can someone help me debug this rust code getting random use errors

extern crate rand; //use rand::prelude::*; //use random::Source; use rand::Rng; pub struct Game { players : Vec, places : [i32; 6], purses : [i32; 6], in_penaltybox : [bool; 6], current_player : i32, is_getting_out_of_penaltybox : bool, pop_questions : Vec, science_questions : Vec, sports_questions : Vec, rock_questions : Vec, } impl Default for Game { fn default() -> Game { let mut game = Game { players : vec![], places : [0;6], purses : [0;6], in_penaltybox : [false;6], current_player : 0, is_getting_out_of_penaltybox : false, pop_questions : Vec::new(), science_questions : Vec::new(), sports_questions : Vec::new(), rock_questions : Vec::new(), }; for x in 0..50 { let pop_qu = "Pop Question ".to_string() + &x.to_string(); game.pop_questions.push(pop_qu); let sci_qu = "Science Question ".to_string() + &x.to_string(); game.science_questions.push(sci_qu); let spo_qu = "Sports Question ".to_string() + &x.to_string(); game.sports_questions.push(spo_qu); let rock_qu = game.create_rock_question(x); game.rock_questions.push(rock_qu); } game } } impl Game { fn how_many_players(&self) -> usize { self.players.len() } fn is_playable(&self) -> bool { self.how_many_players() >= 2 } fn did_player_win(&self) -> bool { !(self.purses[self.current_player as usize] == 6) } fn current_category(&self) -> &'static str { match self.places[self.current_player as usize] { 0 | 4 | 8 => return "Pop", 1 | 5 | 9 => return "Science", 2 | 6 | 10 => return "Sports", _ => return "Rock" } } fn create_rock_question(&self,index: i32) -> String { "Rock Question ".to_string() + &index.to_string() } fn add(&mut self,player_name: String) -> bool { let l_player = player_name.clone(); self.players.push(player_name); self.places[self.how_many_players()] = 0; self.purses[self.how_many_players()] = 0; self.in_penaltybox[self.how_many_players()] = false; println!("{} was added",l_player); println!("They are player number {}",self.players.len()); true } fn wrong_answer(&mut self) -> bool { println!("Question was incorrectly answered"); println!("{} was sent to the penalty box",self.players[self.current_player as usize]); self.in_penaltybox[self.current_player as usize] = true; self.current_player += 1; if self.current_player == self.players.len() as i32 { self.current_player = 0; } true } } impl Game { fn ask_question(&mut self) { match self.current_category() { "Pop" => { let top = self.pop_questions.pop(); println!("{:?}",top.unwrap()); }, "Science" => { let top = self.science_questions.pop(); println!("{:?}",top.unwrap()); }, "Sports" => { let top = self.sports_questions.pop(); println!("{:?}",top.unwrap()); }, "Rock" => { let top = self.rock_questions.pop(); println!("{:?}",top.unwrap()); }, _ => { println!("Unexpected case"); } } } } impl Game { fn roll(&mut self,roll: i32) { println!("{} is current player",self.players[self.current_player as usize]); println!("They have rolled a {}",roll); if self.in_penaltybox[self.current_player as usize] { if roll % 2 != 0 { self.is_getting_out_of_penaltybox = true; println!("{} is getting out of the penalty box",self.players[self.current_player as usize]); self.places[self.current_player as usize] += roll; if self.places[self.current_player as usize] > 11 { self.places[self.current_player as usize] -= 12; } println!("{0} 's new location is {1}",self.players[self.current_player as usize],self.places[self.current_player as usize]); println!("The category is {}",self.current_category()); self.ask_question(); } else { println!("{} is not getting out of the penalty box",self.players[self.current_player as usize]); self.is_getting_out_of_penaltybox = false; } } else { self.places[self.current_player as usize] += roll; if self.places[self.current_player as usize] > 11 { self.places[self.current_player as usize] -= 12; } println!("{0} 's new location is {1}",self.players[self.current_player as usize],self.places[self.current_player as usize]); println!("The category is {}",self.current_category()); self.ask_question(); } } } impl Game { fn was_correctly_answered(&mut self) -> bool { if self.in_penaltybox[self.current_player as usize] { if self.is_getting_out_of_penaltybox { println!("Answer was correct!!!!"); self.purses[self.current_player as usize] += 1; println!("{0} now has {1} Gold Coins.",self.players[self.current_player as usize],self.purses[self.current_player as usize]); let winner: bool = self.did_player_win(); self.current_player += 1; if self.current_player == self.players.len() as i32 { self.current_player = 0; } winner } else { self.current_player += 1; if self.current_player == self.players.len() as i32 { self.current_player = 0; } true } } else { println!("Answer was correct!!!!"); self.purses[self.current_player as usize] += 1; println!("{0} now has {1} Gold Coins.",self.players[self.current_player as usize],self.purses[self.current_player as usize]); let winner: bool = self.did_player_win(); self.current_player += 1; if self.current_player == self.players.len() as i32 { self.current_player = 0; } winner } } } fn main() { let mut rng = rand::IsaacRng::new_unseeded(); println!("{}", rng.gen_range(0, 10)); //rand::thread_rng(); let mut not_a_winner : bool = false; let mut game = Game {..Default::default()}; game.add("Chet".to_string()); game.add("Pat".to_string()); game.add("Sue".to_string()); while { game.roll( rand::Rng::() % 5 + 1); if rand::Rng::() % 9 == 7 { not_a_winner = game.wrong_answer(); } else { not_a_winner = game.was_correctly_answered(); } not_a_winner != false {} } }

https://repl.it/@jmitch27/CrispDramaticWearables