Well, the Scala developers are currently moving their build system to Scala. This means they can fully bootstrap their language/compiler, library and build syst

Well, the Scala developers are currently moving their build system to Scala. This means they can fully bootstrap their language/compiler, library and build system from one source language. The .NET port has only added some minor changes to the compiler (which have actually uncovered a bug in the compiler implementation!) and most of the .NET backend works as a compiler plugin, just like the JVM backend or the LLVM backend.