Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/gtest-iter-19.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Linq;
+using System.Collections;
+using System.Collections.Generic;
+
+public static class IEnumerableTransform
+{
+
+	public static IEnumerable<TOut> Transform<TOut> (this IEnumerable<int> input, EmitterFunc<TOut> rule)
+	{
+		foreach (var v in input) {
+			TOut output;
+			rule (out output);
+			yield return output;
+		}
+	}
+
+	public static EmitterFunc<TOut> Emit<TOut> (TOut result)
+	{
+		return delegate (out TOut output) {
+			output = result;
+		};
+	}
+
+	public delegate void EmitterFunc<TOut> (out TOut output);
+
+	public static int Main ()
+	{
+		IEnumerable<int> arr = new int[3];
+		if (!arr.Transform<char> (IEnumerableTransform.Emit<char> ('t')).SequenceEqual(new char[] { 't', 't', 't'}))
+			return 1;
+
+		return 0;
+	}
+}