refactor: rename directory

demo/rust/src/lib.rs

@@ -0,0 +1,28 @@
+fn hello() {
+    println!("Hello, world!");
+}
+
+#[cfg(test)]
+mod tests {
+    fn not_test() {}
+
+    #[test]
+    fn success() {
+        assert!(true);
+    }
+
+    #[test]
+    fn fail() {
+        assert!(false);
+    }
+
+    #[tokio::test]
+    async fn tokio_test_success() {
+        assert!(true);
+    }
+
+    #[tokio::test]
+    async fn tokio_test_fail() {
+        assert!(false);
+    }
+}