Error "reference to <method> is ambiguous", importing methods with the same name from different scopes

[scabug]

I have the following code:

class Vector (val x: Double, val y: Double, val z: Double) {
  def *(f: Double) = new Vector(x * f, y * f, z * f)
  def +(v: Vector) = new Vector(x + v.x, y + v.y, z + v.z)
}

object Scope1 {
  def interpolate(t: Double, a: Double, b: Double): Double = a * (1.0 - t) + b * t
}

object Scope2 {
  def interpolate(t: Double, a: Vector, b: Vector): Vector = a * (1.0 - t) + b * t
}

class Example {
  import Scope1._
  import Scope2._

  def main(args: Array[String]) {
    val v = interpolate(0.3, 2.5, 4.5)
  }
}

When I compile this with Scala 2.8.0.RC6, I get an unexpected error message:

Example.scala:21: error: reference to interpolate is ambiguous;
it is imported twice in the same scope by
import Scope2._
and import Scope1._
val v = interpolate(0.3, 2.5, 4.5)
^
one error found

Why does the compiler think the reference is ambiguous? The two interpolate methods have different signatures and it should be clear which one I want to apply. Note that if I put them both in class Example, without importing them, it works without a problem:

// No problem
class Example {
  def interpolate(t: Double, a: Double, b: Double): Double = a * (1.0 - t) + b * t
  def interpolate(t: Double, a: Vector, b: Vector): Vector = a * (1.0 - t) + b * t

  def main(args: Array[String]) {
    val v = interpolate(0.3, 2.5, 4.5)
  }
}

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-3635?orig=1
Reporter: Jesper (jesper)

[scabug]

@paulp said:
Duplicate of wontfix #2551.