Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/test-863.cs

@@ -0,0 +1,18 @@
+public class TestRefKeywords
+{
+	static int Main ()
+	{
+		int i = 0;
+		System.TypedReference r = __makeref(i);
+		System.Type t = __reftype(r);
+		int j = __refvalue( r,int);
+
+		__refvalue(r, int) = 4;
+		var x = ( __refvalue(r, int) += 1);
+
+		if (x != 5)
+			return 1;
+
+		return 0;
+	}
+}