> + compile

$ exists lib/target/scala-2.11
$ exists lib/target/scala-2.10
$ exists sbt-foo/target/scala-2.10
-$ exists sbt-foo/target/scala-2.11

> clean
> + libProj/compile

$ exists lib/target/scala-2.11
$ exists lib/target/scala-2.10
-$ exists sbt-foo/target/scala-2.10
-$ exists sbt-foo/target/scala-2.11

> clean
> ++ 2.11.1 compile

$ exists lib/target/scala-2.11
-$ exists lib/target/scala-2.10
$ exists sbt-foo/target/scala-2.10
-$ exists sbt-foo/target/scala-2.11

> clean
> ++ 2.10.4 compile

-$ exists lib/target/scala-2.11
$ exists lib/target/scala-2.10
$ exists sbt-foo/target/scala-2.10
-$ exists sbt-foo/target/scala-2.11

> clean
> ++ 2.11.5 compile

$ exists lib/target/scala-2.11
-$ exists lib/target/scala-2.10
$ exists sbt-foo/target/scala-2.10
-$ exists sbt-foo/target/scala-2.11

> clean
> ++ 2.11.5! compile

$ exists lib/target/scala-2.11
-$ exists lib/target/scala-2.10
-$ exists sbt-foo/target/scala-2.10
$ exists sbt-foo/target/scala-2.11
