Imported Upstream version 3.12.0

Former-commit-id: cf92446697332992ec36726e78eb8703e1f259d7

mcs/tests/gtest-624.cs

@@ -0,0 +1,36 @@
+using System;
+
+class Model
+{
+	public int Value;
+}
+
+class C1<T1>
+{
+	public void Add (Func<T1, int> t)
+	{
+	}
+}
+
+abstract class C2<TModel>
+{
+	public abstract void ApplyImpl<U> (C1<U> c1) where U : TModel;
+}
+
+class C3 : C2<Model>
+{
+	public override void ApplyImpl<Foo> (C1<Foo> c1)
+	{
+		c1.Add (t => t.Value);
+	}
+}
+
+class Program
+{
+	static void Main ()
+	{
+		var v1 = new C1<Model> ();
+		var c3 = new C3 ();
+		c3.ApplyImpl (v1);
+	}
+}