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TaskKey[Unit]("output-empty") <<= classDirectory in Configurations.Compile map { outputDirectory =>
def classes = (outputDirectory ** "*.class").get
if(!classes.isEmpty) sys.error("Classes existed:\n\t" + classes.mkString("\n\t")) else ()
}
// apparently Travis CI stopped allowing long file names
// it fails with the default setting of 255 characters so
// we have to set lower limit ourselves
scalacOptions ++= Seq("-Xmax-classfile-name", "240")
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