diff --git a/iced-tetris/tetris-logic/src/lib.rs b/iced-tetris/tetris-logic/src/lib.rs
index b5638ca..9ca80ac 100644
--- a/iced-tetris/tetris-logic/src/lib.rs
+++ b/iced-tetris/tetris-logic/src/lib.rs
@@ -10,7 +10,7 @@ pub struct BlockGrid {
 
 impl BlockGrid {
     pub fn new() -> BlockGrid {
-        let mut state = [[None; 20]; 10];
+        let state = [[None; 20]; 10];
         BlockGrid {
             state,
             active_piece: None,
@@ -23,7 +23,7 @@ impl BlockGrid {
 
     /// If it's impossible to drop a piece, return false
     pub fn drop_piece(&mut self, tetromino: Tetromino) -> bool {
-        if let None = self.active_piece {
+        if self.active_piece.is_none() {
             let piece = ActivePiece {
                 location: START_LOCATION,
                 tetromino,