Scala 3 provides a toolbox full of metaprogramming features, which are safer, more robust, and much more stable than their counterparts in Scala 2. Implementing macro libraries in Scala 3 is simpler and the resulting libraries are easier to maintain across future versions of Scala. The improvements come at a price: the metaprogramming facilities have been re-designed from the ground up. In consequence, existing macro libraries need to be ported to the new interfaces.
In the Macros section, you will find helpful content to port your macros code to Scala 3.