I defined an extension method on a context function in Scala 3:

object Scope {
  extension [E, A](a: List[E] ?=> A) def extFoo: A = foo(a)
  
  private def foo[E, A](a: List[E] ?=> A) = {
    given s: List[E] = List.empty
    println(a)
    a
  }
}

However, when I try to use it, the compiler complains. The following @main:

@main def main(): Unit = {
  val i: List[String] ?=> Int = 1
  import Scope.extFoo
  i.extFoo
}

generates this error:

No given instance of type List[String] was found for parameter of (List[String]) ?=> Int
  i.extFoo

Everything works fine if I call the extension method with the alternative syntax, extFoo(i).

Is it the expected behavior?