seraphrの日記

抽象型について考えてみる2

scala

昨日（id:seraphr:20110901）の続き

@seraphr 抽象型 + 自分型注釈 の実装(私)と Genericsによる実装を比べてみるとわかると思うんですが、Genericsによる実装は「重複コード」が多いわけです。 #scalajp

2011-09-01 21:50:24 via Tween to @seraphr

@seraphr つまり、Genericsによる拡張可能なVisitorパターンはうまくモジュール化されていないといえるかと。 #scalajp

2011-09-01 22:49:50 via Tween to @seraphr

@kmizu そうして考えると、Genericsと抽象型は影響範囲が違うんですね。 Genericsは型と共に宣言されるのでその型の内部にしか影響を与えられないけど、抽象型はメンバーとして宣言されるので他のメンバーにも影響を与えられる。 *Tw*

2011-09-02 00:39:37 via Twit for Windows to @kmizu

@kmizu 逆に、Generics型の内部クラスを参照できないかとclass VisitorsBaseGenerics[V <: VisitorsBaseGenerics[V]#Visitor]とか書いてみましたけどvisitメソッドの引数の型が合わないと怒られますね *Tw*

2011-09-02 00:39:55 via Twit for Windows to @kmizu

ってことで、抽象型は『コードの再利用』とはちょっと違う感じだけど、DRY原則的に重要になってくる概念ってことなのかな。

確かに、実際自己言及するジェネリックスを大量に使ってグループ化したクラス群を定義したライブラリとか、書いたことあるけど、下手に型引数の数とかが変わると変更が波及したりして色々大変だし、その点でも色々嬉しそう。

んで↑のツイートでも言っているけれども、Genericsクラスの内部クラスを参照して、Genericsを定義すれば、同じ効果が得られるんじゃないか、と思って書いたのが以下のコード。 ↑のツイートしてから、もうちょっと頑張ってみたんだけど、なんかコンパイラから『error: java.lang.AssertionError: assertion failed: VisitorsPlusGenerics[V]』って怒られてコンパイルが通らなくなっちゃった。

文法的に通らないとか、型が解決できないとかならわかるんだけど、assertion failedって何が原因なんだろう…

trait VisitorsBaseGenerics[V <: VisitorsBaseGenerics[V]#Visitor] { self =>
  trait Node {
    def accept(v: V)
  }
  case class Add(l: Node, r: Node) extends Node {
    def accept(v: V) {
      v.visit(this)
    }
  }
  case class Sub(l: Node, r: Node) extends Node {
    def accept(v: V) {
      v.visit(this)
    }
  }
  case class Value(value: Int) extends Node {
    def accept(v: V) {
      v.visit(this)
    }
  }
  trait Visitor { self: V =>
    def visit(node: VisitorsBaseGenerics[V]#Add) {
      println("Add!")
      node.l.accept(this)
      node.r.accept(this)
    }
    def visit(node: VisitorsBaseGenerics[V]#Sub) {
      println("Sub!")
      node.l.accept(this)
      node.r.accept(this)
    }
    def visit(node: VisitorsBaseGenerics[V]#Value) {
      println("Value: " + node.value)
    }
  }
}

class VisitorsPlusGenerics[V <: VisitorsPlusGenerics[V]#Visitor] extends VisitorsBaseGenerics[V] {
  case class Mul(l: Node, r: Node) extends Node {
    def accept(v: V) {
      v.visit(this)
    }
  }
  case class Div(l: Node, r: Node) extends Node {
    def accept(v: V) {
      v.visit(this)
    }
  }
  class Visitor extends super.Visitor { self: V =>
    def visit(node: VisitorsPlusGenerics[V]#Mul) {
      println("Mul")
      node.l.accept(this)
      node.r.accept(this)
    }
    def visit(node: VisitorsPlusGenerics[V]#Div) {
      println("Div")
      node.l.accept(this)
      node.r.accept(this)
    }
  }
}

object VisitorGenericsMain {
  val mVisitorContainer = new VisitorsPlusGenerics[UseVisitor]
  import mVisitorContainer._

  class UseVisitor extends Visitor
  def main(args: Array[String]) {
    val v = new UseVisitor
    Add(Value(1), Value(2)).accept(v)
    Sub(Value(1), Value(2)).accept(v)
    Mul(Value(1), Value(2)).accept(v)
    Div(Value(1), Value(2)).accept(v)
  }
}

