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import scala.language.{ higherKinds }
trait Monad[M[_]] {
def foo[A](a: M[A]): M[A]
}
class Bar[A, B]
class Bar1[A] { type And[B] = Bar[A, B] }
object Test {
// the combination of partial applications and anonymous class is essential to reproduce the bug
// problem: missing bridge method
// --> abstractmethoderror `Main$$anon$1.foo(Ljava/lang/Object;)Ljava/lang/Object;`
// the anonymous class only gets `public Bar foo(Bar a)`
def BarMonad[X] = new Monad[Bar1[X]#And] {
def foo[A](a: Bar[X, A]) = a
}
def main(as: Array[String]) { BarMonad[Int] foo (new Bar[Int, Int]) }
}
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