First commit

exercises/06_move_semantics/move_semantics4.rs

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+fn main() {
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    // TODO: Fix the compiler errors only by reordering the lines in the test.
+    // Don't add, change or remove any line.
+    #[test]
+    fn move_semantics4() {
+        let mut x = Vec::new();
+        let y = &mut x;
+        y.push(42);
+        let z = &mut x;
+        z.push(13);
+        assert_eq!(x, [42, 13]);
+    }
+}