以下が発生するエラー

>scalac VisitorGenericsMain.scala
error: java.lang.AssertionError: assertion failed: jp.seraphr.scala.hello.HelloScala.generics.VisitorsPlusGenerics[V]
        at scala.Predef$.assert(Predef.scala:103)
        at scala.tools.nsc.ast.TreeGen.mkAttributedQualifier(TreeGen.scala:66)
        at scala.tools.nsc.ast.TreeGen.mkAttributedQualifier(TreeGen.scala:44)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.mixinOuterAccessorDef(ExplicitOuter.scala:351)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer$$anonfun$transform$1$$anonfun$apply$mcV$sp$1.apply(ExplicitOuter.scala:457)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer$$anonfun$transform$1$$anonfun$apply$mcV$sp$1.apply(ExplicitOuter.scala:455)
        at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
        at scala.collection.immutable.List.foreach(List.scala:45)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer$$anonfun$transform$1.apply$mcV$sp(ExplicitOuter.scala:455)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer$$anonfun$transform$1.apply(ExplicitOuter.scala:448)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer$$anonfun$transform$1.apply(ExplicitOuter.scala:448)
        at scala.tools.nsc.ast.Trees$Transformer.atOwner(Trees.scala:899)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:38)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.transform(ExplicitOuter.scala:447)
        at scala.tools.nsc.ast.Trees$Transformer.transformTemplate(Trees.scala:875)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transform$2.apply(Trees.scala:767)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transform$2.apply(Trees.scala:766)
        at scala.tools.nsc.ast.Trees$Transformer.atOwner(Trees.scala:899)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:38)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:31)
        at scala.tools.nsc.ast.Trees$Transformer.transform(Trees.scala:765)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.transform(TypingTransformers.scala:53)
        at scala.tools.nsc.transform.ExplicitOuter$OuterPathTransformer.transform(ExplicitOuter.scala:257)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.transform(ExplicitOuter.scala:521)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:891)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:889)
        at scala.collection.immutable.List.loop$1(List.scala:117)
        at scala.collection.immutable.List.mapConserve(List.scala:133)
        at scala.tools.nsc.ast.Trees$Transformer.transformStats(Trees.scala:889)
        at scala.tools.nsc.ast.Trees$Transformer.transform(Trees.scala:797)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.scala$tools$nsc$transform$TypingTransformers$TypingTransformer$$super$transform(TypingTransformers.scala:49)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer$$anonfun$transform$1.apply(TypingTransformers.scala:49)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer$$anonfun$transform$1.apply(TypingTransformers.scala:49)
        at scala.tools.nsc.ast.Trees$Transformer.atOwner(Trees.scala:899)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:38)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:31)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.transform(TypingTransformers.scala:49)
        at scala.tools.nsc.transform.ExplicitOuter$OuterPathTransformer.transform(ExplicitOuter.scala:257)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.transform(ExplicitOuter.scala:460)
        at scala.tools.nsc.ast.Trees$Transformer.transformTemplate(Trees.scala:875)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transform$2.apply(Trees.scala:767)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transform$2.apply(Trees.scala:766)
        at scala.tools.nsc.ast.Trees$Transformer.atOwner(Trees.scala:899)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:38)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:31)
        at scala.tools.nsc.ast.Trees$Transformer.transform(Trees.scala:765)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.transform(TypingTransformers.scala:53)
        at scala.tools.nsc.transform.ExplicitOuter$OuterPathTransformer.transform(ExplicitOuter.scala:257)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.transform(ExplicitOuter.scala:521)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:891)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:889)
        at scala.collection.immutable.List.loop$1(List.scala:117)
        at scala.collection.immutable.List.mapConserve(List.scala:133)
        at scala.tools.nsc.ast.Trees$Transformer.transformStats(Trees.scala:889)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transform$1.apply(Trees.scala:761)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transform$1.apply(Trees.scala:761)
        at scala.tools.nsc.ast.Trees$Transformer.atOwner(Trees.scala:899)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:38)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:31)
        at scala.tools.nsc.ast.Trees$Transformer.transform(Trees.scala:760)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.scala$tools$nsc$transform$TypingTransformers$TypingTransformer$$super$transform(TypingTransformers.scala:49)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer$$anonfun$transform$2.apply(TypingTransformers.scala:51)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer$$anonfun$transform$2.apply(TypingTransformers.scala:51)
        at scala.tools.nsc.ast.Trees$Transformer.atOwner(Trees.scala:899)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:38)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:31)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.transform(TypingTransformers.scala:51)
        at scala.tools.nsc.transform.ExplicitOuter$OuterPathTransformer.transform(ExplicitOuter.scala:257)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.transform(ExplicitOuter.scala:521)
        at scala.tools.nsc.ast.Trees$Transformer.transformUnit(Trees.scala:892)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.scala$tools$nsc$transform$ExplicitOuter$ExplicitOuterTransformer$$super$transformUnit(ExplicitOuter.scala:529)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer$$anonfun$transformUnit$1.apply(ExplicitOuter.scala:529)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer$$anonfun$transformUnit$1.apply(ExplicitOuter.scala:529)
        at scala.tools.nsc.symtab.SymbolTable.atPhase(SymbolTable.scala:96)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.transformUnit(ExplicitOuter.scala:529)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.transformUnit(ExplicitOuter.scala:318)
        at scala.tools.nsc.transform.Transform$Phase.apply(Transform.scala:30)
        at scala.tools.nsc.Global$GlobalPhase$$anonfun$applyPhase$1.apply(Global.scala:326)
        at scala.tools.nsc.Global$GlobalPhase$$anonfun$applyPhase$1.apply(Global.scala:326)
        at scala.tools.nsc.reporters.Reporter.withSource(Reporter.scala:47)
        at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:326)
        at scala.tools.nsc.Global$GlobalPhase$$anonfun$run$1.apply(Global.scala:294)
        at scala.tools.nsc.Global$GlobalPhase$$anonfun$run$1.apply(Global.scala:294)
        at scala.collection.Iterator$class.foreach(Iterator.scala:652)
        at scala.collection.mutable.ListBuffer$$anon$1.foreach(ListBuffer.scala:311)
        at scala.tools.nsc.Global$GlobalPhase.run(Global.scala:294)
        at scala.tools.nsc.transform.ExplicitOuter$Phase.run(ExplicitOuter.scala:539)
        at scala.tools.nsc.Global$Run.compileSources(Global.scala:949)
        at scala.tools.nsc.Global$Run.compile(Global.scala:1034)
        at scala.tools.nsc.Main$.process(Main.scala:106)
        at scala.tools.nsc.Main$.main(Main.scala:123)
        at scala.tools.nsc.Main.main(Main.scala)

