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object Test extends App {
def fold[A, B](f: (A, => B) => B) = (b: B) => f(null.asInstanceOf[A], b)
def f[A, B](x: A, y: B): B = y
def bip[A, B] = fold[A, B]((x, y) => f(x, y))
def bop[A, B] = fold[A, B](f(_, _))
// these work:
fold[Int, Int]((x, y) => f(x, y))(0)
fold[Int, Int](f(_, _))(0)
// Used to throw a ClassCastException. Since the fix for SI-7899, these issue type errors.
// fold[Int, Int](f _)(0)
// fold[Int, Int](f)(0)
}
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