org.scala-lang:scala-library breaking changes

3.8.0

1,607 breaking changes, first published January 13, 2026.

• Removed scala.collection.ArrayOps.ArrayIterator.xs
  scala.collection.ArrayOps.ArrayIterator.xs was removed in org.scala-lang:scala-library 3.8.0 central.sonatype.com
• Removed scala.collection.Searching.Found$.andThen
  scala.collection.Searching.Found$.andThen was removed in org.scala-lang:scala-library 3.8.0 central.sonatype.com
• Removed scala.collection.Searching.Found$.compose
  scala.collection.Searching.Found$.compose was removed in org.scala-lang:scala-library 3.8.0 central.sonatype.com
• Removed scala.collection.Searching.InsertionPoint$.andThen
  scala.collection.Searching.InsertionPoint$.andThen was removed in org.scala-lang:scala-library 3.8.0 central.sonatype.com
• Removed scala.collection.Searching.InsertionPoint$.compose
  scala.collection.Searching.InsertionPoint$.compose was removed in org.scala-lang:scala-library 3.8.0 central.sonatype.com
• Signature changed scala.$eq$colon$eq.liftCo
  Was <F> scala..eq.colon.eq<F, F> liftCo(); now <F> scala..eq.colon.eq<Object, Object> liftCo(). central.sonatype.com
• Signature changed scala.$eq$colon$eq.liftContra
  Was <F> scala..eq.colon.eq<F, F> liftContra(); now <F> scala..eq.colon.eq<Object, Object> liftContra(). central.sonatype.com
• Signature changed scala.$eq$colon$eq.substituteBoth
  Was abstract <F> F substituteBoth(F); now abstract <F> Object substituteBoth(Object). central.sonatype.com
• Signature changed scala.$eq$colon$eq.substituteCo
  Was <F> F substituteCo(F); now <F> Object substituteCo(Object). central.sonatype.com
• Signature changed scala.$eq$colon$eq.substituteContra
  Was <F> F substituteContra(F); now <F> Object substituteContra(Object). central.sonatype.com

And 1,597 more in this version.

3.1.2-RC2

1 breaking change, first published January 13, 2026.

• Renamed -Xtarget
  Several compiler settings were renamed for consistency, so build scripts using the old names must be updated. github.com

3.1.1-RC1

2 breaking changes, first published January 13, 2026.

• Removed
  Plugin-related compiler settings were removed from the common settings set, so build configurations that pass them may need updating. github.com
• Behavior changed
  Code in other packages can no longer see members defined in the empty package. Move such members into a named package to keep them reachable. github.com

3.1.0-RC1

1 breaking change, first published January 13, 2026.

• Behavior changed
  Secondary constructors marked inline are rejected by the compiler, so such code must drop the inline modifier. github.com

3.0.2-RC1

5 breaking changes, first published January 13, 2026.

• Behavior changed
  Uses Java member lookup rules for .java sources in org.scala-lang:scala-library 3.0.2-RC1 github.com
• Behavior changed
  Stops inserting semicolons in conditions unless indented in org.scala-lang:scala-library 3.0.2-RC1 github.com
• Behavior changed
  Stops emitting Java generic signatures for constructors in org.scala-lang:scala-library 3.0.2-RC1 github.com
• Behavior changed
  Hides problematic static forwarders in org.scala-lang:scala-library 3.0.2-RC1 github.com
• Behavior changed isInstanceOf
  Restricts isInstanceOf[Null] checks in org.scala-lang:scala-library 3.0.2-RC1 github.com

3.0.1-RC1

2 breaking changes, first published January 13, 2026.

• Behavior changed
  Code that references self in a super constructor call now fails to compile. github.com
• Signature changed scala.collection.immutable.Nil.toArray
  IArray.toArray is deprecated because it is broken. Stop calling it and use another way to convert the array. central.sonatype.com

Check your code

These are the changes. To see which of them reach your code, scan a public repository, or have your coding agent call check_code with your manifest or lockfile over MCP. The API reads every change in every version, not only the newest. A fix pull request opens for the changes that reach a connected repository. Nothing merges or deploys.