我在理解Monty Hall问题时遇到了麻烦，所以我把一些Rust放在一起。我有一个决定参与者是否赢得游戏节目的函数。如果他们赢得了比赛，那么函数返回true，否则返回false。我想测试非常大的数字，所以我在for循环中添加了一个Rayon并行迭代器。代码如下：

fn gameshow(num_doors: usize, num_runs: usize, change: bool) -> usize {
    let mut won_games:usize = 0;
    let runs: Vec<Vec<bool>> = vec![stagehand(num_doors); num_runs]; // Creates common solution 
    if change {
        ParallelIterator::for_each(IntoParallelIterator::into_par_iter(runs), |game| {
            let winner: bool = run_game_no_change(game); // Each door is chosen randomly when tested
            if winner { won_games += 1;}
        });
    }
    else {
        ParallelIterator::for_each(IntoParallelIterator::into_par_iter(runs), |game| {
            let winner: bool = run_game_no_change(game); // Each door is chosen randomly when tested
            if winner { won_games += 1;}
        });     
    }
    won_games   
}

在编译时，它会抛出“Cannot assign to won_games，as it is a captured variable in a Fn closure”错误。