Imported Upstream version 5.10.0.47

Former-commit-id: d0813289fa2d35e1f8ed77530acb4fb1df441bc0

mcs/errors/cs8154.cs

@@ -0,0 +1,12 @@
+// CS8154: The body of `TestClass.TestFunction()' cannot be an iterator block because the method returns by reference
+// Line: 10
+
+class TestClass
+{
+    int x;
+
+    ref int TestFunction()
+    {
+        yield return x;
+    }
+}