Imported Upstream version 5.10.0.47

Former-commit-id: d0813289fa2d35e1f8ed77530acb4fb1df441bc0

mcs/errors/cs8155.cs

@@ -0,0 +1,16 @@
+// CS8155: Lambda expressions that return by reference cannot be converted to expression trees
+// Line: 14
+
+using System.Linq.Expressions;
+
+class TestClass
+{
+    static int x;
+
+    delegate ref int D ();
+
+    static void Main ()
+    {
+        Expression<D> e = () => ref x;
+    }
+}