title: Scala 2.10-M1 and 2.9 same time on Devel Machine?
body: <p><strong>Edit:</strong><br>
  Got it sorted, SCALA_HOME + /bin to PATH sets the default interpreter; i.e. typing "scala" from bash prompt invokes 2.9.1 in my case. Just downloaded 2.10.0.M1.  Invoking /path/to/2.10/bin/scala from bash brings up 2.10 REPL.</p>
  
  <p>I'll just add a terminal alias for 2.10 so I don't have to type out the path manually.</p>
  
  <p><strong>Original:</strong><br>
  Do I need a guest VM to pull this off, or in Linux, can I somehow run 2.10 and 2.9 side-by-side?</p>
  
  <p>Basically, I'd like to experiment with 2.10-M1 reflection and see what runtime havoc I can wreak on case classes while continuing with general 2.9.1 development.</p>
  
  <p>If not, a Kotlin-esque web demo sure would be nice to mess around with during the 2.10 evolution...</p>