Merge pull request #2877 from jruderman/letx

Chapter 3.3: Remove unused variable

Author: carols10cents

listings/ch03-common-programming-concepts/no-listing-20-blocks-are-expressions/src/main.rs

@@ -1,6 +1,4 @@
 fn main() {
-    let x = 5;
-
     let y = {
         let x = 3;
         x + 1