simplify FutureMoves::get_board_from_idx

src/logic/future_moves.rs

@@ -357,17 +357,15 @@ impl FutureMoves {
     }
 
     fn get_board_from_idx(&self, idx: usize) -> Option<Board> {
-        if let Some(hist) = self.move_history(idx) {
+        self.move_history(idx).map(|hist| {
             let mut board = self.board;
             for (m, c) in hist {
                 if let Some(m) = m {
                     board.place(m, c).expect("move would not propegate");
                 }
             }
-            Some(board)
-        } else {
-            None
-        }
+            board
+        })
     }
 
     /// Return the best move which is a child of `self.current_root`