See below code.
protocol Foo {
func bar()
}
extension Foo {
func bar() {
print("I am bar.")
}
}
class A:Foo {
func output() {
print(type(of:self)) // prints "B".
self.bar() // prints "I am bar."
(self as! B).bar() // prints "I am B."
}
}
class B:A {
func bar() {
print("I am B.")
}
}
let b = B()
b.output()
I thought `self.bar()` would do the same as `(self as! B).bar()`. It
didn't. In my opinion, `type(of:self) is B.type`, so they should be the
same, shouldn't they?
Zhaoxin
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