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  • with the corollary that as much of the language as possible should be defined in importable packages/modules as possible Commented Nov 11, 2014 at 10:37
  • Yes, but not necessarily. For instance, the compiler of Scala happens to be written in Scala, but when you set the Scala version in sbt, it is just fetched as a Jar and used to compile your sources. Even if it was an opaque binary, that would do as well. Now, there are reasons to define as much of the language as possible should be defined in importable packages, but those are covered in amon's answer Commented Nov 11, 2014 at 16:36