diff --git a/compile/AnalyzingCompiler.scala b/compile/AnalyzingCompiler.scala
index a3e856d70..923d82c4a 100644
--- a/compile/AnalyzingCompiler.scala
+++ b/compile/AnalyzingCompiler.scala
@@ -41,7 +41,7 @@ class AnalyzingCompiler(val scalaInstance: ScalaInstance, val manager: Component
 	def console(classpath: Seq[File], options: Seq[String], initialCommands: String, log: Logger)(loader: Option[ClassLoader] = None, bindings: Seq[(String, Any)] = Nil): Unit =
 	{
 		val arguments = new CompilerArguments(scalaInstance, cp)
-		val classpathString = CompilerArguments.absString(arguments.finishClasspath(classpath ++ jlineJar))
+		val classpathString = CompilerArguments.absString(arguments.finishClasspath(classpath))
 		val bootClasspath = if(cp.autoBoot) arguments.createBootClasspath else ""
 		val (names, values) = bindings.unzip
 		call("xsbt.ConsoleInterface", log)(
@@ -80,7 +80,4 @@ class AnalyzingCompiler(val scalaInstance: ScalaInstance, val manager: Component
 		new classpath.DualLoader(scalaLoader, notXsbtiFilter, x => true, sbtLoader, xsbtiFilter, x => false)
 	}
 	override def toString = "Analyzing compiler (Scala " + scalaInstance.actualVersion + ")"
-	lazy val jlineJar =
-		try { IO.classLocationFile[jline.ConsoleReader] :: Nil }
-		catch { case e: Exception => Nil }
 }
\ No newline at end of file
diff --git a/compile/src/test/scala/CompileTest.scala b/compile/src/test/scala/CompileTest.scala
index 2c2332e2c..f30d600f7 100644
--- a/compile/src/test/scala/CompileTest.scala
+++ b/compile/src/test/scala/CompileTest.scala
@@ -56,8 +56,8 @@ object CompileTest extends Specification
 	private def isMissingRequirementError(t: Throwable) = t.getClass.getName == "scala.tools.nsc.MissingRequirementError"
 	private def testClasspath(scalaVersion: String) =
 		WithCompiler.launcher { (launch, log) =>
-			def compiler(autoBoot: Boolean, compilerOnClasspath: Boolean): RawCompiler =
-				new RawCompiler(ScalaInstance(scalaVersion, launch), new ClasspathOptions(autoBoot, compilerOnClasspath, true), log)
+			def compiler(bootLibrary: Boolean, compilerOnClasspath: Boolean): RawCompiler =
+				new RawCompiler(ScalaInstance(scalaVersion, launch), new ClasspathOptions(bootLibrary, compilerOnClasspath, true, true), log)
 
 			val callback = new xsbti.TestCallback
 				
diff --git a/main/Aggregation.scala b/main/Aggregation.scala
index ac8b0e345..8e314b0b3 100644
--- a/main/Aggregation.scala
+++ b/main/Aggregation.scala
@@ -11,6 +11,7 @@ package sbt
 	import sbt.complete.Parser
 	import java.net.URI
 	import Parser._
+	import collection.mutable
 
 sealed trait Aggregation
 final object Aggregation
@@ -24,16 +25,19 @@ final object Aggregation
 
