Missing type apply for scala.Dynamic

``` scala
class Foo extends Dynamic {
  def applyDynamic[T](n: String)(): T = ???
}

new Foo().foo[Int]()
// should become
new Foo().applyDynamic[Int]("foo")()
```

The current behaviour is to convert the call to `applyDynamic("foo")[Int]()` which then fails type checking with an error message that is not useful.
