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The important sentence in the first quote is In case of overriding, if a method with the same name is declared in the superclass then it must have the same type. So if you have class C1 { ... } class C2 { ... } class Cls { C1 foo(C2 x) { ... } } override(foo, Cls, (C2)->C1) holds but override(foo, Cls, (C2)->C2) doesn't; the subclass class ...


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