using System;
class A {
}
class B : A {
}
// Here, V must inherit T.
class Gen<T, V> where V : T {
}
class Test {
public static void Main() {
// This declaration is OK because B inherits A.
Gen<A, B> x = new Gen<A, B>();
// This declaration is in error because
// A does not inherit B.
// Gen<B, A> y = new Gen<B, A>();
}
}
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