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import scala.{collection => sc}
object Test {
trait Foo[T]
// Haven't managed to repro without using a CanBuild or CanBuildFrom implicit parameter
implicit def MapFoo[A, B, M[A, B] <: sc.Map[A,B]](implicit aFoo: Foo[A], bFoo: Foo[B], cb: sc.generic.CanBuild[(A, B), M[A, B]]) = new Foo[M[A,B]] {}
implicit object Tuple2IntIntFoo extends Foo[(Int, Int)] // no difference if this line is uncommented
implicit def Tuple2Foo[A, B] = new Foo[(A, B)] {} // nor this one
implicitly[Foo[(Int, Int)]]
}
class A {
def x[N[X] >: M[X], M[_], G](n: N[G], m: M[G]) = null
x(Some(3), Seq(2))
}
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