erikrozendaal/scala — comment on commit b9699f999da24f72dca65ecfb066b0ac3151f2b5
File: src/library/scala/collection/immutable/RedBlack.scala line 19
By dcsobral:

What is the gain of making it private? I could see having it private right from the beginning, but removing access to something that is public -- without even removing the code itself -- ought to bring some gain.

Sadly, it will make testing stuff on REPL a real pain.