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class A { class func foo(x: A) { print(x) } } class B: A { override class func foo(x: A?) { print(x) } } こいつは通るのに
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class A { class func foo(x: A) { print(x) } } class B: A { override class func foo(x: B) { print(x) } } こいつダメなの最高に納得がいかないw