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// CS0311: The type `B' cannot be used as type parameter `T' in the generic type or method `Foo<T>'. There is no implicit reference conversion from `B' to `A'
// Line: 19
public class Foo<T>
where T : A
{
}
public class A
{
}
public class B
{
}
class X
{
Foo<B> foo;
static void Main ()
{
}
}