I am trying to use scoverage to test scala compiler, which I built from source by sbt.

At first when I didn't add "addSbtPlugin(...)" to my /project/plugins.sbt it worked all fine, both sbt compile and sbt test. But when I added that and run "sbt clean coverage test", it shows error:

error java.lang.ClassCastException: xsbt.API$ApiPhase cannot be cast to scala.tools.nsc.Global$GlobalPhase

I am using sbt version 0.13.7

Thanks in advance for any comments!