error: error while loading X, class file './package/X.class' has location not matching its contents: contains trait X

[scabug]

package.scala

package urgh {
  trait One extends Base {
    def one = 1
  }

  trait Two extends Base {
    def two = true
  }

  trait Base {
    trait Two[A, B] {
      def three(a: A, b: B): A = a
    }
  }
}

package object urgh extends One with Two

$ scalac package.scala

Woo, compilation succeeded. Time to run my awesome program!

$ scala
Welcome to Scala version 2.10.3 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_45).
Type in expressions to have them evaluated.
Type :help for more information.

scala> import urgh._
error: error while loading Two, class file './urgh/Two.class' has location not matching its contents: contains trait Two

scala>

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-8305?orig=1
Reporter: @puffnfresh
Affected Versions: 2.10.3

[scabug]

@puffnfresh said (edited on Feb 17, 2014 11:27:28 PM UTC):
I should note that the Two which wins is the first one:

$ javap urgh.Two
Compiled from "package.scala"
public interface urgh.Two extends urgh.Base {
  public abstract boolean two();
}

[scabug]

@paulp said:
You can witness the problem (or one of them) a lot more easily like so:

package urgh { trait One }
package object urgh { trait One }

Like the reported example, that compiles from source, then fails if classfiles are present.