Merge branch '#5812' of https://github.com/IDoCodingStuffs/dotty into #5812

Author: IDoCodingStuffs

sbt-dotty/sbt-test/source-dependencies/compactify/build.sbt

@@ -2,4 +2,4 @@ TaskKey[Unit]("output-empty") := {
   val outputDirectory = (classDirectory in Compile).value
   val classes = (outputDirectory ** "*.class").get
   if (classes.nonEmpty) sys.error("Classes existed:\n\t" + classes.mkString("\n\t")) else ()
-}
+}