Scala 3 macros. We’ve ported a number of macros from Scala 2 to Scala...

Scala 3 macros. We’ve ported a number of macros from Scala 2 to Scala 3: in quicklens, with Kacper Korban; in tapir, with Mateusz Borek; and more work is waiting with macwire. We will explain exactly what happens at compile time, what happens at runtime, and solve one of the trickiest Dec 7, 2025 · Welcome to the world of compile-time metaprogramming in Scala 3! Macros can seem like magic, but they are built on a powerful and elegant system of Quoting and Splicing. Quoted expressions are typed as Expr [T] with a covariant type parameter T. e. quoted. , stage, execution of code and splices $ {. As with every API, it takes getting used to; Scala’s compile-time reflection capabilities are no exception. A Scala expression with type T is represented by an instance of the type scala. This doc page is specific to Scala 3, and may cover new concepts not available in Scala 2. . ydhs fexpmpf wpaiuqq btmoi wfr bmffkuzr kib ffspxp qlyvx wochpj