--- title: "scala-library Breaking Changes on Maven Central | Since.dev" description: "What each org.scala-lang:scala-library release removed, renamed or changed: 1,648 breaking changes in 8 versions on Maven Central, each with its source." canonical_url: https://since.dev/packages/maven/org.scala-lang:scala-library last_updated: 2026-01-13 --- # org.scala-lang:scala-library breaking changes Every breaking API change we have recorded in org.scala-lang:scala-library on Maven Central: 1,648 breaking changes in 8 versions. Below are its newest 6 versions, removals and renames first, each with its source. Newest change January 13, 2026 ## 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](https://central.sonatype.com/artifact/org.scala-lang/scala-library/3.8.0) - **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](https://central.sonatype.com/artifact/org.scala-lang/scala-library/3.8.0) - **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](https://central.sonatype.com/artifact/org.scala-lang/scala-library/3.8.0) - **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](https://central.sonatype.com/artifact/org.scala-lang/scala-library/3.8.0) - **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](https://central.sonatype.com/artifact/org.scala-lang/scala-library/3.8.0) - **Signature changed** `scala.$eq$colon$eq.liftCo` Was scala..eq.colon.eq liftCo(); now scala..eq.colon.eq liftCo(). [central.sonatype.com](https://central.sonatype.com/artifact/org.scala-lang/scala-library/3.8.0) - **Signature changed** `scala.$eq$colon$eq.liftContra` Was scala..eq.colon.eq liftContra(); now scala..eq.colon.eq liftContra(). [central.sonatype.com](https://central.sonatype.com/artifact/org.scala-lang/scala-library/3.8.0) - **Signature changed** `scala.$eq$colon$eq.substituteBoth` Was abstract F substituteBoth(F); now abstract Object substituteBoth(Object). [central.sonatype.com](https://central.sonatype.com/artifact/org.scala-lang/scala-library/3.8.0) - **Signature changed** `scala.$eq$colon$eq.substituteCo` Was F substituteCo(F); now Object substituteCo(Object). [central.sonatype.com](https://central.sonatype.com/artifact/org.scala-lang/scala-library/3.8.0) - **Signature changed** `scala.$eq$colon$eq.substituteContra` Was F substituteContra(F); now Object substituteContra(Object). [central.sonatype.com](https://central.sonatype.com/artifact/org.scala-lang/scala-library/3.8.0) 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](https://github.com/scala/scala3/releases/tag/3.1.2-RC2) ## 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](https://github.com/scala/scala3/releases/tag/3.1.1-RC1) - **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](https://github.com/scala/scala3/releases/tag/3.1.1-RC1) ## 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](https://github.com/scala/scala3/releases/tag/3.1.0-RC1) ## 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](https://github.com/scala/scala3/releases/tag/3.0.2-RC1) - **Behavior changed** Stops inserting semicolons in conditions unless indented in org.scala-lang:scala-library 3.0.2-RC1 [github.com](https://github.com/scala/scala3/releases/tag/3.0.2-RC1) - **Behavior changed** Stops emitting Java generic signatures for constructors in org.scala-lang:scala-library 3.0.2-RC1 [github.com](https://github.com/scala/scala3/releases/tag/3.0.2-RC1) - **Behavior changed** Hides problematic static forwarders in org.scala-lang:scala-library 3.0.2-RC1 [github.com](https://github.com/scala/scala3/releases/tag/3.0.2-RC1) - **Behavior changed** `isInstanceOf` Restricts isInstanceOf\[Null\] checks in org.scala-lang:scala-library 3.0.2-RC1 [github.com](https://github.com/scala/scala3/releases/tag/3.0.2-RC1) ## 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](https://github.com/scala/scala3/releases/tag/3.0.1-RC1) - **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](https://central.sonatype.com/artifact/org.scala-lang/scala-library/3.8.0) ## Check your code These are the changes. To see which of them reach your code, [scan a public repository](https://since.dev/scan.md), or have your coding agent call `check_code` with your manifest or lockfile over [MCP](https://since.dev/docs.md#mcp). [The API](https://since.dev/docs.md#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. ## Put your code on continuous maintenance. Scan a public repository now, or give your agent one line. [Scan a repository](https://since.dev/scan.md). Any public GitHub repository. 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