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// CS0183: The given expression is always of the provided (`U') type
// Line: 14
// Compiler options: -warnaserror
abstract class A<T>
{
public abstract bool Foo<U> (U arg) where U : T;
}
class B : A<int>
{
public override bool Foo<U> (U arg)
{
return arg is U;
}
}
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