Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/gtest-iter-15.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+
+internal class C<TFirst>
+{
+	internal struct VSlot<T>
+	{
+		public readonly T Value;
+
+		public VSlot (T value)
+		{
+			Value = value;
+		}
+	}
+
+	internal IEnumerable<V> GetEnumerable<V> (IEnumerable<VSlot<V>> input)
+	{
+		foreach (var v in input)
+			yield return v.Value;
+	}
+}
+
+class C
+{
+	public static int Main ()
+	{
+		var c = new C<long> ();
+		string value = null;
+		foreach (var v in c.GetEnumerable (new[] { new C<long>.VSlot<string> ("foo") })) {
+			value = v;
+		}
+
+		if (value != "foo")
+			return 1;
+
+		return 0;
+	}
+}