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trait Cloneable[+T <: AnyRef] extends AnyRef {
  def create(): T
  override def clone(): T = create()
}

class A(var a: Int) extends Cloneable[A] {
  def create(): A = new A(a)
}

class B(aa: Int, var b: Int) extends A(aa) with Cloneable[B] {

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object Wat {
  trait TypeSum[T, U] {
    type SumType

    def add(t: T, u: U): SumType
  }

  implicit def unitLeft[T]: TypeSum[Unit, T] = new TypeSum[Unit, T] {
    type SumType = T
    def add(u: Unit, t: T) = t

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/* NSC -- new Scala compiler
 * Copyright 2005-2010 LAMP/EPFL
 * @author Paul Phillips
 */

package scala.tools.nsc
package util

import java.util.concurrent.{ Future, TimeUnit }
import java.lang.reflect.{ Modifier, Field, Method => JMethod }

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CmdUtils.CreateCommand({
  names: ["java"],
  arguments: [{role: "object",
               nountype: noun_arb_text,
               label: "search criteria"}],
  icon: "http://www.sun.com/favicon.ico",
  preview: "Searches The Java 6 API.",
  help: "Enter the name of the Java class or package for which you would like to see the documentation.",
  author: {name: "KS", email: "tss@cornbread.com"},

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/* sbt -- Simple Build Tool
 * Copyright 2011 Mark Harrah
 */
package sbt

	import java.io.File
	import java.net.URL
	import Project.ScopedKey
	import complete._
	import inc.Analysis

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Searching for changes to scala/collection/immutable/$colon$colon.class ...
Found       80 candidate revisions.

=== r17680 ===

commit e0f5e6e40716fbebee61a88ad998da3aa0eaea22
Author: odersky <odersky@5e8d7ff9-d8ef-0310-90f0-a4852d11357a>
Date:   Fri May 8 16:33:15 2009 +0000

    massive new collections checkin.

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% scala -cp /scala/trunk/build/pack/lib/scala-library.jar scal<tab>
scala.                                      scala.sys.
scala.actors.                               scala.sys.process.
scala.actors.remote.                        scala.testing.
scala.actors.scheduler.                     scala.text.
scala.actors.threadpool.                    scala.util.
scala.actors.threadpool.helpers.            scala.util.automata.
scala.actors.threadpool.locks.              scala.util.continuations.
scala.annotation.                           scala.util.control.
scala.annotation.target.                    scala.util.grammar.

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% scala -cp /scala/trunk/build/pack/lib/scala-library.jar scal<tab>
scala.                                      scala.sys.
scala.actors.                               scala.sys.process.
scala.actors.remote.                        scala.testing.
scala.actors.scheduler.                     scala.text.
scala.actors.threadpool.                    scala.util.
scala.actors.threadpool.helpers.            scala.util.automata.
scala.actors.threadpool.locks.              scala.util.continuations.
scala.annotation.                           scala.util.control.
scala.annotation.target.                    scala.util.grammar.

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[error] x Component manager should
[error]   x properly cache a file and then retrieve it to an unresolved component
[error]     null (FileChannelImpl.java:1166)
[error]     sun.nio.ch.FileChannelImpl$SharedFileLockTable.checkList(FileChannelImpl.java:1166)
[error]     sun.nio.ch.FileChannelImpl$SharedFileLockTable.add(FileChannelImpl.java:1068)
[error]     sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:868)
[error]     java.nio.channels.FileChannel.tryLock(FileChannel.java:962)
[error]     xsbt.boot.Locks$GlobalLock.withChannel$1(Locks.scala:65)
[error]     xsbt.boot.Locks$GlobalLock.withChannelRetries$1(Locks.scala:58)
[error]     xsbt.boot.Locks$GlobalLock$$anonfun$withFileLock$1.apply(Locks.scala:79)

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Razvan Cojocaru pub@razie.com
to	scala-user@googlegroups.com
date	Tue, Sep 13, 2011 at 11:07 AM
subject	[scala-user] unexpected REPL equals

The REPL unexpectedly calls equals with a String - this behavior is new in 2.9.1. – in the code below, I know the equals sucks but is short and used to work since 2.8
 
What to do? What to do?
 
$ scala