Scala 3 Migration Guide

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Scala 3 includes some features that were previously provided by a compiler plugin. This chapter gives more detail on how to migrate from using a specific compiler plugin to Scala 3.

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Contributors to this page:

• Compatibility Reference
• Source Level
• Classpath Level
• Runtime
• Metaprogramming
• Tour of the Migration Tools
• Scala 2 with -Xsource:3
• Scala 3 Migration Mode
• Migration Tutorial
• Prerequisites
• Porting an sbt Project (using sbt-scala3-migrate)
• Porting an sbt Project (by hand)
• Cross-Building a Macro Library
• Mixing Scala 2.13 and Scala 3 Macros
• Scala 3 Syntax Rewriting
• Incompatibility Table
• Syntactic Changes
• Dropped Features
• Contextual Abstractions
• Other Changed Features
• Type Checker
• Type Inference
• Compiler Options
• Compiler Options Lookup Table
• New Compiler Options
• Scaladoc settings compatibility between Scala2 and Scala3
• Compiler Plugins
• Kind Projector Migration
• External Resources

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