Scala WTF

gistfile1.scala

case class Person(name: String, age: Int)

object Person

case class OtherPerson(name: String, age: Int)

object T {
  def ap[A, B, C](f: (A, B) => C)(a: A, b: B): C =
    f(a, b)

  // This fails the compiler[1]...
  // val p = ap(Person)("Fred", 20)
  val q = ap(Person(_: String, _: Int))("Fred", 20)

  // ...but this doesn't. Why?
  val op = ap(OtherPerson)("Fred", 20)
}

/*
[1]

error: type mismatch;
 found   : Person.type (with underlying type object Person)
 required: (?, ?) => ?
   val p = ap(Person)("Fred", 20)

*/

https://issues.scala-lang.org/browse/SI-3664