doc: Fix remove unused variable

This commit depends on #25148.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/doc/trpl/guessing-game.md b/src/doc/trpl/guessing-game.md
index 431b7dc50a2..586e36585d7 100644
--- a/src/doc/trpl/guessing-game.md
+++ b/src/doc/trpl/guessing-game.md
@@ -82,7 +82,7 @@ fn main() {
 
     let mut guess = String::new();
 
-    let input = io::stdin().read_line(&mut guess)
+    io::stdin().read_line(&mut guess)
         .ok()
         .expect("Failed to read line");