Fix repl/assembly when YARN enabled

project/SparkBuild.scala

@@ -36,7 +36,7 @@ object SparkBuild extends Build {
 
   lazy val core = Project("core", file("core"), settings = coreSettings)
 
-  lazy val repl = Project("repl", file("repl"), settings = replSettings) dependsOn (core) dependsOn(bagel) dependsOn(mllib)
+  lazy val repl = Project("repl", file("repl"), settings = replSettings) dependsOn(core) dependsOn(bagel) dependsOn(mllib) dependsOn(maybeYarn:_*)
 
   lazy val examples = Project("examples", file("examples"), settings = examplesSettings) dependsOn (core) dependsOn (streaming) dependsOn(mllib)
 
@@ -62,8 +62,9 @@ object SparkBuild extends Build {
   }
 
   // Conditionally include the yarn sub-project
-  lazy val maybeYarn = if(isYarnMode) Seq[ProjectReference](yarn) else Seq[ProjectReference]()
-  lazy val allProjects = Seq[ProjectReference](core, repl, examples, bagel, streaming, mllib, tools) ++ maybeYarn
+  lazy val maybeYarn = if(isYarnMode) Seq[ClasspathDependency](yarn) else Seq[ClasspathDependency]()
+  lazy val maybeYarnRef = if(isYarnMode) Seq[ProjectReference](yarn) else Seq[ProjectReference]()
+  lazy val allProjects = Seq[ProjectReference](core, repl, examples, bagel, streaming, mllib, tools) ++ maybeYarnRef
 
   def sharedSettings = Defaults.defaultSettings ++ Seq(
     organization := "org.spark-project",