Exception in thread "main" java.lang.AssertionError: assertion failed: jp.seraphr.scala.hello.HelloScala.generics.VisitorsPlusGenerics[V]
        at scala.Predef$.assert(Predef.scala:103)
        at scala.tools.nsc.ast.TreeGen.mkAttributedQualifier(TreeGen.scala:66)
        at scala.tools.nsc.ast.TreeGen.mkAttributedQualifier(TreeGen.scala:44)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.mixinOuterAccessorDef(ExplicitOuter.scala:351)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer$$anonfun$transform$1$$anonfun$apply$mcV$sp$1.apply(ExplicitOuter.scala:457)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer$$anonfun$transform$1$$anonfun$apply$mcV$sp$1.apply(ExplicitOuter.scala:455)
        at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
        at scala.collection.immutable.List.foreach(List.scala:45)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer$$anonfun$transform$1.apply$mcV$sp(ExplicitOuter.scala:455)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer$$anonfun$transform$1.apply(ExplicitOuter.scala:448)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer$$anonfun$transform$1.apply(ExplicitOuter.scala:448)
        at scala.tools.nsc.ast.Trees$Transformer.atOwner(Trees.scala:899)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:38)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.transform(ExplicitOuter.scala:447)
        at scala.tools.nsc.ast.Trees$Transformer.transformTemplate(Trees.scala:875)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transform$2.apply(Trees.scala:767)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transform$2.apply(Trees.scala:766)
        at scala.tools.nsc.ast.Trees$Transformer.atOwner(Trees.scala:899)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:38)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:31)
        at scala.tools.nsc.ast.Trees$Transformer.transform(Trees.scala:765)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.transform(TypingTransformers.scala:53)
        at scala.tools.nsc.transform.ExplicitOuter$OuterPathTransformer.transform(ExplicitOuter.scala:257)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.transform(ExplicitOuter.scala:521)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:891)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:889)
        at scala.collection.immutable.List.loop$1(List.scala:117)
        at scala.collection.immutable.List.mapConserve(List.scala:133)
        at scala.tools.nsc.ast.Trees$Transformer.transformStats(Trees.scala:889)
        at scala.tools.nsc.ast.Trees$Transformer.transform(Trees.scala:797)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.scala$tools$nsc$transform$TypingTransformers$TypingTransformer$$super$transform(TypingTransformers.scala:49)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer$$anonfun$transform$1.apply(TypingTransformers.scala:49)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer$$anonfun$transform$1.apply(TypingTransformers.scala:49)
        at scala.tools.nsc.ast.Trees$Transformer.atOwner(Trees.scala:899)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:38)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:31)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.transform(TypingTransformers.scala:49)
        at scala.tools.nsc.transform.ExplicitOuter$OuterPathTransformer.transform(ExplicitOuter.scala:257)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.transform(ExplicitOuter.scala:460)
        at scala.tools.nsc.ast.Trees$Transformer.transformTemplate(Trees.scala:875)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transform$2.apply(Trees.scala:767)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transform$2.apply(Trees.scala:766)
        at scala.tools.nsc.ast.Trees$Transformer.atOwner(Trees.scala:899)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:38)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:31)
