Scala 2.10.0 Milestone 7

A new milestone release for Scala is available. This release is cut directly from current development and is not intended for production environments, but is a great chance to try out the up and coming features for Scala 2.10.0. The milestone 2.10.0-M7 includes many fixes and improvements, listed below.

New in this milestone:

• Performance Improvements
• Macros:
  • c.reify removed, use c.universe.reify instead
  • scala.reflect.makro renamed to scala.reflect.macros
  • Usages of macros no longer require scala-reflect.jar on library classpath
  • Macros now only allow c.AbsTypeTag context bounds (details). Use c.AbsTypeTag instead of c.TypeTag, implicitly[c.AbsTypeTag[T]].tpe instead of c.typeOf[T] (in RC1 there will be a shortcut, c.absTypeOf[T])
  • Breakage!! Macro impls for macro defs with implicit parameters cannot have type tag context bounds: https://issues.scala-lang.org/browse/SI-6281. Fixed in RC1, see the linked issue for a workaround.

• Reflection:
  • Introduced MethodSymbol.{params, typeParams, returnType}
  • asXXXSymbol renamed to asXXX, asType renamed to Type, asTypeConstructor renamed to toTypeConstructor
  • Introduced TermSymbol.{getter, setter, accessed} to navigate between accessor symbols and underlying field symbols
  • Flags on symbols are gone and replaced with a lot of new isXXX tests
  • Some isXXX tests on symbols moved from Symbol to descendants
  • Breakage!! isXXX tests don’t work unless a symbol is initialized: https://issues.scala-lang.org/browse/SI-6277. Will be fixed in RC1, see the linked issue for a workaround.
  • Some methods on types are gone and should be replaced by pattern matching (e.g. Type.typeParams is removed and is supposed to be acquired by matching against PolyType)
  • TermSymbol.resolveOverloaded is removed and is planned to be resurrected in 2.10.1
  • base.StandardNames and api.StandardNames have undergone a drastic cleanup
  • Implementation of mirrors is now complete: ModuleMirror.instance works for nested modules, MethodMirror.apply support magic symbols, mirrors correctly work with value classes, etc
  • See this thread for some info about migration: http://groups.google.com/group/scala-internals/browse_thread/thread/4758995dfa2da9db  

• ClassTag.Nothing now throws an exception to emphasize the fact that there are no values of type Nothing. On a second thought, this is deemed to be a mistake and is reverted in RC1.

Here's a list of isssues that have been fixed since v2.10.0-M6

Special thanks to all the contribtuors!

Community Projects

Special thanks to the 22 projects that have made releases available for this version of Scala!

• scala-arm
  Scala-arm provides automated resource management to ensure all your resources are closed without all the extra work!
  Location: "org.scala-lang" % "scala-arm_2.10.0-M7" % "1.2"
   
• scalaz
  Scalaz: Type Classes and Pure Functional Data Structures for Scala
  Location: "org.scalaz" % "scalaz-core_2.10.0-M7" % "6.0.3" "org.scalaz" % "scalaz-core_2.10.0-M7" % "6.0.4" "org.scalaz" % "scalaz-core_2.10.0-M7" % "7.0.0-M3"
   
• ScalaInterpreterPane
  A Swing based front-end for the Scala REPL (interpreter)
  Location: "de.sciss" %% "scalainterpreterpane" % "1.1.+"
   
• AudioWidgets
  Specialized Swing widgets for audio applications in Scala
  Location: "de.sciss" %% "audiowidgets" % "1.0.+"
   
• ScalaAudioWidgets
  Scala-Swing wrappers for the AudioWidgets library
  Location: "de.sciss" %% "scalaaudiowidgets" % "1.0.+"
   
• ScalaAudioFile
  A library to read and write uncompressed audio files (AIFF, WAVE, etc.)
  Location: "de.sciss" %% "scalaaudiofile" % "1.0.+"
   
• ScalaOSC
  A library for OpenSoundControl (OSC), a message protocol used in multi-media applications.
  Location: "de.sciss" %% "scalaosc" % "1.0.+"
   
• ScalaCollider
  A sound synthesis library for the SuperCollider server
  Location: "de.sciss" %% "scalacollider" % "1.0.+"
   
• ScalaColliderSwing
  A Swing and REPL front-end for ScalaCollider
  Location: "de.sciss" %% "scalacolliderswing" % "1.0.+"
   
• Scala-IO Core
  Library for idiomatic IO in Scala
  Location: "com.github.scala-incubator.io" % "scala-io-core_2.10" % "0.4.1"
   
• Scala-IO File
  Library for idiomatic Filesystem access in Scala
  Location: "com.github.scala-incubator.io" % "scala-io-file_2.10" % "0.4.1"
   
• specs2
  specs2 is a library for executable specifications in Scala
  Location: "org.specs2" % "specs2_2.10.0-M7" % "1.12.1"
   
• ScalaTest
  ScalaTest - simple, clear tests and executable specifications
  Location: "org.scalatest" % "scalatest_2.10.0-M7" % "1.9-2.10.0-M7-B1"
   
• Scales Xml
  Scales Xml provides superb performance with low memory usage, a unified pull and push model, Iteratee and Iterator based pull parsing, equality framework, both an embedded XPath DSL and string based XPath 1.0 support.
  Location: "org.scalesxml" % "scales-xml_2.10.0-M7" % "0.3.0"
   
• parboiled
  Elegant parsing in Java and Scala - lightweight, easy-to-use, powerful.
  Location: "org.parboiled" % "parboiled-scala" % "1.1" Repository: http://repo.spray.cc
   
• scalalogging
  Convenient and performant logging in Scala
  Location: "com.typesafe" %% "scalalogging-slf4j" % "0.3.0-SNAPSHOT" cross CrossVersion.full
   
• scala-stm
  Software transactional memory for Scala
  Location: resolvers += ("releases" at "http://oss.sonatype.org/content/repositories/releases") libraryDependencies += ("org.scala-tools" %% "scala-stm" % "0.6")
   
• Akka
  Akka is a platform for building highly concurrent, distributed, and fault tolerant event-driven applications on the JVM.
  Location: Repository: http://repo.akka.io/releases/ "com.typesafe.akka" % "akka-actor_2.10.0-M7" % "2.1-M2" Docs: http://doc.akka.io/docs/akka/2.1-M1/ ScalaDoc: http://doc.akka.io/api/akka/2.1-M1/#package Full distribution: http://akka.io/downloads/
   
• kiama
  Kiama is a language processing library
  Location: "com.googlecode.kiama" % "kiama_2.10.0-M7" % "1.4.0-B1""
   

Complete commit list!