$ sbt compile
[info] Loading global plugins from /.sbt/1.0/plugins
[info] Loading settings for project from plugins.sbt ...
[info] Loading settings for project root from build.sbt ...
[info] Executing in batch mode. For better performance use sbt's shell
[success] Total time: 2 s, completed
[info] Updating ...
[info] Done updating.
[warn] ~/services/NewService.scala:4:7: Calling services from services is not allowed.
[warn]   val test1 = ExistingService
[warn]       ^
[warn] one warnings found
[info] Done compiling.
[success] Total time: 36 s, completed