        at scala.tools.nsc.ast.Trees$Transformer.transform(Trees.scala:765)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.transform(TypingTransformers.scala:53)
        at scala.tools.nsc.transform.ExplicitOuter$OuterPathTransformer.transform(ExplicitOuter.scala:257)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.transform(ExplicitOuter.scala:521)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:891)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:889)
        at scala.collection.immutable.List.loop$1(List.scala:117)
        at scala.collection.immutable.List.mapConserve(List.scala:133)
        at scala.tools.nsc.ast.Trees$Transformer.transformStats(Trees.scala:889)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transform$1.apply(Trees.scala:761)
        at scala.tools.nsc.ast.Trees$Transformer$$anonfun$transform$1.apply(Trees.scala:761)
        at scala.tools.nsc.ast.Trees$Transformer.atOwner(Trees.scala:899)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:38)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:31)
        at scala.tools.nsc.ast.Trees$Transformer.transform(Trees.scala:760)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.scala$tools$nsc$transform$TypingTransformers$TypingTransformer$$super$transform(TypingTransformers.scala:49)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer$$anonfun$transform$2.apply(TypingTransformers.scala:51)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer$$anonfun$transform$2.apply(TypingTransformers.scala:51)
        at scala.tools.nsc.ast.Trees$Transformer.atOwner(Trees.scala:899)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:38)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:31)
        at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.transform(TypingTransformers.scala:51)
        at scala.tools.nsc.transform.ExplicitOuter$OuterPathTransformer.transform(ExplicitOuter.scala:257)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.transform(ExplicitOuter.scala:521)
        at scala.tools.nsc.ast.Trees$Transformer.transformUnit(Trees.scala:892)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.scala$tools$nsc$transform$ExplicitOuter$ExplicitOuterTransformer$$super$transformUnit(ExplicitOuter.scala:529)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer$$anonfun$transformUnit$1.apply(ExplicitOuter.scala:529)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer$$anonfun$transformUnit$1.apply(ExplicitOuter.scala:529)
        at scala.tools.nsc.symtab.SymbolTable.atPhase(SymbolTable.scala:96)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.transformUnit(ExplicitOuter.scala:529)
        at scala.tools.nsc.transform.ExplicitOuter$ExplicitOuterTransformer.transformUnit(ExplicitOuter.scala:318)
        at scala.tools.nsc.transform.Transform$Phase.apply(Transform.scala:30)
        at scala.tools.nsc.Global$GlobalPhase$$anonfun$applyPhase$1.apply(Global.scala:326)
        at scala.tools.nsc.Global$GlobalPhase$$anonfun$applyPhase$1.apply(Global.scala:326)
        at scala.tools.nsc.reporters.Reporter.withSource(Reporter.scala:47)
        at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:326)
        at scala.tools.nsc.Global$GlobalPhase$$anonfun$run$1.apply(Global.scala:294)
        at scala.tools.nsc.Global$GlobalPhase$$anonfun$run$1.apply(Global.scala:294)
        at scala.collection.Iterator$class.foreach(Iterator.scala:652)
        at scala.collection.mutable.ListBuffer$$anon$1.foreach(ListBuffer.scala:311)
        at scala.tools.nsc.Global$GlobalPhase.run(Global.scala:294)
        at scala.tools.nsc.transform.ExplicitOuter$Phase.run(ExplicitOuter.scala:539)
        at scala.tools.nsc.Global$Run.compileSources(Global.scala:949)
        at scala.tools.nsc.Global$Run.compile(Global.scala:1034)
        at scala.tools.nsc.Main$.process(Main.scala:106)
        at scala.tools.nsc.Main$.main(Main.scala:123)
        at scala.tools.nsc.Main.main(Main.scala)

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