Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/gtest-513.cs

@@ -0,0 +1,65 @@
+using System;
+
+struct S : IDisposable
+{
+	public static int hit;
+
+	void IDisposable.Dispose ()
+	{
+		hit++;
+	}
+
+	public void Dispose ()
+	{
+		throw new ApplicationException ();
+	}
+}
+
+class C : IDisposable
+{
+
+	void IDisposable.Dispose ()
+	{
+	}
+
+	public void Dispose ()
+	{
+		throw new ApplicationException ();
+	}
+}
+
+class Test
+{
+	public static int Main ()
+	{
+		using (new S? ()) {
+		}
+
+		if (S.hit != 0)
+			return 1;
+
+		using (new C ()) {
+		}
+
+		var s = new S ();
+		using (s) {
+		}
+
+		if (S.hit != 1)
+			return 2;
+
+		GenMethod (s);
+
+		if (S.hit != 2)
+			return 3;
+
+		Console.WriteLine ("ok");
+		return 0;
+	}
+
+	static void GenMethod<T> (T t) where T : IDisposable
+	{
+		using (t) {
+		}
+	}
+}