Rename dotty to scala.tools.dotty

[nicolasstucki]

Maybe we should move the compiler root package dotty to scala.tools.dotty and follow the same naming scheme as in Scala 2 (scala.tools.nsc).

This would make it possible to access package-private members of the library within the compiler. There are some use cases within the metaprogramming API where this might help to remove unnecessary classes from the library (see #10222).

[odersky]

But then it would be scala.tools.dotty.tools.dotc. Or would we have scala.tools.dotc directly, and also have repl and backend in scala.tools?

The dotty compiler does not necessarily need to live inside the scala package. For instance javac still lives in com.sun.tools.

[smarter]

Java doesn't have nested packages though. We want to allow the scala 2 and scala 3 compiler jar to coexist on the same classpath, so if we were to move, we'd have to put everything in scala.dotc or scala.tools.dotc.

[som-snytt]

Plus one for scala.tools.dotc, speaking as someone who just moved code from Scala 2 and had to pick a package.

It's worth adding that Scala 2 has a much richer ecosystem of util packages. I think I'm being sarcastic, but I can't be sure.

Also plus one for scala.tools.repl in the hope that eventually there will be a common front end with variant backend implementations.

As a caveat, "Where does my test file go in Scala 3?" is still a minor research project for me, so my take is necessarily naive.

[dwijnand]

This would make it possible to access package-private members of the library within the compiler.

On the other hand that adds yet-another external users of scala's package privates...

[odersky]

We decided not to act on this right now.