minor styles

src/game.rs

@@ -136,8 +136,7 @@ impl Game {
         // It's possible that the player moved the piece in the meantime.
         if !self.playfield.can_active_piece_move_down() {
             let positions = self.playfield.lock_active_piece();
-            self.is_game_over =
-                self.is_game_over || positions.iter().all(|Position { x: _, y }| *y < 20);
+            self.is_game_over = self.is_game_over || positions.iter().map(|p| p.y).all(|y| y < 20);
 
             if self.clear_lines() > 0 {
                 self.playfield.active_piece = None;
@@ -227,9 +226,6 @@ impl Controllable for Game {
     }
 
     fn hold(&mut self) {
-        match self.playfield.try_swap_hold() {
-            Ok(_) => {}
-            Err(_) => (),
-        }
+        let _ = self.playfield.try_swap_hold();
     }
 }

src/srs.rs

@@ -1,5 +1,5 @@
-use crate::playfield::{Matrix, PlayField};
-use crate::tetromino::{Position, RotationState, Tetromino, TetrominoType};
+use crate::playfield::PlayField;
+use crate::tetromino::{Position, RotationState, TetrominoType};
 use std::collections::HashMap;
 
 pub trait RotationSystem {