Updated 'src/advanced_features/adv_types.md'.

projects/dst/src/main.rs

@@ -1,4 +1,6 @@
 fn main() {
-    let s1: str = "致以问候！";
-    let s2: str = "最近过得怎么样？";
+    let s1: &str = "致以问候！";
+    let s2: &str = "最近过得怎么样？";
+
+    println! ("{}, {}", s1.len(), s2.len());
 }

projects/never_type/src/main.rs

@@ -1,7 +1,10 @@
 fn main() {
     print! ("永永 ");
 
-    loop {
+    let res = loop {
         print! ("远远 ");
-    }
+        break
+    };
+
+    println! ("{res:?}");
 }

projects/type_aliases/src/main.rs

@@ -5,16 +5,4 @@ fn main() {
     let y: Kilometers = 5;
 
     assert_eq! (x, y);
-
-    type Thunk = Box<dyn Fn() + Send + 'static>;
-
-    let f: Thunk = Box::new(|| println! ("嗨"));
-
-    fn takes_long_type(f: Thunk) {
-        // --跳过代码--
-    }
-
-    fn returns_long_type() -> Thunk {
-        // --跳过代码--
-    }
 }