2025 · Backlog
  5

• spurious unchecked warning due to non-local return

  errors and warnings
  scala/bug#13096 · Filter by author lrytz opened on Mar 10, 2025

• Collection deserialization fails with cyclic object graph

  library:collections
  scala/bug#13092 · Filter by author lrytz opened on Mar 6, 2025
  2

• Incorrect typing under match with alternatives

  gadt
  scala/bug#13090 · Filter by author szeiger opened on Feb 25, 2025 · Backlog
  2

• 2.13 regression: false negative, missing unreachable warning after extractor returning Some

  errors and warningspatmat
  scala/bug#13085 · Filter by author SethTisue opened on Feb 12, 2025 · Backlog
  1

• Inference failure with -Ypartial-unification

  typer
  scala/bug#13082 · Filter by author lrytz opened on Jan 29, 2025 · Backlog
  1

• java.lang.NullPointerException: Cannot invoke "scala.reflect.internal.Types$Type.params()" because the return value of "scala.reflect.internal.Trees$Tree.tpe()" is null

  compiler crashfixed in Scala 3should not compile
  scala/bug#13079 · Filter by author domdorn opened on Jan 18, 2025 · Backlog
  2