|
[#591] |
project: compiler |
priority: low |
category: bug |
|---|
|
submitter |
assigned to |
status |
date submitted |
|
Sean |
Martin |
fixed |
2006-05-09 16:29:55.0 |
| subject |
head of empty list when overloading assignment with private var of same name |
| code |
abstract class BaseList {
type Node <: BaseNode;
abstract class BaseNode {
protected def self : Node;
private[BaseList] def self00 = self;
def dirty : Unit = {}
def replaceWith(node : Node) = {}
}
implicit def baseNode2Node(bnode : BaseNode): Node = bnode.self00;
}
trait BaseFlow extends BaseList {
type Node <: BFNode;
type Flow <: FlowBase;
type Output <: OutputBase;
type Input <: InputBase;
abstract class FlowBase {
}
trait OutputBase extends FlowBase {
}
trait InputBase extends FlowBase {
}
trait BFNode extends BaseNode {
private var input : Input = null;
private var output : Output = null;
def input_=(in : Input) = {}
}
}
|
| what happened |
bash-3.00$ ~/runtime-workspace/scala/dists/latest/bin/scalac -sourcepath . test/Test.scala
Exception in thread "main" java.lang.Error: head of empty list
at scala.Predef$.error(Predef.scala:159)
at scala.Nil$.head(List.scala:1084)
at scala.Nil$.head(List.scala:1082)
at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$19.apply(Typers.scala:663)
at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$19.apply(Typers.scala:660)
at scala.tools.nsc.ast.Trees$class.DefDef(Trees.scala:252)
at scala.tools.nsc.Global.DefDef(Global.scala:31)
at scala.tools.nsc.typechecker.Typers$Typer.setterDef$0(Typers.scala:660)
at scala.tools.nsc.typechecker.Typers$Typer.addGetterSetter(Typers.scala:665)
at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$22.apply(Typers.scala:687)
at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$22.apply(Typers.scala:687)
at scala.List.flatMap(List.scala:921)
at scala.tools.nsc.typechecker.Typers$Typer.typedTemplate(Typers.scala:687)
at scala.tools.nsc.typechecker.Typers$Typer.typedClassDef(Typers.scala:625)
at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:1298)
at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:1627)
at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:1653)
at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$45.apply(Typers.scala:973)
at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$45.apply(Typers.scala:963)
at scala.List$.loop$0(List.scala:232)
at scala.List$.mapConserve(List.scala:249)
at scala.List$.loop$0(List.scala:236)
at scala.List$.mapConserve(List.scala:249)
at scala.List$.loop$0(List.scala:236)
at scala.List$.mapConserve(List.scala:249)
at scala.List$.loop$0(List.scala:236)
at scala.List$.mapConserve(List.scala:249)
at scala.List$.loop$0(List.scala:236)
at scala.List$.mapConserve(List.scala:249)
at scala.List$.loop$0(List.scala:236)
at scala.List$.mapConserve(List.scala:249)
at scala.List$.loop$0(List.scala:236)
at scala.List$.mapConserve(List.scala:249)
at scala.List$.loop$0(List.scala:236)
at scala.List$.mapConserve(List.scala:249)
at scala.tools.nsc.typechecker.Typers$Typer.typedStats(Typers.scala:963)
at scala.tools.nsc.typechecker.Typers$Typer.typedTemplate(Typers.scala:687)
at scala.tools.nsc.typechecker.Typers$Typer.typedClassDef(Typers.scala:625)
at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:1298)
at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:1627)
at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:1653)
at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$45.apply(Typers.scala:973)
at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$45.apply(Typers.scala:963)
at scala.List$.loop$0(List.scala:232)
at scala.List$.mapConserve(List.scala:249)
at scala.List$.loop$0(List.scala:236)
at scala.List$.mapConserve(List.scala:249)
at scala.tools.nsc.typechecker.Typers$Typer.typedStats(Typers.scala:963)
at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:1294)
at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:1627)
at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:1653)
at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$1.apply(Analyzer.scala:38)
at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:210)
at scala.tools.nsc.Global$GlobalPhase$$anonfun$1.apply(Global.scala:199)
at scala.tools.nsc.Global$GlobalPhase$$anonfun$1.apply(Global.scala:199)
at scala.Iterator$class.foreach(Iterator.scala:304)
at scala.collection.mutable.ListBuffer$$anon$0.foreach(ListBuffer.scala:216)
at scala.tools.nsc.Global$GlobalPhase.run(Global.scala:199)
at scala.tools.nsc.Global$Run.compileSources(Global.scala:436)
at scala.tools.nsc.Global$Run.compile(Global.scala:494)
at scala.tools.nsc.Main$.process(Main.scala:60)
at scala.tools.nsc.Main$.main(Main.scala:82)
at scala.tools.nsc.Main.main(Main.scala)
|
| what expected |
I think there might be an error in my code, that I shouldn't be defining input_=, but I'm not sure. Anyways, it shouldn't crash :) |
|
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