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  trait CanWhere[A] {
    def apply(f: PartialFunction[A, A]): Selector[Node]
  }
  
  implicit val stringToCanWhere = new CanWhere[String] {
    def apply(f: PartialFunction[String, String]) =
      Selector({ case Elem(p, name, a, s, c) if f.isDefinedAt(name) => Elem(p, f(name), a, s, c) })
  }
  
  implicit val nodeToCanWhere = new CanWhere[Node] {

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trait CanReadXML[A] {
  def reads(seq: scala.xml.NodeSeq): Either[String, A]
}

trait Foo { def foo: Int }
trait Bar { def bar: Int }

object Def {
  def fromXML[A: CanReadXML](seq: scala.xml.NodeSeq) =
    implicitly[CanReadXML[A]].reads(seq)

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<?xml version='1.0' encoding='UTF-8' ?>

<!-- Schema for the SOAP/1.1 encoding

Portions © 2001 DevelopMentor. 
© 2001 W3C (Massachusetts Institute of Technology, Institut National de Recherche en Informatique et en Automatique, Keio University). All Rights Reserved.  
 
This document is governed by the W3C Software License [1] as described in the FAQ [2].
[1] http://www.w3.org/Consortium/Legal/copyright-software-19980720
[2] http://www.w3.org/Consortium/Legal/IPR-FAQ-20000620.html#DTD 

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test in Assembly := {}

jarName in PluginA := "foo.jar"

jarName in PluginB := "bar.jar"

Assembly.test := {} // equivalent of test in Assembly := {}

PluginA.jarName := "foo.jar" // equivalent of jarName in PluginA := "foo.jar"

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[helloworld]$ sbt
[info] Loading project definition from /Users/eed3si9n/work/helloworld/project
[info] Updating {file:/Users/eed3si9n/work/helloworld/project/}default-0a9cf4...
[info] Done updating.
[error] java.lang.NoClassDefFoundError: scalaxb/compiler/Config
[error] Use 'last' for the full log.
Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore? l
[info] Loading project definition from /Users/eed3si9n/work/helloworld/project
[info] Updating {file:/Users/eed3si9n/work/helloworld/project/}default-0a9cf4...
[debug] Other repositories:

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object FooPlugin extends sbt.Plugin {
  val FooConfig = config("foo")
  lazy val fooA    = SettingKey[Int]("foo-a")
  lazy val fooB    = SettingKey[String]("foo-b")
  lazy val fooC    = SettingKey[(Int, String)]("foo-c")
  lazy val fooD    = SettingKey[(Int, String, String)]("foo-d")
  
  lazy val fooJars = TaskKey[Classpath]("foo-jars")
  lazy val fooSomething = TaskKey[Classpath]("foo-something")
  

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// Generated by <a href="http://scalaxb.org/">scalaxb</a>.
package general


case class SingularBuiltInTypeTest(singularbuiltintypetestsequence1: general.SingularBuiltInTypeTestSequence1,
  singularbuiltintypetestsequence2: general.SingularBuiltInTypeTestSequence2,
  singularbuiltintypetestsequence3: general.SingularBuiltInTypeTestSequence3,
  singularbuiltintypetestsequence4: general.SingularBuiltInTypeTestSequence4,
  singularbuiltintypetestsequence5: general.SingularBuiltInTypeTestSequence5) {
  lazy val string = singularbuiltintypetestsequence1.string

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giter8-plugin> compile
[info] Compiling 2 Scala sources to /Users/eed3si9n/work/giter8/plugin/target/scala-2.9.1/sbt-0.11.0/classes...
[error] /Users/eed3si9n/work/giter8/plugin/src/main/scala/giterate-plugin.scala:8: not found: value ScriptedPlugin
[error]   import ScriptedPlugin._
[error]          ^
[error] one error found
[error] {file:/Users/eed3si9n/work/giter8/}giter8-plugin/compile:compile: Compilation failed
[error] Total time: 1 s, completed Oct 15, 2011 4:33:52 PM

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    // tasks
    scalaxbConfig in scalaxb <<= new Scoped.RichTaskableKeys((combinedPackageNames in scalaxb) :^:
        (packageDir in scalaxb) :^:
        (classPrefix in scalaxb) :^:
        (paramPrefix in scalaxb) :^:
        (wrapContents in scalaxb) :^:
        (generateRuntime in scalaxb) :^:
        (chunkSize in scalaxb) :^:
        (protocolFileName in scalaxb) :^:
        (protocolPackageName in scalaxb) :^:

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Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore? last
[info] Loading project definition from /Users/eed3si9n/work/sbt-assembly/project
[debug] Running task... Cancelable: false, max worker threads: 8, check cycles: false
[info] Updating {file:/Users/eed3si9n/work/sbt-assembly/project/}default-635ec9...
[debug] Other repositories:
[debug] Default repositories:
[debug] 	URLRepository(typesafe-ivy-releases,sbt.Patterns@7291b9b0)
[debug] 	Raw(ProjectResolver(inter-project, mapped: ))
[debug] 	FileRepository(local,FileConfiguration(true,None),sbt.Patterns@40d1e07c)
[debug] 	public: http://repo1.maven.org/maven2/