Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/errors/cs0019-70.cs

@@ -0,0 +1,21 @@
+// CS0019: Operator `&&' cannot be applied to operands of type `S?' and `S?'
+// Line: 20
+
+struct S
+{
+	public static S operator & (S s, S i)
+	{
+		return s;
+	}
+}
+
+class C
+{
+	public static void Main ()
+	{
+		S? s = new S ();
+		S? s2 = null;
+
+		var res = s && s2;
+	}
+}