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trait Param[T]
trait Abs { type T }
trait Cyclic1[A <: Param[A]] // works
trait Cyclic2[A <: Abs { type T <: A }]
trait Cyclic3 { type A <: Abs { type T = A } }
trait Cyclic4 { type A <: Param[A] } // works
trait Cyclic5 { type AA <: Abs; type A <: AA { type T = A } }
trait IterableTemplate {
type Elem
type Constr <: IterableTemplate
type ConstrOf[A] = Constr { type Elem = A }
def iterator: Iterator[Elem]
def map [B] (f: Elem => B): ConstrOf[B]
def foreach(f: Elem => Unit) = iterator.foreach(f)
}
trait Iterable[A] extends IterableTemplate { self =>
type Elem
type Constr <: Iterable[A] { type Constr <: Iterable.this.Constr }
}
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