diff --git a/util/collection/Rewrite.scala b/util/collection/Rewrite.scala
deleted file mode 100644
index 40b40add4..000000000
--- a/util/collection/Rewrite.scala
+++ /dev/null
@@ -1,42 +0,0 @@
-/* sbt -- Simple Build Tool
- * Copyright 2010 Mark Harrah
- */
-package sbt
-
-import Types._
-
-trait Rewrite[A[_]]
-{
-	def apply[T](node: A[T], rewrite: Rewrite[A]): A[T]
-}
-object Rewrite
-{
-	def Id[A[_]]: Rewrite[A] = new Rewrite[A] { def apply[T](node: A[T], rewrite: Rewrite[A]) = node }
-
-	implicit def specificF[T](f: T => T): Rewrite[Const[T]#Apply] = new Rewrite[Const[T]#Apply] {
-		def apply[S](node:T, rewrite: Rewrite[Const[T]#Apply]): T = f(node)
-	}
-	implicit def pToRewrite[A[_]](p: Param[A,A] => Unit): Rewrite[A] = toRewrite(Param.pToT(p))
-	implicit def toRewrite[A[_]](f: A ~> A): Rewrite[A] = new Rewrite[A] {
-		def apply[T](node: A[T], rewrite:Rewrite[A]) = f(node)
-	}
-	def compose[A[_]](a: Rewrite[A], b: Rewrite[A]): Rewrite[A] =
-		new Rewrite[A] {
-			def apply[T](node: A[T], rewrite: Rewrite[A]) =
-				a(b(node, rewrite), rewrite)
-		}
-	implicit def rewriteOps[A[_]](outer: Rewrite[A]): RewriteOps[A] =
-		new RewriteOps[A] {
-			def ∙(g: A ~> A): Rewrite[A] = compose(outer, g)
-			def andThen(g: A ~> A): Rewrite[A] = compose(g, outer)
-			def ∙(g: Rewrite[A]): Rewrite[A] = compose(outer, g)
-			def andThen(g: Rewrite[A]): Rewrite[A] = compose(g, outer)
-		}
-	def apply[A[_], T](value: A[T])(implicit rewrite: Rewrite[A]): A[T] = rewrite(value, rewrite)
-}
-trait RewriteOps[A[_]]
-{
-	def andThen(g: A ~> A): Rewrite[A]
-	def ∙(g: A ~> A): Rewrite[A]
-	def ∙(g: Rewrite[A]): Rewrite[A]
-}
\ No newline at end of file
diff --git a/util/collection/src/test/scala/RewriteTest.scala b/util/collection/src/test/scala/RewriteTest.scala
deleted file mode 100644
index c2ca1b237..000000000
--- a/util/collection/src/test/scala/RewriteTest.scala
+++ /dev/null
@@ -1,50 +0,0 @@
-/* sbt -- Simple Build Tool
- * Copyright 2010 Mark Harrah
- */
-package sbt
-
-import Types._
-
-object RewriteTest
-{
-	// dist and add0 show the awkwardness when not just manipulating superstructure:
-	//  would have to constrain the parameters to Term to be instances of Zero/Eq somehow
-	val dist: Rewrite[Term] = (p: Param[Term, Term]) => p.ret( p.in match {
-		case Add(Mult(a,b),Mult(c,d)) if a == c=> Mult(a, Add(b,d))
-		case x => x
-	})
-	val add0: Rewrite[Term] = (p: Param[Term, Term]) => p.ret( p.in match {
-		case Add(V(0), y) => y
-		case Add(x, V(0)) => x
-		case x => x
-	})
-	val rewriteBU= new Rewrite[Term] {
-		def apply[T](node: Term[T], rewrite: Rewrite[Term]) = {
-			def r[T](node: Term[T]) = rewrite(node, rewrite)
-			node match {
-				case Add(x, y) => Add(r(x), r(y))
-				case Mult(x, y) => Mult(r(x), r(y))
-				case x => x
-			}
-		}
-	}
-
-	val d2 = dist ∙ add0 ∙ rewriteBU
-
-	implicit def toV(t: Int): V[Int] = V(t)
-	implicit def toVar(s: String): Var[Int] = Var[Int](s)
-
-	val t1: Term[Int] = Add(Mult(3,4), Mult(4, 5))
-	val t2: Term[Int] = Add(Mult(4,4), Mult(4, 5))
-	val t3: Term[Int] = Add(Mult(Add("x", 0),4), Mult("x", 5))
-
-	println( Rewrite(t1)(d2) )
-	println( Rewrite(t2)(d2) )
-	println( Rewrite(t3)(d2) )
-}
-
-sealed trait Term[T]
-final case class Add[T](a: Term[T], b: Term[T]) extends Term[T]
-final case class Mult[T](a: Term[T], b: Term[T]) extends Term[T]
-final case class V[T](v: T) extends Term[T]
-final case class Var[T](name: String) extends Term[T]