 	final case class KeyValue[+T](key: ScopedKey[_], value: T)
 	def getTasks[T](key: ScopedKey[T], structure: BuildStructure, transitive: Boolean): Seq[KeyValue[T]] =
-	{
-		val task = structure.data.get(key.scope, key.key).toList.map(t => KeyValue(key,t))
-		if(transitive) aggregateDeps(key, structure) ++ task else task
-	}
+		getTasks0(key, structure, transitive, new mutable.HashMap[(ScopedKey[_], Boolean), Seq[KeyValue[T]]])
+	private type Memo[T] = mutable.Map[(ScopedKey[_], Boolean), Seq[KeyValue[T]]]
+	private[this] def getTasks0[T](key: ScopedKey[T], structure: BuildStructure, transitive: Boolean, memo: Memo[T]): Seq[KeyValue[T]] =
+		memo.getOrElseUpdate( (key, transitive), {
+			val task = structure.data.get(key.scope, key.key).toList.map(t => KeyValue(key,t))
+			if(transitive) aggregateDeps(key, structure, memo) ++ task else task
+		})
 	def projectAggregate(key: ScopedKey[_], structure: BuildStructure): Seq[ProjectRef] =
 	{
 		val project = key.scope.project.toOption.flatMap { ref => Project.getProjectForReference(ref, structure) }
 		project match { case Some(p) => p.aggregate; case None => Nil }
 	}
-	def aggregateDeps[T](key: ScopedKey[T], structure: BuildStructure): Seq[KeyValue[T]] =
+	private[this] def aggregateDeps[T](key: ScopedKey[T], structure: BuildStructure, memo: Memo[T]): Seq[KeyValue[T]] =
 	{
 		val aggregated = aggregate in Scope.fillTaskAxis(key.scope, key.key) get structure.data getOrElse Enabled
 		val (agg, transitive) =
diff --git a/tasks/src/test/scala/DemoTask.scala b/tasks/src/test/scala/DemoTask.scala
index b59670967..fab5d7682 100644
--- a/tasks/src/test/scala/DemoTask.scala
+++ b/tasks/src/test/scala/DemoTask.scala
@@ -112,7 +112,7 @@ object Task
 		val uniformIn = tasks
 		def work(mixed: Results[HNil], uniform: Seq[Result[Uniform]]) = {
 			val inc = failures(uniform)
-			if(inc.isEmpty) f(uniform) else throw Incomplete(causes = inc)
+			if(inc.isEmpty) f(uniform) else throw Incomplete(None, causes = inc)
 		}
 	}
 	def toNode[T, In <: HList](in: Tasks[In], f: Results[In] => Either[Task[T], T]): Node[Task, T] = new Node[Task, T] {
@@ -125,12 +125,12 @@ object Task
 	def allM[In <: HList]: Results[In] => In = in =>
 	{
 		val incs = failuresM(in)
-		if(incs.isEmpty) in.down(Result.tryValue) else throw Incomplete(causes = incs)
+		if(incs.isEmpty) in.down(Result.tryValue) else throw Incomplete(None, causes = incs)
 	}
 	def all[D]: Seq[Result[D]] => Seq[D] = in =>
 	{
 		val incs = failures(in)
-		if(incs.isEmpty) in.map(Result.tryValue.apply[D]) else throw Incomplete(causes = incs)
+		if(incs.isEmpty) in.map(Result.tryValue.apply[D]) else throw Incomplete(None, causes = incs)
 	}
 	def failuresM[In <: HList]: Results[In] => Seq[Incomplete] = x => failures[Any](x.toList)
 	def failures[A]: Seq[Result[A]] => Seq[Incomplete] = _.collect { case Inc(i) => i }
diff --git a/tasks/src/test/scala/Test.scala b/tasks/src/test/scala/Test.scala
index 14cf59948..31c38625b 100644
--- a/tasks/src/test/scala/Test.scala
+++ b/tasks/src/test/scala/Test.scala
@@ -27,7 +27,7 @@ object Test
 		case Value(aa) :^: Value(bb) :^: Value(cc) :^: KNil => aa + " " + bb + " " + cc
 		case x =>
 			val cs = x.toList.collect { case Inc(x) => x } // workaround for double definition bug
-			throw Incomplete(causes = cs)
+			throw Incomplete(None, causes = cs)
 	}
 	val d2 = i32 mapR f
 	val f2: Values => Task[Any] = {
diff --git a/tasks/src/test/scala/checkResult.scala b/tasks/src/test/scala/checkResult.scala
index 8459b143c..2279a7c93 100644
--- a/tasks/src/test/scala/checkResult.scala
+++ b/tasks/src/test/scala/checkResult.scala
@@ -18,7 +18,7 @@ object checkResult
 		catch
 		{
 			case i: Incomplete =>
-				println(Incomplete.show(i, true))
+				println(i)
 				"One or more tasks failed" |: false
 			case e =>
 				e.printStackTrace