Don't set NewSlot attribute when base class already implements the interface method and same method exists in derived class

1 files changed, 55 insertions, 0 deletions

diff --git a/mcs/tests/test-826.cs b/mcs/tests/test-826.cs
new file mode 100644
index 00000000000..bda94deda68
--- /dev/null
+++ b/mcs/tests/test-826.cs
@@ -0,0 +1,55 @@
+using System;
+using System.Reflection;
+
+public interface I
+{
+	int Foo ();
+}
+
+public class A : I
+{
+	int I.Foo ()
+	{
+		Console.WriteLine ("a");
+		return 1;
+	}
+}
+
+public class AA : A, I
+{
+	public int Foo ()
+	{
+		Console.WriteLine ("aa");
+		return 2;
+	}
+}
+
+public class B : A
+{
+	public int Foo ()
+	{
+		Console.WriteLine ("b");
+		return 3;
+	}
+}
+
+public class Test
+{
+	public static int Main ()
+	{
+		I i = new AA ();
+		if (i.Foo () != 2)
+			return 1;
+		
+		i = new B ();
+		if (i.Foo () != 1)
+			return 2;
+		
+		var m = typeof (B).GetMethod ("Foo");
+		Console.WriteLine (m.Attributes);
+		if (m.Attributes != (MethodAttributes.Public | MethodAttributes.HideBySig))
+			return 3;
+		
+		return 0;
+	}
+}
\ No newline at end of file