Scala2 macro was experimental, so it may not be planned to support all features.
However, features used in many libraries have been lost, and some OSS are difficult to migrate.
And I am one of them.
Has the equivalent of Parsers been removed?
The Quasiquote and Parsers features were very efficient for building uncertain Trees.
Referencing unknown types at the time the Macro is expanded, and expanding variable length parameters are difficult in Scala3’s macro.