This PR introduces changes that will help to ease the migration to Scala 3, but the code in this PR remains valid Scala 2 code.
In detail the changes are:
The type () is replaced with Unit (as Scala 3 seems to no longer accept () as a type)
The use of generic type projections (i.e. T#U) in the FunctionHelper class is avoided as these have been dropped in Scala 3
The ._1 and ._2 notations on Rise and DPIA expressions do not work in Scala 3 (I don't know why) I have replaced them with `1` and `2`
The `_` notation is also not accepted by Scala 3, I have replaced it with `__`
Returning anonymous object types (i.e. `def foo() = new Object { ... } has changed somehow and I have avoided this now altogether by giving the returned type names. This was mainly used in the DSLs.
I accommodated a change in the signature of the unapply method generated for case classes.
I removed some syntax that used Unicode symbols. This is not related to Scala 3 but has repeatedly led to problems to compile on systems where the file system does not support Unicode (as Scala generates a file with the class name for each class).
This PR introduces changes that will help to ease the migration to Scala 3, but the code in this PR remains valid Scala 2 code.
In detail the changes are:
()is replaced withUnit(as Scala 3 seems to no longer accept()as a type)T#U) in theFunctionHelperclass is avoided as these have been dropped in Scala 3._1and._2notations on Rise and DPIA expressions do not work in Scala 3 (I don't know why) I have replaced them with`1`and`2``_`notation is also not accepted by Scala 3, I have replaced it with`__`unapplymethod generated for case classes.