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class Observable1[+T](val asJava: JObservable[_ <: T]) extends AnyVal {
private def foo[X](a: JObservable[X]): JObservable[X] = ???
// was generating a type error as the type of the RHS included an existential
// skolem based on the class type parameter `T`, which did not conform
// to the typer parameter of the extension method into which the RHS is
// transplanted.
def synchronize: Observable1[T] = new Observable1(foo(asJava))
}
class JObservable[T]
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