// a.scala
package object pkg {
  class AnyOps(val x: Any) extends AnyVal { def to_s: String = "" + x }
  implicit def mkAnyOps(x: Any): AnyOps = new AnyOps(x)
}
package pkg {
  package object other { }
  package other { class Crash { def f() = List(1) map (_.to_s) } }
}

% scalac3 a.scala && scalac3 a.scala
error: EmptyScope.enter
error: scala.reflect.internal.FatalError:
  EmptyScope.enter
     while compiling: a.scala
        during phase: extmethods
     library version: version 2.11.0-20140109-065029-992050a619
    compiler version: version 2.11.0-20140109-065029-992050a619
  reconstructed args:

  last tree to typer: Ident(x)
       tree position: line 2 of a.scala
            tree tpe: Boolean
              symbol: value x
   symbol definition: x: Boolean (a TermSymbol)
      symbol package: <none>
       symbol owners: value x
           call site: constructor AnyOps in class AnyOps in package pkg

== Source file context for tree position ==

     0 package object pkg {
     1   class AnyOps(val x: Any) extends AnyVal { def to_s: String = "" + x }
     2   implicit def mkAnyOps(x: Any): AnyOps = new AnyOps(x)
     3 }
     4 package pkg {
     5   package object other { }
     6   package other { class Crash { def f() = List(1) map (_.to_s) } }
	at scala.reflect.internal.SymbolTable.abort(SymbolTable.scala:56)
	at scala.tools.nsc.Global.abort(Global.scala:263)
	at scala.reflect.internal.Scopes$EmptyScope$.enterEntry(Scopes.scala:460)
	at scala.reflect.internal.Scopes$Scope.enter(Scopes.scala:131)
	at scala.tools.nsc.transform.ExtensionMethods$Extender.makeExtensionMethodSymbol$1(ExtensionMethods.scala:215)
	at scala.tools.nsc.transform.ExtensionMethods$Extender.transform(ExtensionMethods.scala:218)
	at scala.tools.nsc.transform.ExtensionMethods$Extender.transform(ExtensionMethods.scala:125)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:2666)
	at scala.reflect.api.Trees$Transformer$$anonfun$transformStats$1.apply(Trees.scala:2664)