Implement optimization where lambdas can be replaced by direct method-group they are wrapping. Fixes #10663

1 files changed, 42 insertions, 0 deletions

diff --git a/mcs/tests/gtest-lambda-31.cs b/mcs/tests/gtest-lambda-31.cs
new file mode 100644
index 00000000000..8836a96e00b
--- /dev/null
+++ b/mcs/tests/gtest-lambda-31.cs
@@ -0,0 +1,42 @@
+// Compiler options: -optimize
+
+// Check lambdas to method group optimization, no lambdas should be created for any code int this test
+
+using System;
+using System.Collections;
+using System.Linq;
+
+class Test
+{
+	static int Prop {
+		get {
+			return 4;
+		}
+	}
+
+	public static int Main ()
+	{
+		var parsed = from t in new[] { "2" } select int.Parse (t);
+		if (parsed.First () != 2)
+			return 1;
+
+		var s = new string[] { "x", "a" };
+		Array.Sort (s, (a, b) => String.Compare (a, b));
+		if (s[0] != "a")
+			return 10;
+
+		if (s[1] != "x")
+			return 11;
+
+		Func<int> i = () => Prop;
+		if (i () != 4)
+			return 20;
+
+		var em = new IEnumerable[] { new int[] { 1 } }.Select (l => l.Cast<int> ()).First ().First ();
+		if (em != 1)
+			return 30;
+
+		Console.WriteLine ("ok");
+		return 0;
+	}
+}
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