primitive_types6 solution

solutions/04_primitive_types/primitive_types6.rs

@@ -1 +1,16 @@
-// Solutions will be available before the stable release. Thank you for testing the beta version 🥰
+fn main() {
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn indexing_tuple() {
+        let numbers = (1, 2, 3);
+
+        // Tuple indexing syntax.
+        let second = numbers.1;
+
+        assert_eq!(second, 2, "This is not the 2nd number in the tuple!");
+    }
+}