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using System;
class R<T, U>
where T : System.IDisposable
where U : T
{
public void M (U u)
{
using (u) {
}
}
}
struct S<T, U>
where T : System.IDisposable
where U : struct, T
{
public void M (U u)
{
using (u) {
}
}
}
class X : IDisposable
{
public void Dispose ()
{
}
public static void Main ()
{
new R<X, X> ().M (new X ());
new S<Y, Y> ().M (new Y ());
}
}
struct Y : IDisposable
{
public void Dispose ()
{
}
}
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