update at 2020-09-10 18:04:49 by ehlxr

src/main.rs

@@ -568,7 +568,7 @@ fn main() {
     // println!("{:?}", bt);
 
     // ---------------------------
-    println!("---------------------------");
+    println!("------------if let 条件表达式---------------");
     let favorite_color: Option<&str> = None;
     let is_tuesday = false;
     let age: Result<u8, _> = "34".parse();