messing with implicit lookup

gistfile1.txt

package foo {
  class Bar

  object Bar {
    implicit val b = new Bar
  }

}

import foo.Bar

class Vector(implicit bar: Bar)

trait Lookup[T]

object Vector extends Lookup[Bar] {
}

class Matrix(implicit bar: Bar)

object Matrix extends Lookup[Bar] {
}

object Main {

  def foo(a: Vector, b: Matrix)(implicit bar: Bar) = ???

  foo(new Vector, new Matrix)
}