another question: jar_library doesn't seems to support a

provides

attribute even though the docs imply that it does. compare http://pantsbuild.github.io/3rdparty_jvm.html#round-trip-dependencies with this error:

Exception message: Invalid target //:scalac-translation-plugin: JarLibrary received unknown arguments:
  provides = com.foursquare.i18n.plugin-gen-gettext_2.11 -> internal -> <http://nexus.prod.foursquare.com> (/Users/tdyas/Code/foursquare.web/build-support/pushdb)

and

JarLibrary

inherits from

Target

and not

JvmTarget